CN1673585A - Plastic stop valve - Google Patents

Abstract

The utility model provides a plastics stop valve, has valve gap, valve clack, valve rod and plastics valve body, the valve rod passes the valve gap and is connected with the valve clack, is provided with the disk seat in the plastics valve body, the disk seat has the disk seat opening, the disk seat opening is relative with the valve clack that is located the valve rod bottom, the both ends of plastics valve body have respectively with the valve body influent stream mouth and the valve body outfall that the disk seat opening is linked together, the top of plastics valve body has the valve gap connector, characterized by valve gap connector and valve gap have mutually supporting constitute by plastic material and the plastics face of bonding each other, the plastics face of bonding of valve gap connector with the plastics face of bonding of valve gap bonds each other.

Description

Plastic stop valve

Technical field

The present invention relates to a kind of plastic stop valve.

Background technique

Existing have the not advantage of polluted source with the matching used plastic stop valve in TPO plastic water supply pipe road.This plastic stop valve has plastics valve body, valve rod, flap and valve gap, on valve gap, be provided with stuffing box and Stem Mut, be provided with at the sidewall of valve gap and be used for the outside thread that is connected with the plastics valve body, on the plastics valve body, be provided with inflow port, go out head piece and valve seat, the plastics valve body is embedded with the ring-type copper insert when molding and forming, be provided with internal thread at the inner wall of ring body of ring-type copper insert.During plastic stop valve, the valve gap that valve rod and flap normally will be installed screws in ring-type copper insert on the plastics valve body in assembling, and then realizes being connected of valve gap and plastics valve body.In assembly process, flap need pass the inner chamber of ring-type copper insert on the plastics valve body and the plastics valve body of packing into, so the path of the internal thread of ring-type copper insert must be greater than flap.With regard to this existing product, valve gap connection mouth on the plastics valve body is actually the metal connection mouth that is served as by the ring-type copper insert, simultaneously, ring-type copper insert on the plastics valve body is that the link as plastics valve body and valve gap uses, and has promptly constituted head cover engaging structure jointly by internal thread on the ring-type copper insert and the outside thread on the valve gap.Because adopt thread connecting mode between copper insert on the plastics valve body and the valve gap, this Placement is dismountable.When flap occurred damaging after long-term the use, the user just can unload valve gap from the plastics valve body, flap is changed and keeped in repair.But the problem that causes thus is: the latus rectum of plastic stop valve is big more, and the diameter of flap is big more, and the bore of copper insert and volume are also big more on the valve body, and the metal valve gap is also big more, and copper consumption is many more.Because the copper valency is far above the price of plastics, so in the manufacture cost of the bigger plastic stop valve of existing latus rectum, the cost of copper has accounted for very big proportion (generally account for overall cost 70%), the latus rectum of plastic stop valve is big more, and the cost proportion of copper is high more.That is to say that " flap is changed and keeped in repair " this function is to be that cost obtains with bigger manufacture cost.Studies show that in the actual using process of plastic stop valve, the ratio of user's replacing and maintenance flap is little, some users then do not have to change and keep in repair the needs of flap at all.For these users, this function that can change and keep in repair flap performs practically no function, and has caused waste thus.In addition, the plastics valve body of existing plastic stop valve is molding and forming, be subjected to the restriction of the injection mould die sinking and the demoulding, near valve seat Flow area is less, seriously influenced the conveyance capacity of stop valve, for this reason, China's utility model patent discloses a kind of plastic stop valve No. 02221595.6, this stop valve especially in valve seat bottom right runner lower wall be provided with the downward reentrant part that is lower than inflow port runner lower wall, simultaneously, for the ease of the demoulding when the injection-moulded plastic valve body, allow the bottom of this reentrant part constitute by the back cover lid that connects as one with the amalgamation of plastics valve body.Though this product can enlarge markedly the Flow area of stop valve, and make the plastics valve body still can adopt the plastic mould injection moulding to make,, this scheme is carried out the amalgamation connection after allowing a plastics valve body divide post forming again, has strengthened the difficulty of making.Therefore, above-mentioned existing product still awaits improving.

Summary of the invention

The objective of the invention is the head cover engaging structure of above-mentioned existing product is improved, a kind of plastic stop valve that especially is suitable for being made into the larger caliber product is provided.

Plastic stop valve of the present invention has valve gap, flap, valve rod and plastics valve body, described valve rod passes valve gap and is connected with flap, in the plastics valve body, be provided with valve seat, described valve seat has the valve seat opening, described valve seat opening is relative with the flap that is positioned at stem bottom, described plastics two ends of valve body has the valve body inflow port and the valve body that are connected with the valve seat opening respectively and goes out head piece, the top of described plastics valve body has the valve gap connection mouth, it is characterized in that described valve gap connection mouth and valve gap have being constituted and be used for mutually bonding plastic bonding face by plastic materials of cooperatively interacting, the plastic bonding face of described valve gap connection mouth and the plastic bonding face of described valve gap are bonding mutually.

In plastic stop valve of the present invention, the plastic bonding face of the plastic bonding face of valve gap and valve gap connection mouth can be one of following three kinds of modes or its combination: the plastic bonding face of (1), valve gap is the outer side surface of valve gap, and the plastic bonding face of valve gap connection mouth is the inner side surface of this valve gap connection mouth; (2), the plastic bonding face of valve gap connection mouth is the outer side surface of this valve gap connection mouth, the valve gap inner side surface of the plastic bonding face of valve gap for matching with the outer side surface of this valve gap connection mouth; (3), the plastic bonding face of valve gap connection mouth is the end face of valve gap connection mouth, the plastic bonding face of valve gap is the wall that matches with this valve gap connection mouth end face of valve gap.

In the present invention, the plastic bonding face of above-mentioned valve gap connection mouth and valve gap can mode bonding by tackiness agent or hot melt adhesion be realized the connection between the two.When the mode with hot melt adhesion realizes connection between the two, can allow the plastic bonding face of above-mentioned valve gap connection mouth and valve gap constitute by polyolefine material.Simultaneously,, can adopt common electrical heating elements to realize hot melt adhesion, also can adopt ultrasound to realize hot melt adhesion if adopt the hot melt adhesion mode.When carrying out hot melt adhesion, can adopt the hot melt dock bonding or the thermofusible spigot formula is bonding.From guaranteeing that product considers in the angle of the barrier performance of adhesive portion, the mode with thermofusible spigot of herein recommending makes the plastic bonding face of the plastic bonding face of valve gap and described valve gap connection mouth bonding mutually.

In plastic stop valve of the present invention, described valve gap can be the integral type valve gap that is made of single parts, but, described valve gap also can be by the valve gap inner core and the combined type valve gap that constitutes jointly of the inner core fixed block that cooperates with it, in the case, the plastic bonding face that is made of plastic materials of above-mentioned valve gap is positioned on the inner core fixed block.Herein, said inner core fixed block can be by directly fixedlying connected with the valve gap inner core mode (as adopting link such as screw fixedly connected) realize fixing to the valve gap inner core, also can realize fixing by mode such as the valve gap inner core being nested with or pressured to the valve gap inner core.

In the present invention, said plastics valve body is actually a kind of valve body of producing based on plastic materials, it both can be a kind of valve body of being made by pure plastic materials, but also can be the valve body (as be provided with metal frame in plastic basis material) that different materials is composited.For the latter, should make by plastic materials in the plastic bonding face portion of valve gap connection mouth at least.In like manner, for valve gap, it also can be to be composited by different materials, but it should be made by plastic materials in the facial position of the plastic bonding of valve gap at least.In plastic stop valve of the present invention, the material of making the plastics valve body can adopt to be convenient to be connected and avirulent polyolefine material with plastic pipe, this polyolefine material can be a polythene material, it also can be polypropylene material, it can also be polybutylene material or the like, certainly, where necessary, also can in above-mentioned polyene material, add additives such as bulking agent, dyestuff in right amount.That is to say that the said polyolefins material described in the present invention is not that to refer in particular to purity be 100% polyolefine material.

In the present invention, because valve gap no longer is connected with copper insert in the valve body with the form that is threaded, valve gap and valve gap connection mouth just no longer are constrained to circle, be that they can be made into other the non-circular shape that cooperatively interacts, this just provides brand-new space for the design of plastic stop valve.For example, if allow internal face lower edge that valve body goes out head piece one side to the distance of the valve rod axis of plastic stop valve that is positioned at of valve gap connection mouth be the internal face lower edge that is positioned at valve body inflow port one side of this connection mouth 1.4～4.0 times to the distance of valve rod axis, just can increase the inflow-rate of water turbine in valve seat adjacent portion bit stream road significantly, the corresponding runner performance of improving plastic stop valve.In this case, even the downward reentrant part (this downward reentrant part also still can be set certainly) that is lower than inflow port runner lower wall is set in the runner not below valve seat, this product also can obtain bigger inflow-rate of water turbine, carry out the amalgamation connection again after can avoiding allowing the plastics valve body divide post forming thus, make the manufacturing of valve body more easy.Calculate through reality, when internal face lower edge that valve body goes out head piece one side to the distance of the valve rod axis of plastic stop valve that is positioned at that makes the valve gap connection mouth is that the internal face lower edge that is positioned at valve body inflow port one side of this connection mouth is during to 1.6～3.8 times of the distance of valve rod axis, just can reach preferable overcurrent effect, and the design of valve body and make all more or less freely.

For the ease of the making larger caliber, and the area of passage of runner is enough big, the better plastic stop valve of overall performance of product, matches with above-mentioned improvement project, further improves below product of the present invention also can be done:

The lower wall setting of the runner below valve seat is lower than the downward reentrant part of inflow port runner lower wall, to increase the runner area of passage at the contiguous position of valve seat, guarantees that plastic stop valve possesses enough inflow-rate of water turbines.In addition, for the ease of the processing of product, can allow the bottom of downward reentrant part constitute by the back cover lid that connects as one with the amalgamation of plastics valve body.The peripheral side wall that can allow described back cover cover usually matches to merge with the madial wall of the downward reentrant part of described plastics valve body and fixedlys connected, and this fixedly connected tackiness agent that can adopt is bonding, also can adopt hot melt adhesion, but is good with hot melt adhesion especially.

In addition, in the present invention, the inflow port of valve body and go out that head piece can be respectively the flange join type inflow port and flange join type goes out head piece also can be respectively inwall and go out head piece by thermofusible spigot formula inflow port and the thermofusible spigot formula that plastic materials constitutes.When the thermofusible spigot formula inflow port that adopts inwall to be made of plastic materials and thermofusible spigot formula went out head piece, the inwall that can also be respectively goes out head piece in thermofusible spigot formula inflow port and thermofusible spigot formula was provided with electric heating wire, so that the construction and installation of product.

Compared with the aforementioned existing similar products, the present invention improves the structure of plastic stop valve, by making valve gap and valve gap connection mouth bonding mutually, replaced the form that is threaded between the copper insert in the valve gap and valve body in the existing method, this not only can significantly reduce the Cuprum alloy in the plastic stop valve or the consumption of other metallic material that is difficult for corrosion, and can make valve body more tight with being connected of valve gap, the sealing of connection part is also more reliable, more cleaning.Simultaneously, valve gap no longer with the form that is threaded with after valve body is connected, the connection mouth at valve gap and valve body top just no longer is constrained to circle, and the design that should be plastic stop valve mutually provides new space, helps improving the overall performance of plastic stop valve.Need to prove, do not adopt copper insert as link after, though improvement of the present invention can increase the consumption of plastic materials,, thereby can reduce the manufacture cost of plastic stop valve significantly because the price of plastic materials is difficult for the price of the metallic material of corrosion far below copper etc.In addition, take after the bonding way between valve gap and the valve body, valve gap can not unload from valve body again, the corresponding replacing that can not realize after flap damages.But precedingly address, it is little that the plastic stop valve user changes the ratio of flap voluntarily, but the benefit that cost of goods manufactured reduces significantly is significantly, and therefore improvement of the present invention has improved cost performance of product greatly.So the product that adopts the inventive method to make has inexpensive, reliable characteristics, can select for use for the user who need not to change and keep in repair flap.What also need particularly point out is: nearest result of study shows, at the valve seat that adopts TPO plastic production plastics valve body, when adopting the copper alloy made flap, JB/T8859--2004 standard (stop valve static pressure test rules) according to the People's Republic of China (PRC) is tested, when the switch number of times of plastic stop valve reaches more than 15,000 times, plastic stop valve still can normally use and not have leakage, and the product of making by this technological scheme has reached the user to the valve fitness for purpose in working life.Simultaneously, can rubber mount be set at the position that contacts with valve seat of flap, and directly allow the position that contacts with valve seat of flap make by Cu alloy material, the corresponding disadvantage that is easy to occur in many existing products such as cushion joint seepage, the cushion that rubber mount brings comes off, cushion warpage because of being provided with on flap can avoided is effectively removed when above-mentioned disadvantage occurring dismounting and maintenance to plastic stop valve from.That is to say, do not dismantled necessity that valve gap keeps in repair in the practice.In addition, the given product of the present invention can avoid the stress that produces because of valve body connection mouth and being connected of valve gap to concentrate (this stress is concentrated to form the working life of valve and threatened), this problem that also to be existing valve body of plastic cut-off valve be difficult to basic solution with other linkage structure of valve gap.Technological scheme of the present invention also especially is suitable for adopting when making the plastic stop valve of larger caliber.

Content of the present invention further illustrates with the following Examples, but content of the present invention is not limited only to content related among the embodiment.

Description of drawings

Fig. 1 is the connection procedure schematic representation of valve body and valve gap among the embodiment 1.

Fig. 2 is a plastic stop valve structural representation after embodiment's 1 connection is finished.

Fig. 3 is the A--A sectional view of Fig. 2.

Fig. 4 is the valve body structure schematic representation of plastic stop valve among Fig. 1.

Fig. 5 is the plan view of Fig. 4.

Fig. 6 is the Placement schematic representation of valve body and valve gap among the embodiment 2.

Fig. 7 is the Placement schematic representation of valve body and valve gap among the embodiment 3.

Fig. 8 is a plastic stop valve structural representation after connection is finished among the embodiment 3.

Fig. 9 is the Placement schematic representation of valve body and valve gap among the embodiment 4.

Figure 10 is a plastic stop valve structural representation after connection is finished among the embodiment 4.

Figure 11 is the B--B sectional drawing of Figure 10.

Figure 12 is the C--C sectional drawing of Figure 10.

Figure 13 is the plastic valve body structure schematic representation of plastic stop valve among Figure 10.

Figure 14 is the plan view of Figure 13.

Figure 15 is the inner core anchor structure schematic representation of plastic stop valve among Figure 10.

Figure 16 is the valve gap core arrangement schematic representation of plastic stop valve among Figure 10.

Figure 17 is the plan view of Figure 16.

Figure 18 is the connection procedure schematic representation of valve body and valve gap among the embodiment 5.

Figure 19 is a plastic stop valve structural representation after embodiment's 5 connections are finished.

Embodiment

Embodiment 1: shown in Fig. 1～5, plastic stop valve in the present embodiment has valve gap 1, flap 12, valve rod 10 and plastics valve body 3, described valve rod 10 passes valve gap 1 and is connected with flap 12, in plastics valve body 3, be provided with valve seat 20, described valve seat 20 has valve seat opening 23, described valve seat opening 23 is relative with the flap 12 that is positioned at stem bottom, the two ends of described plastics valve body 3 have the valve body inflow port 17 and the valve body that are connected with valve seat opening 23 respectively and go out head piece 13, the top of described plastics valve body 3 has valve gap connection mouth 2, it is characterized in that described valve gap connection mouth 2 and valve gap 1 have being constituted and be used for mutually bonding plastic bonding face by plastic materials of cooperatively interacting, the plastic bonding face of the plastic bonding face of described valve gap connection mouth 2 and described valve gap 1 is bonding mutually.

In the present embodiment, the plastic bonding face of valve gap connection mouth 2 is the inner side surface 5 of this valve gap connection mouth, and the plastic bonding face of described valve gap is the outer side surface 4 of valve gap.

The mutually bonding plastic bonding face that is used for of above-mentioned valve gap connection mouth in the present embodiment and valve gap is the plastic bonding face of hot melt adhesion, the plastic bonding face of described valve gap connection mouth and the mutual hot melt adhesion of the plastic bonding face of described valve gap mutually.Herein, the plastic bonding face of the plastic bonding face of above-mentioned valve gap connection mouth and valve gap constitutes by polyolefine material.

In addition, in the plastic stop valve of present embodiment, internal face lower edge that valve body goes out head piece 13 1 sides to the distance c of the valve rod axis 11 of plastic stop valve that is arranged in of valve gap connection mouth 2 is the internal face lower edge that is positioned at valve body inflow port 17 1 sides of this valve gap connection mouth 3.0 times (this example c is 7.5cm, and b is 2.5cm) apart from d to valve rod axis 11.This kind structural type can increase the inflow-rate of water turbine in valve seat adjacent portion bit stream road significantly, the corresponding runner performance of having improved plastic stop valve.Certainly, where necessary, also can revise the numerical value of above-mentioned distance c, d, be 5.0cm as c, and b is 2.5m (c is 2 times of d), or c is 9.0cm, and b is 2.5m (c is 3.6 times of d).

For the ease of with being connected of plastic pipe, in the present embodiment, the valve body inflow port 17 of described plastics valve body and valve body go out head piece 13 and are respectively inwall and go out head piece by thermofusible spigot formula inflow port and the thermofusible spigot formula that plastic materials constitutes.Certainly, with regard to the present invention, the valve body inflow port 17 of plastics valve body and valve body go out head piece 13 and not only are limited to the form that adopts thermofusible spigot formula inflow port and thermofusible spigot formula to go out head piece, also can adopt the structural type of be threaded mouth and flange connection mouth respectively as the two.

In addition, present embodiment also on the inwall of above-mentioned thermofusible spigot formula inflow port and the thermofusible spigot formula go out on the inwall of head piece to be respectively arranged with electric heating wire 18,19.

In the present embodiment, the material of making the plastics valve body is a polyolefine material, and the polyolefine material that is adopted in this example is a polythene material.Described valve gap connection mouth and valve gap can be bonding mutually plastic bonding face constitute by the plastic materials of hot melt adhesion mutually.

Embodiment 2: the plastic stop valve of present embodiment is similar to embodiment 1, different is that in the present embodiment, the plastic bonding face of valve gap connection mouth 2 is the end face 8 of valve gap connection mouth, the plastic bonding face of valve gap 1 is the wall 9 that matches with this valve gap connection mouth end face 8 of valve gap, as shown in Figure 6.

Embodiment 3: the plastic stop valve of present embodiment is similar to embodiment 1, different is, in the present embodiment, the plastic bonding face of valve gap connection mouth is the outer side surface 7 of this valve gap connection mouth, the valve gap inner side surface 6 of the plastic bonding face of valve gap for matching with the outer side surface 7 of this valve gap connection mouth is shown in Fig. 7,8.In addition, present embodiment not on the inwall of thermofusible spigot formula inflow port and the thermofusible spigot formula go out on the inwall of head piece electric heating wire is set respectively, this point is also different with embodiment 1.

Embodiment 4: shown in Fig. 9～17, plastic stop valve in the present embodiment still has valve gap 1, flap 12, valve rod 10 and plastics valve body 3, described valve rod 10 passes valve gap 1 and is connected with flap 12, in plastics valve body 3, be provided with valve seat 20, described valve seat 20 has valve seat opening 23, described valve seat opening 23 is relative with the flap 12 that is positioned at stem bottom, the two ends of described plastics valve body 3 have the valve body inflow port 17 and the valve body that are connected with valve seat opening 23 respectively and go out head piece 13, the top of described plastics valve body 3 has valve gap connection mouth 2, it is characterized in that described valve gap connection mouth 2 and valve gap 1 have being made of and can bonding mutually plastic bonding face plastic materials of cooperatively interacting, the plastic bonding face of the plastic bonding face of described valve gap connection mouth 2 and described valve gap 1 is bonding mutually.

In the present embodiment, described valve gap is by valve gap inner core 14 and the combined type valve gap that constitutes jointly of the inner core fixed block 15 that cooperates with it, and the plastic bonding face of described valve gap is positioned on the inner core fixed block 15.

Herein, inner core fixed block 15 is realized fixing the valve gap inner core by the mode that valve gap inner core 14 is withheld.In the present embodiment, the plastic bonding face of valve gap connection mouth 2 is the outer side surface 7 of this connection mouth, the inner core fixed block inner side surface 16 of the plastic bonding face of inner core fixed block 15 for matching with the outer side surface of this connection mouth.When practical set, can earlier valve gap inner core 14 be inserted valve gap connection mouth 2, allow inner core fixed block 15 be connected again with valve gap connection mouth 2 thermofusible spigots.After connection was finished, inner core fixed block 15 was just withheld on valve gap inner core 14.

In order to increase the inflow-rate of water turbine of plastic stop valve, be provided with the downward reentrant part 21 that is lower than inflow port 17 runner lower walls in the runner of described plastics valve body 3 below valve seat 20 in the present embodiment.

For the ease of making the plastics valve body, present embodiment allows the bottom of above-mentioned downward reentrant part 21 be made of the back cover lid 22 that connects as one with 3 amalgamations of plastics valve body.

With regard to the present invention, also can inner core fixed block 15 directly be fixedlyed connected with valve gap inner core 14 to the fit system change of inner core fixed block 15 in the present embodiment and valve gap inner core 14.Certainly, also can make the inner side surface of the plastic bonding face of valve gap connection mouth 2 for this connection mouth, make the outer side surface of the plastic bonding face of inner core fixed block 15 for this inner core fixed block, at this moment, can allow the combined type valve gap that constitutes jointly by valve gap inner core 14 and inner core fixed block be nested with within the valve gap connection mouth.In addition, can also allow the plastic bonding face of valve gap connection mouth 2 be the end face of valve gap connection mouth, allow the plastic bonding face of inner core fixed block 15 be the wall that matches with this valve gap connection mouth end face of inner core fixed block 15.

Embodiment 5: as Figure 18, shown in 19, plastic stop valve in the present embodiment has valve gap 1, flap 12, valve rod 10 and plastics valve body 3, described valve rod 10 passes valve gap 1 and is connected with flap 12, in plastics valve body 3, be provided with valve seat 20, described valve seat 20 has valve seat opening 23, described valve seat opening 23 is relative with the flap 12 that is positioned at stem bottom, the two ends of described plastics valve body 3 have the valve body inflow port 17 and the valve body that are connected with valve seat opening 23 respectively and go out head piece 13, the top of described plastics valve body 3 has valve gap connection mouth 2, it is characterized in that described valve gap connection mouth 2 and valve gap 1 have being made of and can bonding mutually plastic bonding face plastic materials of cooperatively interacting, the plastic bonding face of the plastic bonding face of described valve gap connection mouth 2 and described valve gap 1 is bonding mutually.

In the present embodiment, the plastic bonding face of valve gap connection mouth 2 is the inner side surface 5 of this valve gap connection mouth, and the plastic bonding face of described valve gap 1 is the outer side surface 4 of valve gap, and this point and embodiment 1 are similar.

In addition, be used to realize the sealing material (as oil immersion asbestos packing, elastic sealing ring or Expanded graphite etc.) that seals between valve gap and the valve rod for the ease of changing and safeguarding, the plastic stop valve valve gap of present embodiment is provided with the stuffing box external member, described stuffing box external member comprises the stuffing box housing and is included in the interior sealing material 25 of stuffing box housing, described valve rod 10 passes the stuffing box external member and contacts with sealing material 25 in being included in the stuffing box housing, and described stuffing box housing is fixed on the valve gap 1 through linkage structure.

With regard to the present invention, the above-mentioned linkage structure that the stuffing box housing is fixed on the valve gap can be multiple structural type, as common screw connection structure, flanged connecting structure, link (as screw or connection clamp) linkage structure or the like.Because above-mentioned linkage structure is demountable, in the process of using plastic stop valve, when safeguarding and when changing, just can directly the stuffing box housing be unloaded from valve gap, and need not whole valve gap is unloaded from the plastics valve body to the sealing material in the stuffing box housing.Herein, the sealing material in the stuffing box housing still can adopt existing various sealing material, as oil immersion asbestos packing, elastic sealing ring or Expanded graphite or the like.

In the present embodiment, the above-mentioned linkage structure that the stuffing box housing is fixed on the valve gap 1 is connected screw with stuffing box external member on being arranged at valve gap and constitutes by being arranged at outside thread on the stuffing box housing outer wall, and the internal thread that described stuffing box external member connects in the screw matches with outside thread on the stuffing box housing outer wall.

In this example, above-mentioned stuffing box housing is had through hole by the bottom filler accommodation box 24 constitutes with the lid 26 that has through hole, described filler accommodation box 24 is threaded with lid 26, described valve rod 10 passes the through hole offered lid 26 and filler accommodation box bottom and contacts with sealing material 25 in being included in the stuffing box housing, and the outside thread on the described stuffing box housing outer wall is arranged on the outer wall of filler accommodation box 24.

In the present embodiment, above-mentioned valve gap 1 is installed the plastics valve gap of inserts 27 for being embedded with stuffing box, and described stuffing box external member is installed in this stuffing box and installs on the inserts 27.Above-mentioned stuffing box external member in this example connects screw and is opened on the stuffing box installation inserts 27.

Claims (14)

1, a kind of plastic stop valve, has valve gap, flap, valve rod and plastics valve body, described valve rod passes valve gap and is connected with flap, in the plastics valve body, be provided with valve seat, described valve seat has the valve seat opening, described valve seat opening is relative with the flap that is positioned at stem bottom, described plastics two ends of valve body has the valve body inflow port and the valve body that are connected with the valve seat opening respectively and goes out head piece, the top of described plastics valve body has the valve gap connection mouth, it is characterized in that described valve gap connection mouth and valve gap have being constituted and be used for mutually bonding plastic bonding face by plastic materials of cooperatively interacting, the plastic bonding face of described valve gap connection mouth and the plastic bonding face of described valve gap are bonding mutually.

2, plastic stop valve as claimed in claim 1 is characterized in that the inner side surface of the plastic bonding face of described valve gap connection mouth for this valve gap connection mouth, and the plastic bonding face of described valve gap is the outer side surface of valve gap.

3, plastic stop valve as claimed in claim 1 is characterized in that the outer side surface of the plastic bonding face of described valve gap connection mouth for this valve gap connection mouth, the valve gap inner side surface of the plastic bonding face of described valve gap for matching with the outer side surface of this valve gap connection mouth.

4, plastic stop valve as claimed in claim 1, the plastic bonding face that it is characterized in that described valve gap connection mouth is the end face of valve gap connection mouth, the plastic bonding face of described valve gap is the wall that matches with this valve gap connection mouth end face of valve gap.

5, plastic stop valve as claimed in claim 1 is characterized in that described valve gap is by the valve gap inner core and the combined type valve gap that constitutes jointly of the inner core fixed block that cooperates with it, and the plastic bonding face of described valve gap is positioned on the inner core fixed block.

6, plastic stop valve as claimed in claim 1 is characterized in that internal face lower edge that valve body goes out head piece one side to the distance of the valve rod axis of plastic stop valve that is positioned at of described valve gap connection mouth is to the distance of valve rod axis 1.4～4.0 times of the internal face lower edge that is positioned at valve body inflow port one side of this valve gap connection mouth.

7, plastic stop valve as claimed in claim 1 is characterized in that the valve body inflow port of described plastics valve body and valve body go out head piece and be respectively inwall and go out head piece by thermofusible spigot formula inflow port and the thermofusible spigot formula that plastic materials constitutes.

8, plastic stop valve as claimed in claim 7, it is characterized in that on the inwall of thermofusible spigot formula inflow port and the thermofusible spigot formula go out on the inwall of head piece to be respectively arranged with electric heating wire.

9, plastic stop valve as claimed in claim 1 is characterized in that being provided with the downward reentrant part that is lower than inflow port runner lower wall in the runner of described plastics valve body below valve seat.

10, plastic stop valve as claimed in claim 9, the bottom that it is characterized in that described downward reentrant part is made of the back cover lid that connects as one with the amalgamation of plastics valve body.

11, plastic stop valve as claimed in claim 1 is characterized in that the mutually bonding plastic bonding face that is used for of described valve gap connection mouth and valve gap is made of the plastic materials of hot melt adhesion mutually.

12, plastic stop valve as claimed in claim 1 is characterized in that the plastic bonding face of described valve gap connection mouth and the plastic bonding face of valve gap constitute by polyolefine material.

13, plastic stop valve as claimed in claim 1, it is characterized in that valve gap is provided with the stuffing box external member, described stuffing box external member comprises the stuffing box housing and is included in the interior sealing material of stuffing box housing, described valve rod passes the stuffing box external member and contacts with sealing material in being included in the stuffing box housing, and described stuffing box housing is fixed on the valve gap through linkage structure.

14, plastic stop valve as claimed in claim 13 is characterized in that described valve gap is to be embedded with the plastics valve gap that stuffing box is installed inserts, and described stuffing box external member is installed in this stuffing box and installs on the inserts.

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