CN202280884U

CN202280884U - Stop-check valve

Info

Publication number: CN202280884U
Application number: CN2011203184742U
Authority: CN
Inventors: 荆国政; 朱庭浩; 徐胡清
Original assignee: JIANGSU HEHAI NEW ENERGY CO Ltd
Current assignee: Jiangsu He Hai new forms of energy limited company
Priority date: 2011-08-29
Filing date: 2011-08-29
Publication date: 2012-06-20
Anticipated expiration: 2021-08-29

Abstract

The utility model relates to a pipeline valve, in particular to a stop-check valve with stopping and checking functions. The stop-check valve comprises a valve body and a valve seat, wherein the valve body is provided with an inlet cavity and an outlet cavity; the valve seat is arranged between the inlet cavity and the outlet cavity; a valve cover and a valve rod are arranged above the valve body; and the lower end of the valve rod enters the valve body after passing through the valve cover, and the upper end of the valve rod is arranged outside the valve cover after passing through the valve cover. The stop-check valve is characterized in that the lower end of the valve rod is provided with a valve core, an elastic element is arranged between the valve core and the valve rod, and the valve core is arranged above the valve seat and matched with the valve seat. The mounting expense and spactial position can be reduced by using the stop-check valve when the stop-check valve is used on a pipeline simultaneously requiring a stop valve and a check valve or an occasion where a mounting position is limited by space; one stop-check valve replaces one stop valve and one check valve, thus, the investment for a valve is reduced; meanwhile, compared with a common check valve, the stop-check valve has small resistance and low water hammer pressure due to the arrangement of a spring.

Description

A kind of screw down nonreturn valve

Technical field

The utility model relates to a kind of pipeline valve, is specifically related to a kind of screw down nonreturn valve with non-return and restraining double action, and it is widely used on the pipeline of various operating modes such as oil, chemical industry, pharmacy, power industry.

Background technique

Stop valve is meant the valve that closure member moves along the centre line.Because the valve rod of such valve is opened or shutoff stroke is shorter relatively, and have and cut off function very reliably, again because the variation of valve seat port and the stroke relation in direct ratio of closure member are very suitable for the adjusting to flow.Therefore, stop valve is suitable for the cut-out of water system pipeline or regulates flow and throttling usefulness very much.

Safety check is meant and relies on medium itself to flow and automatic open and close flap, claims check valve, one-way valve, reflux valve and back pressure valve again.Safety check belongs to a kind of automatic valve, and it mainly acts on is to prevent that medium from flowing backwards, preventing pump and drive motor counter-rotating, and the releasing of container inner medium.Safety check also can be used for providing on the pipeline of supply to the auxiliary system that wherein pressure possibly rise to above system pressure.

Traditional safety check and stop valve all can only play each own function, when the water system somewhere needs switch, when reconciling water flow and current one-way flow, must install stop valve and safety check simultaneously so.But load onto the shortcoming of stating two valves at the same time be:

1, high with fashionable dress stop valve and safety check expense.

2, big with the space of two kinds of valves needs of fashionable dress.

3, the conventional check valves volume is big, and flow resistance is big, and water hammer pressure is high during valve closing, and installation, maintenance is difficult, and working life is short.

Summary of the invention

To above-mentioned technical problem, the utility model provides a kind of screw down nonreturn valve with non-return and restraining dual functions, need not stop valve and safety check are installed simultaneously, has reduced cost, and it is little to take up room.

The technological scheme that realizes the utility model is following:

A kind of screw down nonreturn valve; Comprise have snout cavity, the valve body of outlet plenum, and the valve seat between snout cavity, outlet plenum, the valve body top is provided with valve gap, valve rod; The valve rod lower end is passed in the valve gap entering valve body, the upper end is passed valve gap and is positioned at the valve gap outside; The lower end of said valve rod is provided with spool, is provided with elastic component between spool and the valve rod, and spool is positioned at the top of valve seat and cooperates with valve seat.

The lower end surface of said valve rod offers axial bore, is provided with the guide rod that can move up and down in the axial bore, and the lower end of guide rod is fixedly connected with spool, and said elastic component is installed on the guide rod between the lower end surface of spool and valve rod.

On the upper end of elastic component and the guide rod between the valve rod lower end surface, packing ring is installed.

Said elastic component is a spring.

The upper end of said valve rod is fixedly connected with handwheel.

Adopted such scheme, rotated handwheel and drive valve rod and descend, spring by the packing ring of valve rod lower end to lower compression; When valve rod dropped to a certain degree, valve rod was pressed on spool on the valve seat downwards through spring, thus valve closing; Play the effect that ends, this moment when current when high-order valve port gets into the valve export chamber, also just valve port is sealed owing to spool is pressed on the valve seat; The pressure of its current only can be pressed on spool on the valve seat, does not hold and can spool not squeezed, so can't flow through valve; This moment, the screw down nonreturn valve role was exactly unidirectional passing through, the effect of reverse non-return; And when rotation handwheel drive valve rod moved up, spring recovered length, and this moment, spool disappeared to the pressure of valve seat, and the gravity of spool and installation accessories is only arranged; Thereby after current get into from snout cavity, because current have certain pressure, under the effect of water flow pressure; Spool can move up along the direction of valve rod, lifts off a seat increasing along with water flow pressure; The decrement of spring is also big more, and the open degree between spool and the valve seat is also big more, thereby realizes the open function of valve.

The utlity model has following beneficial effect:, use screw down nonreturn valve can practice thrift mounting cost and spatial position in the place that needs are installed the pipeline of stop valve and safety check simultaneously or received spatial limitation in the mounting point; Replace a stop valve and a safety check by a screw down nonreturn valve, make the investment of valve member reduce; Owing to the setting of spring, the utility model is compared to common safety check simultaneously, and its resistance is little, and water hammer pressure is little.

Description of drawings

Fig. 1 is the schematic representation of the utility model;

The spool phase diagram that Fig. 2 is not intake for the utility model non-return;

Fig. 3 is the phase diagram of the utility model non-return water inlet back valve core;

Fig. 4 is the cut-off state figure of the utility model;

Among the figure, 1 is snout cavity, and 2 is outlet plenum, and 3 is valve body, and 4 is valve seat, and 5 is valve gap, and 6 is valve rod, and 7 is handwheel, and 8 is spool, and 9 is axial bore, and 10 is spring, and 11 is packing ring, and 12 is guide rod.

Embodiment

Below in conjunction with accompanying drawing and specific embodiment the utility model is further specified.

Referring to Fig. 1,2,3,4; A kind of screw down nonreturn valve, comprise have snout cavity 1, the valve body 3 of outlet plenum 2, and the valve seat 4 between snout cavity 1, outlet plenum 2; Valve body 3 tops are provided with valve gap 5, valve rod 6; Valve gap 5 is connected on the valve body 3 through bolt, between valve gap 5 and valve body 3, is provided with Sealing and prevents to leak, and valve rod 6 lower ends are passed in the valve gap 5 entering valve bodies 3, the upper end is passed valve gap 5 and is positioned at the valve gap outside and is fixedly connected with handwheel 7; The lower end surface of valve rod offers axial bore 9, and the guide rod 12 that can move up and down is installed in the axial bore 9, has certain clearance between guide rod 12 and the axial bore 9; To guarantee that guide rod 12 can move up and down smoothly; The lower end of valve rod is provided with spool 8, and spool 8 is positioned at the top of valve seat 4 and cooperates with valve seat 4, when spool 8 and valve seat 4 fit together; Spool 8 plays seal action, and the lower end of spool 8 upper-end surfaces and guide rod 12 is fixed together; A sheathed packing ring 11 on guide rod 12 simultaneously, the diameter of packing ring 11 be greater than the diameter of valve rod, sheathed spring 10 on the guide rod between packing ring 11 and the spool 12, and restriction is played in the upper end of 11 pairs of springs 10 of packing ring.And the seal face of valve seat is built-up welding ferrous alloy or Si Taili cobalt base hard alloy, have wear-resisting, high temperature resistant, corrosion-resistant, antifraying property is good, the advantage of long service life.From seeing in appearance of screw down nonreturn valve, it is imported and exported not in one plane, and the height of the import of valve is lower than open height.

The working principle of the utility model: rotate handwheel 7, the rotating band ovable valve stem 6 of handwheel 7 descends, and spring 10 is compressed; Make spool 8 be squeezed on the valve seat, when spring 10 was compressed to certain state, spool formed sealing to valve seat; Thereby valve closing; No matter current still are low level mouth when getting into from the high position of valve, all can't pass through valve, and screw down nonreturn valve just plays the effect that ends at this moment; When water when high-order mouthful gets into valve, water flow pressure just in time vertically acts on spool, makes that the pressure between spool, the valve seat increases, engagement fully between this moment spool, the valve seat, current can not be through valve, this moment, valve played the effect of non-return; Backward rotation handwheel 7, under the drive of handwheel, valve rod 6 rises, and spring 10 recovers former length gradually; Pressure between spool 8 and the valve seat 4 also just reduces gradually, at this moment, when current when safety check low level mouth gets into valve; Current back down spool under self pressure, make spool break away from valve seat, and increasing along with water flow pressure; The decrement of spring 10 is also just big more, and the aperture between spool and the valve seat is just big more, and water flow is also just big more.

Claims

1. screw down nonreturn valve; Comprise have snout cavity, the valve body of outlet plenum, and the valve seat between snout cavity, outlet plenum, the valve body top is provided with valve gap, valve rod; The valve rod lower end is passed in the valve gap entering valve body, the upper end is passed valve gap and is positioned at the valve gap outside; It is characterized in that: the lower end of said valve rod is provided with spool, is provided with elastic component between spool and the valve rod, and spool is positioned at the top of valve seat and cooperates with valve seat.

2. a kind of screw down nonreturn valve according to claim 1; It is characterized in that: the lower end surface of said valve rod offers axial bore; Be provided with the guide rod that can move up and down in the axial bore; The lower end of guide rod is fixedly connected with spool, and said elastic component is installed on the guide rod between the lower end surface of spool and valve rod.

3. a kind of screw down nonreturn valve according to claim 2 is characterized in that: on the upper end of elastic component and the guide rod between the valve rod lower end surface, packing ring is installed.

4. according to each described a kind of screw down nonreturn valve among the claim 1-3, it is characterized in that: said elastic component is a spring.

5. according to each described a kind of screw down nonreturn valve among the claim 1-3, it is characterized in that: the upper end of said valve rod is fixedly connected with handwheel.