JPH08210526A - Valve - Google Patents

Abstract

PURPOSE: To prevent deterioration due to fluid or damage due to sliding rotation by forming a pressing spring member into a ring in which durable synthetic resin material with excellent heat resistance and chemical resistance is used and an insertion hole for a valve stem is bored in the axial center and arranging circular projections whose points are circularly chamfered on both of upper and lower faces. CONSTITUTION: A pressing spring member 33 is made of durable synthetic resin material with excellent heat resistance and chemical resistance and is used after machined into varied ring shapes. For example, in the pressing spring member 33A, opening edge part sides of ring-shaped plate pieces 38, 39 are connected together via a small diameter cylindrical piece 40, and an insertion hole 41 is formed in the axial center, while ring-shaped projections 42, 43 are arranged along the outer circumference edges on the outside face plates of the ring-shaped plate pieces 38, 39. One of the ring-shaped projections 42, 43 is pressed by means of a valve seat face of a valve seat member 18 while the other is pressed by means of an inside face of a fastening ring 24 via a flat washer 32, so that the ring-shaped plate pieces 38, 39 are compressed and deformed, and as a result, spring force is provided. Therefore, no damage on the sliding face of a valve element member is caused, and deterioration in a sliding property can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve for opening / closing or switching distribution of a high-pressure fluid passage, and for example, a fluid sample is fed under pressure as a main plug of gas or water or when analyzing chemicals. It is used by being installed in a pipe flow path.

[0002]

2. Description of the Related Art An opening / closing valve or a switching valve used for opening / closing or switching distribution of a flow path when a high-pressure fluid sample is pressure-fed is, of course, easy and reliable to operate, but receives a high-pressure fluid. However, a structure that does not cause fluid leakage is required. In addition, a structure that does not cause rust due to a chemical change due to the fluid is required, and when rust occurs, the fluid is contaminated and reliable opening / closing or switching operation cannot be obtained.

As a conventional valve used in this kind of application, for example, a valve seat member having valve holes communicating with the input / output flow passages and opened in the valve seat surface on the upper surface, A valve body member having a bottom surface provided with a communication groove for communicating or blocking between the valve holes, and the valve seat member and the valve body member are mounted in the valve case in a state where the bottom surface is in surface contact with the valve seat surface; A tightening ring is detachably attached to the valve case, and a pressing spring member for pressing the valve body member against the valve seat surface is provided between the tightening ring and the valve body member. There is a structure in which a rod is integrally formed and an upper end side of the valve rod is inserted through the tightening ring to project to the outside, and an operation handle is attached to the upper end side of the valve rod.

In the valve, when the operation handle is rotated, the valve body member is slid on the valve seat surface of the valve seat member in a pressure contact state via the valve rod, and the communication groove is aligned with the valve hole. The channels are connected to each other, and the channels are blocked at other mismatched positions. Further, when the tightening of the tightening ring with respect to the valve case is adjusted, the compression state of the pressing spring member is changed and the spring pressure is increased or decreased, so that the pressure of the high pressure fluid that handles the pressure contact state of the valve body member against the valve seat surface can be counteracted. Can be adjusted. At this time, if the spring pressure is excessively increased, the valve switching operation by the operation handle becomes heavy accordingly. Therefore, it is desirable to adjust the spring pressure so that it does not increase more than necessary.

As the pressing spring member, a metal disc leaf spring 1 formed in a ring shape is usually used as shown in FIG. 5, and the disc leaf spring 1 has a sliding circle on which a plurality of bearings 2 are mounted. The valve plate member 6 is used in combination with the plate 3 and the metal flat spacers 4 and 5 attached to both sides of the sliding disk 3.
It is used in a state where it is inserted into the valve rod 7 which is integral with.

The valve body member 6 and the valve seat member in the above-mentioned valve have a small friction coefficient in order to reduce wear due to sliding to improve the sealing property against high pressure fluid and prevent corrosion due to fluid. A synthetic resin material such as a fluororesin having excellent chemical properties is used. However,
Since the valve body member 6 formed of a synthetic resin material such as fluororesin has a low surface hardness, when the disc leaf spring 1 made of metal that is compressed and deformed is slidably contacted with the valve body member 6, the disc The tip edge of the leaf spring 1 may damage the sliding contact surface of the valve body member 6 to reduce the slidability, and the switching operation by the operation handle may be disabled during long-term use.

[0007]

Therefore, in order to prevent deterioration of slidability due to damage to the sliding contact surface of the valve body member 6, the sliding disk 3 having the bearing 2 mounted thereon as described above.
Although the flat spacers 4 and 5 on both sides are used together, the number of parts is increased and the configuration is complicated, resulting in higher product cost and the metal disc leaf spring 1 and the bearing 2.
If the flat spacers 4 and 5 are exposed to even leaked moisture or gas atmosphere, they may deteriorate or corrode during long-term use, making it impossible to reliably perform valve switching operation. And the like may be mixed in the high-pressure fluid as impurities and contaminate them.

Further, in the case of the pressing spring member formed of the metal disc spring 1, the spring pressure characteristic when compressed by the pressing by the tightening ring is not satisfactory. That is, it is desirable that the pressure contact state of the valve body member with respect to the valve seat surface can be arbitrarily adjusted so that the spring pressure characteristic of the pressing spring member can oppose the pressure of the high-pressure fluid handled as described above. In the case of the spring 1, it is difficult to obtain an intermediate pressure and the pressure adjustment width is narrow.

Therefore, the present invention aims to provide a valve for solving the problems in the prior art.

[0010]

In order to solve the above-mentioned problems, in a valve according to the present invention, a valve seat communicating with an input / output flow path is formed by opening a valve hole on a valve seat surface on the upper surface. And a valve body member having a bottom surface provided with a communication groove for communicating or blocking between the valve holes. The valve seat member and the valve body member are in the valve case in a state where the bottom surface is in surface contact with the valve seat surface. The valve case is detachably attached to the valve case, and a pressing spring member for pressing the valve body member against the valve seat surface is provided between the tightening ring and the valve body member. A valve rod is connected to the member, and the upper end side of the valve rod is inserted through the tightening ring so as to project to the outside, and an operating means for rotating the valve member is attached to the upper end side of the valve rod. In the valve, the pressure spring member has a mechanical strength close to that of metal. Made of a strong synthetic resin material that has excellent heat resistance and chemical resistance, and is formed into a ring shape with a valve rod insertion hole formed in the shaft center, and the top and bottom surfaces are arcuately shaped. In this configuration, chamfered annular protrusions are provided.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A valve according to the present invention will be described below in detail with reference to the embodiments shown in FIGS. As shown in FIGS. 1 to 3, the valve case 11 formed in a cylindrical shape with a bottom has
An input side connection port 12 and an output side connection port 13 are formed by opening screw holes bored in a left-right opposing manner on the outer peripheral surface, and a screw-type connector (not shown) is inserted into each of the connection ports 12 and 13. The input side pipe 14 and the output side pipe 15 are connected to each other.

The valve case 11 has a threaded cylindrical portion 16 formed on its outer circumference with a screw formed on the upper side, and a stepped groove hole is formed inside the threaded cylindrical portion 16 and the upper side of the groove hole is formed. The large-diameter hole formed in is provided with a sliding guide groove 17 in which a part of the inner peripheral surface is cut out in an arc shape, and the disk-shaped valve seat member 18 is provided in the small-diameter hole formed in the lower side. It is installed. In addition,
The valve seat member 18 is integrally fixed to the groove of the valve case 11 in a press-fitted state with an adhesive, for example. Inner bottom portions of the input side connection port 12 and the output side connection port 13,
A communication hole 1 is formed between the stepped groove and the inner bottom of the groove.
9 and 20 are bored, and the valve seat member 18 has a communication hole 1
Valve holes 21 and 22 are formed to match 9 and 20, respectively.

The valve case 11 including the threaded cylindrical portion 16 and the valve seat member 18 are made of a synthetic resin material having excellent chemical resistance. Particularly, the valve seat member 18 whose upper surface is the valve seat surface has a small friction coefficient. A synthetic resin material such as a fluororesin having excellent chemical resistance is used. In this embodiment, the valve seat member 18 is formed separately from the valve case 11 for the reason of facilitating the molding process and reducing the cost, but there is also a mode in which both are integrally molded. Further, the bottom surface of the valve case 11 is provided with a screw hole 23 for attaching the valve to an appropriate place via a bracket or the like.

The tightening ring 24 attached to the opening of the valve case 11 has an internal thread 25 engraved on the inner peripheral surface thereof to be screwed into the threaded cylindrical portion 16, and has an outer peripheral surface for facilitating tightening. A through hole 27 is formed on the shaft center so as to insert the valve rod 26 therethrough.

The valve rod 26 has an engaging portion 28 formed by a flat surface formed by cutting out a part of the outer circumference on the upper end side in an arc shape, and a valve body member 29 is integrally formed on the lower end side of the valve rod 26. There is. The valve body member 29 is a disc-shaped member that fits in a small diameter small diameter hole of the stepped slot formed in the screw cylinder portion 16, and has a valve hole 21 formed in the valve seat member 18 at the bottom surface. An elongated communication groove 30 is provided to allow communication between the two. Also,
A locking pin 31 is provided on the valve body member 29 so as to project from the outer peripheral surface along the direction in which the communication groove 30 extends.

The valve rod 26 and the valve body member 29 are made of a synthetic resin material having excellent chemical resistance. In this embodiment, they are integrally molded for the reason of easy molding and low cost. There is also a mode in which both are formed separately and assembled together. In that case, in particular, the valve body member 29 whose outer peripheral surface and bottom surface are in sliding contact with the valve seat surface of the valve seat member 18 has a small friction coefficient and is resistant to wear. It is desirable to use a synthetic resin material having excellent chemical properties, such as a fluororesin.

As shown in FIG. 4, a ring-shaped flat washer 32 and a pressing spring member 33 are fitted to the valve rod 26, and the tightening ring 24 is fitted to the upper end. A cap 34 is fitted and attached to the portion. The cap 34 is provided with a screw hole 35 for screwing an operation handle 36 having a threaded portion on the outer periphery on the distal end side.
The cap 34 is formed in a radial direction from the outer periphery so as to reach a shaft hole into which the valve rod 26 is fitted.
The flow path display 37 is provided along the extending direction of the.

When the screw hole 35 of the cap 34 is aligned with the engaging portion 28 formed by the flat surface of the valve rod 26 and the tip screw portion of the operation handle 36 is screwed into the screw hole 35, the operation is performed. The cap 34 is connected to the tip of the valve rod 26 in a state in which the tip of the handle 36 is pressed against the locking portion 28 to prevent the cap 34 from rotating, and the cap 34 is pressed against the flat washer 32 fitted to the outer periphery of the valve rod 26. The spring member 33 and the tightening ring 24 form the cap 34 and the valve body member 29.
It is sandwiched in the state of being prevented from coming off.

As a result, the valve 10 is divided into upper and lower halves as shown in FIG.
When the female screw 25 of the tightening ring 24 is screwed onto the threaded cylindrical portion 16 on the valve case 11 side, it is integrally assembled as shown in FIG. 1 or 3. When assembled, the valve member 29
The locking pin 31 is aligned with the slide guide groove 17 of the screw cylinder portion 16. When the tightening force of the tightening ring 24 is adjusted, the pressing force on the pressing spring member 33 changes, and the compression deformation state of the pressing spring member 33 is changed, so that the valve body member 29 is pressed against the valve seat surface of the valve seat member 18. Can be set as desired.

The pressing spring member 33 is a tough material having mechanical strength and rigidity close to that of metal, and excellent heat resistance and chemical resistance, such as PEEK material (polyether ether ketone) and PPS material (polyphenylene sulfide). It is used in a state of being processed into various ring shapes as shown in FIG. 5 using various synthetic resin materials. Further, it is desirable that the flat washer 32 also be made of the same synthetic resin material as the pressing spring member 33.

In the pressing spring member 33A shown in FIG. 5 (a), the opening edge portions of two ring-shaped plate-like pieces 38 and 39 arranged in parallel are connected by a small-diameter cylindrical piece 40, and the axial center is formed. In addition to forming the insertion hole 41, the ring-shaped plate-shaped pieces 38, 39 are provided with annular protrusions 42, 43 along the outer peripheral edge of the outer face plate, and the tips of the annular protrusions 42, 43 are chamfered in an arc shape. . In the pressing spring member 33A, one of the annular protrusions 42 and 43 is pressed by the valve seat surface of the valve seat member 18, and the other is pressed by the inner surface of the tightening ring 24 via the flat washer 32, so that the ring-shaped plate-like pieces 38 and 39 are formed. A spring force is applied by being bent inward and compressed.

The pressing spring member 33B shown in FIG. 5 (b) is formed by one ring-shaped plate-shaped piece 45 having an insertion hole 44 formed in the axial center, and the ring-shaped plate-shaped piece 45 has an inner peripheral edge. An annular protrusion 46 protruding along one of the outer side plates is formed along with an annular protrusion 47 protruding along the outer peripheral edge of the other outer face plate, and the tips of the annular protrusions 46, 47 are arcuate. Is chamfered. In the pressing spring member 33B, one of the annular protrusions 46 and 47 is pressed by the valve seat surface of the valve seat member 18 and the other is pressed by the inner surface of the tightening ring 24 via the flat washer 32, and the ring-shaped plate-shaped piece 45 is S-shaped. The spring force is applied by being bent and compressed.

In the pressing spring member 33C of FIG. 5C, the outer peripheral sides of two ring-shaped plate-shaped pieces 48 and 49 arranged in parallel are connected by a large-diameter cylindrical piece 50 and inserted into the shaft center. The hole 51 is formed, and the ring-shaped plate-shaped pieces 48, 49 are provided with annular protrusions 52, 53 along the inner peripheral edge of the outer face plate, and the tips of the annular protrusions 52, 53 are chamfered in an arc shape. . In the pressing spring member 33C, one of the annular protrusions 52 and 53 is the valve seat member 1
The other is pressed by the inner surface of the tightening ring 24 via the flat washer 32 by the valve seat surface of 8, and the ring-shaped plate-like pieces 48 and 49 are respectively bent inward and compressed and deformed, so that a spring force is applied. .

Since these spring members utilize the flexibility of the synthetic resin material, the spring force is gradually increased according to the tightening of the tightening ring 24, and is an intermediate spring as compared with a metal disc spring. The force can be obtained, and there is no possibility that the fluid to be treated causes corrosion or deterioration, or contaminates the fluid. In addition, since it is in sliding contact with the valve seat surface of the valve seat member 18 and the flat washer 32 in a pressure contact state via an annular projection whose tip is chamfered in an arc shape, the opening / closing operation of the valve 1 can be performed smoothly and There is no fear of damaging the seat surface. Further, when the pressing spring members 33A and 33C are shaped, the adjustment range of the spring force can be widened. It should be noted that any one of the spring members 33A, 33B, and 33C can be used alone or a plurality of them can be used in combination.

In the valve 1 having the above structure, the tightening force of the tightening ring 24 is varied, and the pressure contact state of the valve body member 29 against the valve seat surface of the valve seat member 18 is changed to the fluid pressure of the fluid to be handled so as to prevent fluid leakage. It is set to a minimum value within a range that it can withstand so that an excessive operating force is not required when the cap 34 is rotated by the operating handle 36. When the cap 34 is rotated by the operation handle 36, the valve body member 29 is rotated via the valve rod 26, and the valve body member 29 is engaged with both ends of the slide guide groove 17 of the screw cylinder portion 16. The stop pin 31 is rotated within a range in which it abuts, and in the above-described embodiment, it is rotated within a range of about 90 degrees to open / close or switch the flow path. For example, both ends of the communication groove 30 on the starting end side are the valve holes 2
In the valve open state in which the flow paths are in communication with the valves 1 and 22, the valve body member 29 is rotated to cause a mismatch, and the valve is closed.

[0026]

As is apparent from the above embodiments, in the valve according to the present invention, as a pressing spring member for pressing the valve body member against the valve seat surface of the valve seat member, it has mechanical strength and rigidity similar to metal and heat resistance. In addition, a tough synthetic resin material with excellent chemical resistance is used to form a ring shape with a valve rod insertion hole formed in the shaft center. The configuration is provided for each. Thus, unlike the conventional structure in which a metal disc leaf spring is used as the pressing spring member, a simple and inexpensive structure that does not require a sliding disc with a bearing for imparting slidability is provided. Therefore, the sliding contact surface of the valve body member is not damaged, and the slidability can be prevented from decreasing. In addition, even if the fluid leaks during long-term use and is exposed to a moisture or gas atmosphere, the parts including the pressure spring member made of the synthetic resin material do not deteriorate or corrode. However, the problem that the valve switching operation cannot be performed reliably, and the degenerated or corroded debris and the like are mixed as impurities in the high-pressure fluid and contaminated, is eliminated. Further, the synthetic resin pressure spring member having the above structure has a wider pressure adjustment range and a spring pressure characteristic capable of being set to an intermediate pressure, as compared with a metal disc leaf spring. When the pressure contact state of the valve body member with respect to the valve seat surface is adjusted by varying the tightening of the tightening ring according to the It is possible to set the member to be smoothly rotated.

[Brief description of drawings]

FIG. 1 is an external perspective view of a valve according to an embodiment of the present invention in an assembled state.

2 shows a perspective view of the valve of FIG. 1 with the upper half part separated from the lower half part.

FIG. 3 is a central longitudinal sectional view of the valve of FIG. 1 in an assembled state.

FIG. 4 is a perspective view of a valve body member of the valve of FIG. 1 and a flat washer and a spring member used for pressing the valve body member.

5 is a front view showing a cutaway view of various spring members used in the valve of FIG. 1. FIG.

FIG. 6 shows a perspective view of a valve body member used in a conventional valve and related parts of a spring member used to press the valve body member.

[Explanation of symbols]

 10 valve 11 valve case 12 input side connection port 13 output side connection port 14 input side pipe 15 output side pipe 16 screw tube part 17 sliding guide groove 18 valve seat member 19,20 communication hole 21,22 valve hole 23,35 screw Hole 24 Tightening ring 25 Female thread 26 Valve rod 27 Through hole 28 Locking part 29 Valve body member 30 Communication groove 31 Locking pin 32 Flat washer 33 Pressing spring member 34 Cap 36 Operation handle 37 Flow path display

Claims (1)

[Claims] 1. A valve seat member having valve holes respectively communicating with the input / output passages and opened on a valve seat surface on the upper surface, and a communication groove for communicating or blocking between the valve holes. The valve seat member is provided in the valve case, and the valve seat member and the valve body member are mounted in the valve case with the bottom surface in contact with the valve seat surface, and the tightening ring is detachably attached to the valve case. With
A pressing spring member for pressing the valve body member to the valve seat surface is provided between the tightening ring and the valve body member, a valve rod is connected to the valve body member, and the tightening ring is attached to the upper end side of the valve rod. In a valve that is inserted and protruded to the outside, and the operation means for rotating the valve body member is attached to the upper end side of the valve rod, the pressing spring member has mechanical strength and rigidity close to those of metal, and A ring-shaped projection with a tough synthetic resin material with excellent heat resistance and chemical resistance, formed in a ring shape with a valve rod insertion hole in the center axis, and chamfered tips on the upper and lower surfaces in an arc shape. The valve is characterized in that each is provided.