JP2001141084A - Compact ball valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact ball valve device capable of facilitating manufacture, assembly, and disassembly greatly and having excellent durability, corrosion resistance, heat resistance, and seal leakage prevention function and general-purpose property. SOLUTION: An inner valve casing C which has an inward flange part 9 forming a valve seat 8 at one end and an outward flange part 10 at the other end on an inner peripheral face of a first outer valve casing A among the first outer valve casing A and a second outer valve casing B which constitute a valve body 1, respectively, and stores a coil spring 12 bringing a spherical body 11 into pressure-contact with the valve seat inside it is fitted in such a way that the inward flange part 9 forms an annular clearance 13 between an inner face of an annular end wall 3 of the first outer valve casing A and it. The outward flange part is locked and fixed in an annular end face 14 of the first outer valve casing A. A seal ring 15 coming into contact annularly and elastically with an exposed spherical face part 11A of the spherical body 11 exposed on an outer side of a valve seat port in a condition in which it is brought into pressure-contact with the valve seat 8 is compressed and fitted in the annular clearance 13. Each valve casing is integrally molded by synthetic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball valve device having a structure in which a sphere as a valve body is elastically pressed against a valve seat by a coil spring.

[0002]

2. Description of the Related Art A ball valve device having the above-mentioned structure has been conventionally used as a check valve, a relief valve, a safety valve, or the like. Although widely used for large-sized fluid equipment, in such a conventionally known ball valve device, components such as a valve body and a valve seat for accommodating a valve element and a coil spring are generally made of a mild steel material or the like. Made of metal material such as bronze and brass, and the inlet and outlet joints are made separately from those members, and screwed into the inlet and outlet of the valve box or with bolts, nuts and other various connections Each is connected using a member.

[0003]

Water, such as water for tap water, includes Ca, Mg which more or less corrode metals.
Not only contains salts and other impurities such as
Oxygen, carbon dioxide, and the like are dissolved, and when they are heated to increase the evaporation rate, the concentration of impurities increases, thereby promoting the corrosion of the metal in contact with the impurities. In the case of fluid equipment such as a boiler, in order to prevent corrosion caused by impurities in the feedwater, it is possible to maintain the water quality appropriately by performing a physical or chemical treatment on the feedwater. Tap water, especially polluted by corrosive components of copper, is toxic and can no longer be used for drinking water. Therefore, when the valve box, valve seat, etc., which are indispensable components of the ball valve device, are made of the above metal material,
It is extremely dangerous to use the ball valve device not only for supplying heated drinking water but also for supplying drinking water at normal temperature, because it is harmful to human health. Therefore, the conventionally known ball valve device cannot use tap water as it is or by heating it and use it as hot water or hot water for cooking or processing foods or preparing processed beverages.

Further, in the conventionally known ball valve device, as described above, the inlet joint and the outlet joint are formed separately from the components of the valve box, and the inlet and the outlet of the valve box are screwed or bolted. , Nuts, and various other connecting members are used, so that threading by a machine tool is required, or procurement and connection work of the connecting members are required, and the processing and assembly are troublesome. Furthermore, in this type of ball valve device, it is required to completely prevent leakage of the seal. Conventionally, to meet this demand,
Precision machining was performed on metal valve seats with cutting or polishing tools, and non-metallic materials such as fiber, leather, hard rubber, etc. were machined on valve seats. In addition, it is not only difficult to sufficiently meet the demand, but also there is a disadvantage that those materials are fatigued by repeated contact with the valve body and are worn relatively early.

[0005] The present invention has been made in view of the above-mentioned problems of a conventionally known ball valve device,
Not only is it very easy to assemble and disassemble, but it also has excellent mechanical and chemical properties such as durability, corrosion resistance, heat resistance, etc., and seal leakage prevention function. It can be used for fluid equipment as well as tap water as it is or it can be heated and used as hot water or hot water for cooking or processing food or preparing processed beverages. Its primary purpose is to provide a ball valve device.

[0006]

In order to achieve the above object, a small ball valve device according to the present invention has a structure in which a sphere as a valve body is elastically pressed against a valve seat by a coil spring. At the other end of a cylindrical first outer valve casing having an annular end wall provided with an inlet joint at one end, and an annular end wall provided with an outlet joint at one end; A valve box formed by detachably connecting the other end of a cylindrical second outer valve casing having an outer diameter larger than the outer diameter of the first outer valve casing to each other; Of the first and second outer casings to be configured,
A coil spring that has an inward flange portion formed with a valve seat at one end and an outward flange portion at the other end on the inner peripheral surface of the first outer valve casing, and presses a sphere inside the valve seat inside. The inner flange of the first valve casing is positioned near the annular end wall of the first outer valve casing so as to form an annular gap with the inner surface of the annular end wall. And a structure in which the outward flange portion of the inner valve casing is locked and fixed to the annular end surface of the other end portion of the first outer valve casing, and in a state where the outer flange portion is pressed against the valve seat by the coil spring. A rubber seal ring elastically elastically contacting the annular gap from the outside of the valve seat to the exposed spherical portion of the sphere partially exposed to the outside of the valve seat opening, in the annular gap; 2 each outer valve Pacing and said inner valve casing with each synthetic resin is characterized in that it has integrally molded. For advantageous embodiments of the invention, reference is made to the claims.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the accompanying drawings showing specific examples.

FIG. 1 shows a small ball valve device as an example of an embodiment of the present invention. In the drawing, reference numeral 1 denotes a valve box of the small ball valve device. The valve box 1 has a cylindrical first outer valve casing A having an annular end wall 3 provided with an inlet joint 2 at one end, and an annular end wall 6 provided with an outlet joint 5 at one end. And a cylindrical second outer valve casing B having an outer diameter larger than the outer diameter of the first outer valve casing A, and a male screw portion formed on the outer periphery of the other end of the first outer valve casing A. 4 and a female screw 7 formed on the inner circumference of the other end of the second outer valve casing B.

Reference symbol C denotes an inward flange portion 9 having a valve seat 8 formed at one end and an outward flange portion 10 at the other end, and a sphere 11 press-fitted into the valve seat 8 inside. 6 is an inner valve casing that houses the coil spring 12. The inner valve casing C has an inward flange portion 9 located at a position near the annular end wall 3 of the first outer valve casing A so that an annular gap 13 is formed between the inner flange surface and the inner side surface of the annular end wall 3. It is fitted to the inner peripheral surface of the first outer casing A so as to be formed, and is fixed by engaging the outward flange portion 10 with the annular end surface 14 at the other end of the first outer casing A. I have. In the annular gap 13, an annular portion 11 </ b> A of the spherical body 11 partially exposed to the outside of the valve seat opening while being pressed against the valve seat 8 by the coil spring 12 from the outside of the valve seat 8. A rubber-made seal ring 15 for completely preventing the valve from leaking in the case where the fluid is prevented from flowing in the opposite direction by elastic contact with the seal ring 15 is compressed.

The first and second outer valve casings A and B and the inner valve casing C are integrally formed of a synthetic resin which is excellent in mechanical strength, heat resistance, chemical resistance and the like. I have. Synthetic resins having these properties include polyacetal, polyethersulfone (PE
S), polyphenin sulfide (PPS) and the like. Of these synthetic resins, PES is 16
In addition to being able to withstand hot water and steam at 0 ° C, it also has the property of not being attacked by acids or alkalis even at high temperatures.
Since it is a resin with high heat resistance that can withstand steam, and because it is a synthetic resin that conforms to the food hygiene standards of Notification No. 20 of the Ministry of Health and Welfare, when using a ball valve device as a safety valve for high-temperature fluid, When used as a check valve by being attached to a pressure-feeding pipeline of drinking water heated to a high temperature, each of the valve casings A, B, and C is made of the PES or PPS.
It is good to form using. If the synthetic resin as described above is used, for example, the inner valve casing C has an outer diameter of 8 to 1 mm.
It is possible to easily form a very small cylindrical body of about 6 mm.

A seal ring 15 compressed in an annular gap 13 between the inner surface of the annular end wall 3 and the inward flange 9.
In the illustrated example, is an elastic sealing member formed of a rubber material having high mechanical strength, heat resistance, and chemical resistance such as silicon rubber and fluoro rubber, and having an X-shaped cross section. Of the four annular projections protruding from
The inwardly projecting downstream annular projection 15A elastically contacts the exposed spherical portion 11A of the sphere 11, and the outwardly projecting downstream annular projection 15B is in contact with the inner peripheral surface of the first outer valve casing A. It is in elastic contact with the annular end face of the inward flange portion 9 of the inner valve casing C. The seal ring 15 having the X-shaped cross section is optimal, but instead of this,
A U-shaped cross section may be used. The valve seat 8 is formed as a spherical seat on the inward flange portion 9 to improve the close contact with the spherical body 11 as a valve body. The sphere 11 is formed of non-magnetic stainless steel having corrosion resistance, ceramic or alumina. The coil spring 12 is made of a non-magnetic stainless steel wire having high strength and high corrosion resistance.

The movement of the spherical body 11 as a valve body in the downstream direction when the valve is opened is limited to a portion of the inner peripheral surface of the inner valve casing C at a predetermined distance downstream from the valve seat 8. A plurality of stop projections 16 are provided. These stop projections 16 facilitate the operation of the valve, and the coil spring 1 due to repeated use of the valve.
2 has a function of reducing metal fatigue.

Reference numeral 17 denotes an annular projection projecting inward from the inner surface of the annular end wall 6 of the second outer valve casing B along the axis thereof, and defines an outlet of the valve box 1 and The other end of the coil spring 12 having one end engaged with the sphere 11 is fitted on the outer periphery. 18 is the annular projection 17
An annular groove formed on the inner surface of the annular end wall 6 concentrically with the inner valve casing B to prevent fluid leakage between the second outer valve casing B and the inner valve casing C. A gasket 19 made of the same material as that of the seal ring 15 is fitted so as to elastically contact the outward flange portion 10 of C.

FIG. 2 shows a specific example of another embodiment of the present invention. In the illustrated small ball valve device, the inlet joint 2 is connected to the first joint.
It differs from that shown in FIG. 1 only in that it is formed integrally with the outer casing A so as to extend at right angles to the axis of the outer casing A, and other configurations are substantially the same as those of the latter. Therefore, the same parts or members are denoted by the same reference numerals, and description thereof will be omitted to avoid repetition. As will be described later, this example is suitable for use as a safety valve by being vertically attached to a horizontally arranged fluid supply line.

FIG. 3 is an exploded perspective view of the small ball valve device shown in FIG. 2, illustrating the order of assembling or disassembling the device. 1, A is a first outer valve casing, B is a second outer valve casing, C is an inner valve casing, 19 is a gasket, 12 is a coil spring, 11 is a sphere, 1
5 is a seal ring. When assembling, first
A gasket 19 is fitted into the annular groove 18 of the second outer valve casing B described above. Next, the spherical body 11 is pushed into the upstream side thereof against the above-mentioned stop projection 16 so that the inner valve casing C housed therein is pushed out of the outward flange portion 1.
The spherical body 11 is inserted into the second outer valve casing B from the zero side.
Is engaged with the other end of the coil spring 12. Thereafter, the male screw 4 of the first outer valve casing A in which the seal ring 15 is contracted is screwed into the female screw 7 of the second outer valve casing B and tightened to complete the assembly. The disassembly may be performed by reversing the above-described assembling order, and is extremely simple. Therefore, maintenance / inspection and replacement of parts can be performed easily and efficiently.

FIG. 4 shows an example of use of a small ball valve device according to the present invention. In this usage example, one of the ball valve devices is connected as a check valve X to the suction pipe P1 of the small gear pump P, while the other one of the ball valve devices is connected as a relief valve or a safety valve Y to the pump P. The case where it is connected to the discharge pipe P2 and used is shown. In the figure, P3 is a pump casing, 20 is a pipe joint connecting the outlet joint 5 of the check valve X and the suction pipe P1 of the pump P, 21 is the inlet side of the inlet joint 2 of the safety valve Y and the pump P The inlet joint 2 of the check valve X is connected to a water storage tank, an oil storage tank and other fluid supply sources via a supply pipe (not shown), and is connected to the discharge pipe P2. The outlet side of the inlet joint 2 is connected to a pressure tank, hot water or heat storage container, food steamer or other fluid supply object via a feed pipe (not shown). The outlet joint 5 of the safety valve Y is connected to a pipe such as a circulation pipe according to the purpose of use.

In the above example of use, when the operation of the small gear pump P is started, the action of the suction pressure causes the sphere 11 of the check valve X to oppose the elasticity of the coil spring 12 in FIGS. Since it is forcibly moved to the left, that is, in the downstream direction, and separates from the valve seat 8 to form a valve-open body, the fluid is sucked into the inner valve casing C from the valve seat opening, and the outlet joint 6 and the suction pipe P 1 After that, it flows into the casing P3 of the pump P, is pressurized by a pair of rotating gears (not shown) in the casing, and is discharged by the discharge pipe P2.
Is discharged from. The fluid discharged in this way is pressure-fed to the fluid supply object via the above-described feed pipe,
When the fluid pressure in the feed line exceeds a predetermined value, the safety valve Y operates. In other words, in FIGS. 2 and 3, the spherical body 11 as a valve body is in a predetermined state against the elasticity of the coil spring 12. (In the example shown, the stop projection 16 limits the head), and the valve is opened to escape the overpressure. When the operation of the pump P is stopped, the check valve X closes due to the elasticity of the spring 12, and prevents the reverse flow of the fluid.

The small gear pump P has been disclosed by the present inventor in Japanese Patent No. 1499331 (Japanese Patent Publication No. 63-46276) and Utility Model Registration No. 1733368 (Japanese Utility Model Publication No. Sho 62-62).
No. 40150), a small gear pump (for example, 270 × 110 × 8) in which metal is not used at all or hardly on the pump casing, gears and other parts that come into contact with liquid.
It is preferable to use an oil, a liquid having a strong acidity, a liquid having a strong alkalinity, a liquid having a low temperature or a high temperature, and other liquids which can be widely used for sucking up and pumping various liquids. The piping is also desirably made of a synthetic resin which is excellent in mechanical strength, heat resistance, chemical resistance and the like as described above. Incidentally, in the small ball valve device according to the present invention, the valve box 1 is composed of the first outer valve casing A and the second outer valve casing B formed of the synthetic resin having excellent mechanical strength as described above. However, since the inner valve casing C of the same material is tightly fitted therein, the inner valve casing C is reinforced by the inner valve casing C and has a substantially double shell structure. The structure is small enough to withstand high-pressure fluid.

Further, in the small ball valve device according to the present invention, the seal ring 15 is made of a rubber material such as silicon rubber, fluorine rubber or the like, which has excellent mechanical strength, heat resistance and chemical resistance, and has an X-shaped cross section. In addition to being formed in a U-shape, the inner surface of the annular end wall 3 and the inward flange 9
Since it is compressed in the annular gap 13 therebetween, it is not affected by the resilience of the coil spring 12 on the spherical body 11 as a valve body, and the contact pressure on the spherical body 11 is constant. Not only that, but also excellent sealing effect can be maintained.

As described above, the small ball valve device according to the present invention has an inlet joint at one end in a ball valve device having a structure in which a spherical body as a valve body is elastically pressed against a valve seat by a coil spring. The other end of a cylindrical first outer valve casing having an annular end wall, an annular end wall provided with an outlet joint at one end, and an outer diameter of the first outer valve casing. A valve box formed by removably connecting the other end of a cylindrical second outer valve casing having a large outer diameter to each other, and the first and second valves constituting the valve box; The outer valve casing has an inward flange portion having a valve seat formed at one end on an inner peripheral surface of the first outer valve casing, an outward flange portion at the other end, and a sphere inside. The inner valve casing housing the coil spring to be pressed against the seat A flange portion located at a position near the annular end wall of the first outer valve casing and fitted so as to form an annular gap between the first outer valve casing and the inner surface of the annular end wall; The outward flange portion is connected to the first
An outer spherical surface portion of a spherical body partially exposed to the outside of the valve seat opening in a state of being pressed against the valve seat by the coil spring; A rubber seal ring elastically elastically contacting the annular gap from the outside of the valve seat in the annular gap; and integrating the first and second outer valve casings and the inner valve casing with synthetic resin, respectively. According to the present invention, not only is it extremely easy to manufacture, assemble and disassemble, but also mechanical properties such as durability, corrosion resistance, heat resistance, and chemical properties. It has excellent mechanical properties and seal leakage prevention function, and can be used for fluid equipment such as small hydraulic pumps and hydraulic pumps. Heating or heating it as hot water or hot water to cook or process food or prepare processed beverages, for example, heating food such as meat buns and buns at convenience stores and grocery stores, and coffee and tea It is possible to obtain a versatile, lightweight and small ball valve device which can be used for the purpose of supplying hot water used for preparation and the like.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of a small ball valve device as a specific example of an embodiment of the present invention.

FIG. 2 is a vertical sectional side view of a small ball valve device as a specific example of another embodiment of the present invention.

FIG. 3 is an exploded perspective view of the device shown in FIG. 2;

FIG. 4 is a partially longitudinal side view showing an example of use of the small ball valve device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve box A 1st outer valve casing B 2nd outer valve casing C Inner valve casing 2 Inlet joint 3 Annular end wall 4 Male thread part 5 Outlet joint 6 Annular end wall 7 Female thread part 8 Valve seat 9 Inward flange part 10 Outward Flange part 11 Sphere 11A Exposed spherical part of sphere 12 Coil spring 13 Annular gap 14 Annular end face 15 Seal ring 16 Stop projection

 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference) 3H058 AA04 BB03 BB23 BB24 BB25 BB29 CA20 CA21 CB04 CB26 CB32 CC17 CD05 CD21 EE02 EE03 EE06 3H059 AA08 BB04 BB23 BB24 BB25 BB30 CA17 CA18 CB04 FF18 CC03 FF04

Claims (8)

[Claims] 1. A ball valve device having a structure in which a spherical body serving as a valve body is elastically pressed against a valve seat by a coil spring, wherein a first cylindrical member having an annular end wall provided with an inlet joint at one end. A cylindrical second outer side having an other end of the outer valve casing and an annular end wall provided with an outlet joint at one end, and having an outer diameter larger than the outer diameter of the first outer valve casing; A valve box formed by removably connecting the other end of the valve casing to each other, and the first and second outer valve casings constituting the valve box, among the first outer valve casing, On the peripheral surface, an inward flange portion having a valve seat formed at one end and an outward flange portion at the other end, respectively, and an inner valve casing containing a coil spring for pressing a sphere against the valve seat inside. The inward flange portion is the first
The outer valve casing is located near the annular end wall and fitted so as to form an annular gap with the inner surface of the annular end wall. (1) The outer valve casing has a structure in which it is locked and fixed to an annular end surface at the other end portion thereof, and an exposed spherical surface of a sphere partially exposed to the outside of the valve seat opening when pressed against the valve seat by the coil spring. A rubber seal ring elastically elastically contacting the portion from the outside of the valve seat in the annular gap, and the first and second outer valve casings and the inner valve casing are each made of synthetic resin. Small ball valve device characterized by being integrally molded. 2. The small ball valve device according to claim 1, wherein the synthetic resin is polyacetal, polyester sulfone, or polyphenine sulfide. 3. A valve box in which a male thread formed on the outer periphery of the other end of the first outer valve casing and a female thread formed on the inner periphery of the other end of the second outer valve casing are screwed to each other. The small ball valve device according to claim 1, wherein the small ball valve device is formed by: 4. The method according to claim 1, wherein the valve seat is formed as a spherical seat and the sphere is formed from non-magnetic stainless steel, ceramic or alumina. Small ball valve device. 5. The sealing ring having an X-shaped cross section or a U-shaped cross section.
5. The rubber material according to claim 1, wherein the rubber material is formed in a letter shape and is made of rubber having high mechanical strength, heat resistance and chemical resistance, such as silicon rubber and fluorine rubber. 2. The small ball valve device according to 1. 6. The small ball valve device according to claim 1, wherein the coil spring is made of a non-magnetic stainless steel wire having high strength and high corrosion resistance. 7. A plurality of fins for restricting movement of a spherical body as a valve body in a downstream direction when a valve body is opened at a position on the inner peripheral surface of the inner valve casing at a predetermined distance downstream from the valve seat. The small ball valve device according to any one of claims 1 to 6, wherein a stop projection is provided. 8. The inner valve casing having an outer diameter of 8 to 8.
The small ball valve device according to any one of claims 1 to 7, wherein the small ball valve device is a small cylindrical body of about 16 mm.