Valves with built-in orifices and flow control devices

Abstract

To provide an orifice built-in valve which achieves improvement of maintainability and sealability.SOLUTION: An orifice built-in valve has a body 10 in which a storage recessed part 13, having a built-in valve element and connected with a primary side passage 11 and a secondary side passage 12, is defined. The valve element includes: a gasket 15 including a lower tier primary side through hole and a lower tier secondary side through hole and having a substantially discoid shape; an orifice base 20 disposed on the gasket and having a middle tier primary side through hole; an orifice plate 30 disposed on the orifice base; an inner member 40 which is disposed above the orifice plate and having an upper tier primary side through hole and an upper tier secondary side through hole; a valve seat 50 provided in a periphery of an opening of the upper tier primary side through hole of the inner member; a fixing ring 60 which threadedly engages with an inner peripheral surface of the storage recessed part 13 and fixes each element; and a diaphragm 70 which contacts with or separates from the valve seat to block and allow communication between the primary side through hole and the secondary side through hole.SELECTED DRAWING: Figure 1

Claims

1. It has a body that defines a primary side passage, a secondary side passage, and a housing recess that opens on the top surface and houses a valve element, and the primary side passage and the secondary side passage open on the bottom surface, The aforementioned valve element is A substantially disc-shaped gasket made of a soft material and positioned at the bottom of the receiving recess, having a lower primary through-hole communicating with the primary flow path and a lower secondary through-hole communicating with the secondary flow path, An orifice base is positioned on the gasket and has a middle primary through-hole that communicates with the lower primary through-hole, An orifice plate is placed on the orifice base and has an orifice formed thereon that communicates with the lower primary through hole, An inner member is placed on the orifice plate and has an upper primary through-hole that communicates with the orifice and opens to the upper surface, and an upper secondary through-hole that communicates with the lower secondary through-hole and opens to the upper surface, A valve seat is provided on the upper surface of the inner member around the opening of the upper primary side through hole, A fixing ring that screws onto a threaded portion formed on the inner circumferential surface of the receiving recess and presses the inner member toward the bottom, thereby fixing the inner member, the orifice plate, the orifice base, and the gasket to the body, The inner member includes a diaphragm positioned on the inner member, spaced apart from or in contact with the valve seat, and communicating or blocking the upper primary through-hole and the upper secondary through-hole, The bottom surface of the receiving recess has a first annular projection that surrounds only the opening of the primary side channel and the opening of the secondary side channel, and a second annular projection that surrounds the first annular projection and the opening of the secondary side channel. A third annular projection is formed on the lower surface of the orifice base, with its entire circumference facing the first annular projection and surrounding the opening of the primary through-hole in the middle section. A fourth annular projection is formed on the lower surface of the inner member, with its entire circumference facing the second annular projection and surrounding the opening of the upper secondary through hole. An annular lower end surface is formed on the outer circumference side of the fourth annular projection of the inner member. An orifice-integrated valve is configured such that when the inner member is pressed by the fixing ring until the annular lower end surface contacts the stepped surface formed in the housing recess, the first and second annular projections bite into the lower surface of the gasket by a predetermined amount, and the third and fourth annular projections bite into the upper surface of the gasket by a predetermined amount, thereby sealing the primary flow path and the connection between the lower primary through-hole and the middle primary through-hole, and the secondary flow path and the connection between the lower secondary through-hole and the upper secondary through-hole.

2. The system further includes an actuator that drives a diaphragm retainer that presses against the diaphragm, thereby opening and closing the space between the diaphragm and the valve seat. The orifice-integrated valve according to claim 1, wherein the diaphragm is pressed toward the inner member by the casing of the actuator, which is screwed into a threaded portion common to the threaded portion, and is fixed to the inner member.

3. The orifice-embedded valve according to claim 1, wherein the orifice base and the inner member are formed of materials having the same hardness.

4. The orifice-integrated valve according to claim 1, wherein the third and fourth annular projections have a shape in which at least their tops are rounded in cross-sectional view, and the radii of curvature of the tops of the third and fourth annular projections are equal.

5. The orifice-integrated valve according to claim 1, wherein the orifice base has an annular support surface on its upper side to which the lower surface of the outer periphery of the orifice plate is positioned, and the widthwise center circles of the annular support surface, the third annular projection, and the first annular projection are formed to coincide when viewed from above.

6. The valve seat is made of resin and is fixed to the inner member by crimping, as described in claim 1.

7. The orifice-integrated valve according to claim 1, wherein the inner member is positioned by a portion of its outer circumferential surface fitting into the inner circumferential surface of the receiving recess, and the orifice base is positioned by a portion of its outer circumferential surface fitting into the inner circumferential surface of the inner member.

8. A flow control device comprising an orifice-integrated valve according to any one of claims 1 to 7.

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