CONTROLS FOR VALVES

• US 3,712,578 A
• Filed: 08/24/1970
• Issued: 01/23/1973
• Est. Priority Date: 08/29/1969
• Status: Expired due to Term

• Current Assignee: Peter Leonard Dawson
• Original Assignee: Peter Leonard Dawson
• Inventors: Dawson, Peter Leonard
• Primary Examiner(s): Rosenthal, Arnold
• Application Number:
  US05/066,492
• Time in Patent Office: 883 Days
• Field of Search: 251/35,46,42
• US Class Current: 251/35
• CPC Class Codes: F16K 31/3855 the discharge being effected through the diaphragm and being blockable by a mechanically-actuated member making contact with the diaphragm
• CPC Class Codes: F16K 7/17 the diaphragm being actuated by fluid pressure
• CPC Class Codes: G05D 16/0641 the obturator is a membrane

Abstract

The invention relates to valves wherein the passageway therethrough is closed by a diaphragm and fluid pressure in the line in which the valve is located is used to close the valve. The valve is controlled by an auxiliary valve in a by-pass passage enabling the escape of fluid under pressure acting on the diaphragm to close the valve and a shaped member located in an aperture through the diaphragm such that there is co-ordination between the flow through the aperture and movement of the auxiliary valve.

Claims

1. A valve having means for limiting the amount of opening movement thereof comprising, a valve body having an inlet and outlet, a passageway extending through said body from said inlet to said outlet, wall means in said body and extending across said passageway, said wall means having an aperture therethrough, a valve seat around said aperture, a flexible diaphragm valve secured at its periphery in said valve body adjacent said valve seat in spanning relationship thereto and movable toward and away from said valve seat to control flow through said aperture, said diaphragm valve with said valve body defining a pressure chamber on the side of said diaphragm valve opposite said valve seat, an outlet passage extending from said pressure chamber to the outlet of said valve to vent said pressure chamber, an auxiliary valve in said outlet passage for controlling flow therethrough, an opening through said diaphragm valve from said inlet to said pressure chamber to admit fluid pressure to said chamber to move said diaphragm valve toward said seat, and tapered flow control means having a large end and a small end and extending from said inlet through said opening in said diaphragm valve toward said pressure chamber with the large end positioned on the inlet side of said diaphragm for controlling flow through said opening, said flow control means including a shaped member located on the opposite side of the diaphragm to the flow control means and spaced apart from that part of the flow control means which is as large as the aperture by a distance greater than the thickness of the diaphragm, the shape of the member ensuring a passage past it through the diaphragm and at the same time limiting opening movement of said diaphragm valve in coordination with movement of said auxiliary valve when said auxiliary valve is opened to vent said pressure chamber.

2. A valve as claimed in claim 1 in which the flow control means is in line and integral with the auxiliary valve.

3. A valve as claimed in claim 1 in which the member in the chamber is a sliding interference fit on the stem.

4. A valve as claimed in claim 1 in which the diaphragm is resilient and supported over the seating area by a rigid plate.

5. A valve having means for limiting the amount of opening movement thereof comprising, a valve body having an inlet and an outlet, a passageway extending through said body from said inlet to said outlet, wall means in said body and extending across said passageway, said wall means having an aperture therethrough, a valve seat around said aperture, a flexible diaphragm valve secured at its periphery in said valve body adjacent said valve seat in spanning relationship theReto and movable toward and away from said valve seat to control flow through said aperture, said diaphragm valve with said valve body defining a pressure chamber on the side of said diaphragm valve opposite said valve seat, an outlet passage extending from said pressure chamber to the outlet of said valve to vent said pressure chamber, an auxiliary valve in said outlet passage for controlling flow therethrough, an opening through said diaphragm valve from said inlet to said pressure chamber to admit fluid pressure to said chamber to move said diaphragm valve toward said seat, and flow control means extending from said pressure chamber through said opening in said diaphragm valve toward said inlet for controlling flow through said opening and at the same time limiting opening movement of said diaphragm valve in coordination with movement of said auxiliary valve when said auxiliary valve is opened to vent said pressure chamber, said flow control means including a pair of combination flow control and stop members arranged on opposite sides of said diaphragm valve and mounted on a stem extending through said aperture, said members being inwardly tapered toward one another and spaced apart from one another a distance greater than the thickness of the diaphragm, one of said members positioned at the side of said diaphragm valve opposite said valve seat and allowing flow of liquid therepast from the inlet through the opening in the diaphragm valve, said members each being engageable by said diaphragm to limit movement of said diaphragm toward and away from said valve seat to predetermined amounts.

6. A valve as in claim 5, wherein said one member is slidable on said stem so that in the event of a sudden surge of pressure in the inlet, said one member moves axially on said stem upon being engaged by said diaphragm valve to relieve stresses induced by said pressure surge.