LIQUID LEVEL CONTROL DEVICES

• US 3,763,881 A
• Filed: 08/25/1971
• Issued: 10/09/1973
• Est. Priority Date: 08/25/1971
• Status: Expired due to Term

• Current Assignee: Hugh Gwynfryn Jones
• Original Assignee: Hugh Gwynfryn Jones
• Inventors: Jones, Hugh Gwynfryn
• Primary Examiner(s): Schwadron, Martin P.
• Assistant Examiner(s): Matthews, David R.
• Application Number:
  US05/174,792
• Time in Patent Office: 776 Days
• Field of Search: 137/245,414 251/35,45,46
• US Class Current: 137/414
• CPC Class Codes: E03D 1/32 Arrangement of inlet valves devices for reducing noise E03D9/14 ; noise-reducing means E03D11/00
• CPC Class Codes: F16K 31/34 acting on pilot valve controlling the cut-off apparatus
• CPC Class Codes: Y10T 137/7374 Flexible diaphragm valve

Abstract

A device for controlling a flow of liquid from a liquid pressure source comprising a main valve which is actuated by application of the liquid pressure of the source under the control of a pilot valve, in the case of a float controlled valve for a reservoir the pilot valve is actuated directly by a float in the reservoir; the construction reduces to a minimum the dimensions of float required and provides accurate control of the liquid level in the reservoir. The device also includes a flow restrictor which is mounted on a control member of the main valve, the latter being supported by an annular diaphragm which is moved by the applied liquid pressure to close the outlet of the main valve, and is arranged to restrict the liquid flow as the control member approaches the closed position; this prevents concussive shock in the flow of liquid.

Claims

1. A device for controlling a flow of liquid from a pressure source, the device comprising a control valve having an inlet from the pressure source, an outlet, a valve chamber connecting the inlet and the outlet, and a control member movable between positions in which the outlet is open and closed with respect to the inlet, wherein the device further comprises a resilient annular diaphragm;

a disc, which constitutes the aforesaid control member, supported centrally of the said diaphragm;

an annular valve surface formed on the outlet of the valve chamber against which the control member abuts when in the closed position;

a sub chamber partitioned from the valve chamber by the diaphragm and the control member;

a bleeder connecting the sub chamber with the inlet;

a pilot valve adapted to control the liquid pressure in the sub chamber whereby to control the position of the control member, and a perforate flow restrictor supported on the control member centrally of the annular valve surface and axially movably with respect to the control member, the flow restrictor being adapted to contact the valve surface as the control member approaches the closed position thereby to reduce the flow through the outlet before the latter is closed by the control member.

2. A device in accordance with claim 1, wherein the control member has an aperture and a pin extends through said aperture so as to define the dimensions of an annular passageway which constitutes the said bleeder and to ensure that said passageway cannot become obstructed by solid particulate material in the liquid.

3. A device in accordance with claim 2, wherein the pin is of tapered form and is arranged to reduce the dimensions of the bleeder as the control member approaches the closed position.

4. A device in accordance with claim 3, wherein the perforate flow restrictor is of hollow conical form, is supported on the control member with its annular base adjacent the latter and is adapted to be received within the outlet as the control member approaches the closed position.