Bi-directional flow control system
AssigneeGrove Valve and Regulator Company
InventorPeter C. M. Chow
Life of this patent
Estimating the term…
Abstract
For use in a fluid system, which includes a control valve or the like having one port to which the higher of two pressures is delivered and another port from which fluid flows to the lower of two pressures, a four-way shuttle valve with high and low pressure ducts. Pressure level passages connected from the two pressure zones, are each connected by lateral transfer passages to both the high and low pressure ducts. One-way check valves in each of the four lateral passages enables flow only to the high pressure port and from the low pressure port. In the event of pressure reversal, the check valves will shift so that flow is always from the high pressure line to the high pressure duct of the shuttle valve.
Claims4
A bi-directional pipeline pressure control system comprising:
- a main control valve adapted for connection into a pipeline and having flow passages at opposite ends thereof and a pressure control chamber;
- a pilot valve for said control chamber including an inlet port connected to a high pressure line, a load port connected to said pressure control chamber;
- and a dumping port connected to a low pressure line;
- a first pair of branch lines connected between one of said main valve flow passages and said high and low pressure lines;
- a second pair of branch lines connected between the other of said main valve flow passages and said high and low pressure lines;
- and
- first and second pairs of one-way check valves in said first and second pairs of branch lines, one check valve of each pair thereof being conditioned to enable flow only from one of said main valve flow passages to said high pressure line and the other of said pair being conditioned to enable flow only from said low pressure line to said one main valve flow passage.
A bi-directional pipeline pressure control system comprising:
- a fluid flow conduit including a main control valve;
- a pressure control chamber in said main control valve;
- a pilot valve for said control chamber including an inlet port connected to a high pressure line, a load port connected to said pressure control chamber;
- and
- a dumping port connected to a low pressure line;
- a first pair of branch lines connected between said fluid flow conduit, on one side of said main control valve, and said high and low pressure lines;
- a second pair of branch lines connected between said fluid flow conduit, on the other side of said main control valve, and said high and low pressure lines;
- and
- first and second pairs of one-way check valves in said first and second pairs of branch lines, one check valve of each pair thereof being conditioned to enable flow only from the upstream side of said main control valve to said high pressure line and the other of said pair being conditioned to enable flow only from said low pressure line to the downstream side of said main control valve.
Dependencies are inferred from the claim text.