US 5,404,902 AGranted

Isolation automatic control valve

OwnerBangyan Weninventor

Life of this patent

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Abstract

An isolation automatic control valve is formed by disposing an isolation valve of very simple structure in the inlet and outlet passages of a main valve or in the passage joining a main valve and its pilot valve, which not only controls normal operation during automatic controlling but also can isolate the main valve from the pilot valve for on-line maintenance while simultaneously controlling operation of the main valve manually or automatically. The isolation valve includes a throttling function to enable the main valve to acquire various control parameters. The present invention enumerates nine embodiments of different pressure, flow and direction control valves, each being applicable in various fields of general purpose valves, hydropneumatic valves and instrument valves. The present invention exhibits compact structure, simple piping, adjustable parameters and convenience in operation. Furthermore, the present invention puts forward a pressure automatic control valve having a simplified new structure with manual pressure adjusting and throttling features.

Claims3

Dependent claims

An isolation automatic control valve comprising an automatic main valve and a pilot valve, characterized in that said isolation automatic control valve further comprises an isolation valve;

said isolation valve is disposed on a passage connecting said main valve and said pilot valve;
said isolation valve comprises a valve body and a valve core;
the circumference of said valve core precisely fits a bore formed in said valve body and includes channels formed therein;
said valve core is moveable within said bore of said valve body;
said channels, when said valve core is in a normal position, maintain said passage in fluid communication with said main valve and said pilot valve;
said channels, when said valve core is displaced from said normal position, are similarly displaced and prevented from maintaining fluid communication through said passage between said main valve and said pilot valve;
wherein said isolation valve core further has apertures to maintain fluid communication between a main valve side of said passage and an outlet port of said main valve when said isolation valve is in a position to cut off the passage connecting said main valve with said pilot valve;
said isolation valve being a rotary valve and said apertures of said valve core of said rotary valve including axial passages.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/174,612Filed 28 Dec 1993 · continuation
Priority: CN 91104261.X2 Jul 1991
Granted: 11 Apr 1995
Term ends: Not estimatedThe source records don’t support an estimate.

Classification19 codes

F16K 43/003
An auxiliary valve being actuated independently of the main valve: the auxiliary valve being a rotary valve
F04B 27/1804
By varying the relative positions of a swash plate and a cylinder block: controlled by crankcase pressure
F04C 2/3446
With vanes reciprocating with respect to the inner member: the inner and outer member being in contact along more than one line or surface
F04C 15/06
Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00: arrangements…