Differential pressure valve
AssigneeTgk Co., Ltd.
InventorsHisatoshi Hirota, Tokumi Tsugawa, Yuusuke Inoue
Life of this patent
Estimating the term…
Abstract
A differential pressure valve simplified in construction includes a piston integrally formed with a main valve element and arranged on the upstream side of a main valve to define a chamber for introducing refrigerant from an inlet port. The piston has an orifice and a refrigerant passage for communicating with a chamber on a back surface side of the piston. The chamber is configured such that it can be connected, via a refrigerant passage and a pilot valve element, to a chamber on the downstream side of the main valve, which communicates with an outlet port.
Claims14
A pilot-operated differential pressure valve for controlling a flow rate of fluid such that a differential pressure of the fluid between an inlet and an outlet for the fluid becomes equal to a differential pressure set by a value of an electric current caused to flow through a solenoid, the differential pressure valve comprising:
- a main valve having a main valve element arranged in a manner opposed to a main valve seat formed in a passage between the inlet and the outlet, from an upstream side of said main valve;
- a piston integrally formed with said main valve element to define a first chamber between said piston and said main valve seat, said first chamber communicating with said inlet, said piston having a restricted passage for communicating between said first chamber and a second chamber formed on an opposite side of said piston of said first chamber;
- and
- a pilot valve having a pilot valve element arranged in a manner opposed to a pilot valve seat from a downstream side, said pilot valve arranged between said second chamber and a third chamber in communication with said outlet, for controlling a pressure in said second chamber.
Dependencies are inferred from the claim text.