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US 6,296,013 B1Granted
Pressure/flow rate control valve
AssigneeSMC Corporation
InventorsMasayuki Hosono, Qinghai Yang
Life of this patent
Estimating the term…
Abstract
Disclosed is a pressure/flow rate control valve comprising a valve-opening/closing section having a valve plug which is installed with an elastic member having a substantially tapered cross section at one end, a stem which is displaceable integrally with the valve plug and which is installed with a packing disposed between a pair of disk sections separated from each other by a predetermined spacing distance, and a spring member which is fastened to one end of the stem, for seating the valve plug on an annular projection in accordance with the action of resilient force.
Claims6
A pressure/flow rate control valve comprising:
- a first valve body formed to have a cylindrical configuration with a secondary port formed at a first end;
- a second valve body including two cylindrical members joined integrally in directions substantially perpendicular to one another, said second valve body being rotatable about a center of rotation of said first valve body;
- a third valve body formed to have a substantially bent L-shaped configuration, said third valve body being rotatable about a center of rotation of a projection of said second valve body;
- a tube joint section arranged in said third valve body and provided with a tube joint for detachably connecting a tube member to a primary port;
- a flow rate-adjusting section arranged in said second valve body, for adjusting a pressure fluid flowing through a passage communicating with said primary port to have a predetermined flow rate;
- a valve-opening/closing section arranged on a first end side of said first valve body, for opening/closing a first communication passage for making communication between said primary port and a secondary port;
- and
- a check valve section arranged on a second end side of said first valve body, for allowing only said pressure fluid directed from said secondary port to said flow rate-adjusting section to flow therethrough via a second communication passage, wherein:
- said valve-opening/closing section includes a valve plug with an elastic member having a tapered cross section installed to its first end, a stem installed with a packing, for making displacement integrally with said valve plug, and a spring member fastened to a first end of said stem, for pressing said valve plug toward an annular projection formed on an inner wall surface of said first valve body;
- and a valve-closed state is given when said valve plug is seated on said annular projection in accordance with an action of resilient force of said spring member, while a valve-open state is given when said valve plug is separated from said annular projection against said resilient force of said spring member by using said pressure fluid supplied from said primary port to provide a pilot pressure.
7 more elements
A pressure/flow rate control valve comprising:
- a main valve body having a primary port and a secondary port;
- a valve-opening/closing section provided for said main valve body, for opening/closing a communication passage between said primary port and said secondary port;
- a first flow rate-adjusting section provided with a first check valve for blocking flow of a pressure fluid from said primary port to said secondary port, said first check valve forcing said pressure fluid introduced from said primary port to flow through a first adjustable opening for adjusting said pressure fluid introduced from said primary port to have a predetermined flow rate;
- and
- a second flow rate-adjusting section provided with a second check valve for blocking flow of said pressure fluid from said secondary port to said primary port, and having a second adjustable opening for further adjusting said pressure fluid passed through said first flow rate-adjusting section to have a predetermined flow rate, wherein
- said valve-opening/closing section and said first and second flow rate-adjusting sections are provided in parallel to make communication and connection with each other between said primary port and said secondary port respectively.
3 more elements
Dependencies are inferred from the claim text.