Patent ID: 7509969
Filing Date: 2009-03-31
Classification: F16K,Y10T

Abstract:
1. A two-way check valve comprising a sleeve being a hollow pipe, the sleeve having a first inner thread and a second inner thread respectively at inner surfaces of opposite ends thereof, the sleeve having a first sleeve portion and a second sleeve portion, an inner diameter of the first sleeve portion being less than that of the second sleeve portion, the first sleeve portion and the second sleeve portion being respectively defined with a first receiving chamber and a second receiving chamber therein, an inward protruding shoulder being formed between the first receiving chamber and the second receiving chamber; a valve stem eject-rod having an exhaust hole defined along an axis of the valve stem, the valve stem eject-rod having at its lower surface a third outer thread for threading into the first sleeve portion; a connection head being a hollow sleeve, the bottom portion of the connection head connecting to the valve stem eject-rod, a third inner thread being provided at the inner surface of the connection head; an intake connector being an elongated column with an intake hole being defined in the axis thereof, the intake connector including a first threaded connection portion and a second threaded connection portion, the first threaded connection portion and the second threaded connection portion respectively having a first outer thread and a second outer thread at a surface thereof, the first threaded connection portion being threaded into the second sleeve portion; a second valve body being a hollow column, the second valve body having a fourth inner thread at one end thereof which is open and a channel at the other end thereof, the second valve body being defined with a hollow receiving room therein, a blocking surface being formed between the receiving room and the channel, the second valve body being received in the first receiving chamber and being movable longitudinally within the first receiving chamber, an end of the second valve body having the channel extending into the second receiving chamber, a protruding annular portion being provided at the outer surface of the second valve body corresponding to the inward protruding shoulder; a first valve body received in the receiving room of the second valve body and movable longitudinally within the receiving room, the first valve body having a push rod at one end thereof for being received in the channel and a second protruding ring at the other end thereof; a first pressure adjustment module having a first compression resilient member and a first adjustment nut, the first adjustment nut being threaded on the fourth inner thread of the receiving room of the second valve body and being defined with a first through-hole for ventilation, the first compression resilient member being disposed between the first adjustment nut and the second protruding ring of the first valve body whereby the first valve body is forced by the resilience of the first compression resilient member and moved toward the channel of the second valve body, and the second protruding ring is pushed toward the blocking surface by the resilience of the first compression resilient member; and a second pressure adjustment module having a second compression resilient member and a second adjustment nut, the second compression resilient member being disposed at one end of the second valve body having the channel, the second adjustment nut being threadedly engaged with the second inner thread of the second sleeve portion whereby the second compression resilient member is positioned between the second valve body and the second adjustment nut, the second pressure adjustment module providing a resilience whereby the second valve body is forced by the resilience of the second pressure adjustment module and moved toward the open end of the first receiving chamber for achieving a close union and airtightness between the protruding annular portion of the second valve body and the inward protruding shoulder; the second adjustment nut being defined with a second through-hole for ventilation.