Poppet relief valve

A poppet type relief valve comprising a seat and poppet, means responsive to pressure on one side of said poppet to open said poppet at a predetermined pressure to provide flow through said valve in one direction, and means responsive to pressure on the opposite side of said poppet to open said poppet at a predetermined pressure to provide flow through said valve in the opposite direction, including an actuator for said poppet operative to pull said poppet from said seat at a predetermined pressure, a lost motion connection between said actuator and poppet, and a poppet compression spring between said actuator and poppet urging the latter toward said seat.

A relief valve comprising a seat and a spring-loaded poppet, a spring-loaded actuator, and lost motion means interconnecting said actuator and poppet, whereby pressure on one side of said poppet will cause it to open at a predetermined pressure, and pressure on the other side will also cause it to open at another predetermined pressure, said poppet including a stem and said actuator including a bore receiving said stem, and said lost motion connection including a slot transversely of said stem and elongated axially of said stem, and a pin secured to said actuator and extending through said stem.

A relief valve comprising a seat and a spring-loaded poppet, a spring-loaded actuator, and lost motion means interconnecting said actuator and poppet, whereby pressure on one side of said poppet will cause it to open at a predetermined pressure, and pressure on the other side will also cause it to open at another predetermined pressure, said spring-loaded actuator including an actuator compression spring urging said actuator toward said seat, and a positive stop limiting movement of said actuator toward said seat, and said spring-loaded poppet including a spring between said poppet and actuator preloaded to a lesser extent than said actuator spring.

A relief valve comprising a seat and poppet, first spring means urging said poppet into engagement with said seat, an actuator, second spring means urging said actuator toward said seat, stop means limiting movement of said actuator toward said seat, and lost motion means interconnecting said actuator and poppet, said poppet being exposed to pressure on one side of said poppet causing said poppet to open at a predetermined pressure against the bias of said first spring means, and said actuator being exposed to pressure on the other side of said poppet causing movement of said actuator away from said seat against the bias of said second spring means thus also causing said poppet to open, when said lost motion means is taken up, at another predetermined pressure.