초록 ▼

The invention disclosed herein relates to a check valve actuator for opening and closing a check valve, utilizing system pressure. The check valve actuator is comprised of a piston connected to a clapper assembly by a connecting rod. The piston is slideably received in a piston cylinder containing a

The invention disclosed herein relates to a check valve actuator for opening and closing a check valve, utilizing system pressure. The check valve actuator is comprised of a piston connected to a clapper assembly by a connecting rod. The piston is slideably received in a piston cylinder containing a control valve and a latching stem. A protective cage and a protective cover are mounted over the piston cylinder.

대표청구항 ▼

A check valve for use in a gas-pressured pipeline comprising: a clapper-type closure member pivotally suspended within said check valve; a vertically disposed piston/cylinder assembly mounted above said check valve with sufficient clearance between said piston and said cylinder to enable said piston

A check valve for use in a gas-pressured pipeline comprising: a clapper-type closure member pivotally suspended within said check valve; a vertically disposed piston/cylinder assembly mounted above said check valve with sufficient clearance between said piston and said cylinder to enable said piston to move downward within said cylinder by the force of gravity, and to enable gas to pass between said piston and said cylinder; a linkage pivotally connected at one end to the lower end of said piston and at its other end to said closure member such that upward movement of said piston will open said closure member; and a control valve connected to said cylinder above said piston operable to release pressure from said cylinder.