Valve with pressure assisted closing system
AssigneeOtis Engineering Corporation
InventorsRennie L. Dickson, Craig W. Godfrey, Kenneth L. Schwendemann, Timothy J. Noack
Life of this patent
Estimating the term…
Abstract
A valve employing a coupling disk to rotate the valve member so that rotative force is applied to the valve member in a direction away from the seat during opening of the valve and/or in a direction toward the seat during closing of the valve. Closing force is provided by a spring in a dome chamber and a gas charge in the dome chamber. A float valve controls fluid entry into the dome chamber to trap the gas charge therein while permitting the introduction of liquid from a balance-closure assist line to increase the pressure of the gas charge and assist in closing the valve member.
Claims9
A valve comprising:
- a body having a flowway therethrough;
- a valve seat and cooperable valve member controlling flow through said passageway;
- and
- means for moving said valve member between open and closed positions comprising:
- a chamber having a piston slidable therein,
- said chamber above said piston providing a control chamber having a port for receiving control fluid,
- said chamber below said piston providing a dome chamber,
- said piston sealing between said control and dome chambers
- a port opening into the bottom of said dome chamber,
- a charge of gas in said dome chamber, and
- a float valve and seat positioned in the bottom of said dome chamber and controlling said dome chamber port, whereby said gas may be introduced through said port driving any liquid in said port into said dome chamber to increase the pressure therein and said gas will be trapped in said dome chamber when said liquid in said dome chamber drops to a predetermined level and permitting said float valve to seat against said float valve seat to assist in closing said valve member.
A valve comprising:
- a body having a flowway therethrough,
- valve means controlling said flowway,
- a fluid chamber in said body,
- piston means dividing said chamber into a control fluid chamber and a pressure dome and sealing therebetween,
- said piston means connected to and moving said valve means between open and closed positions with reciprocation of said piston means,
- a charge of gas under pressure in said dome urging said piston means toward valve closing position,
- an inlet into the bottom of said pressure dome,
- a liquid float check valve and seat positioned in the bottom of said dome chamber and controlling said inlet,
- whereby said gas may be introduced through said inlet driving any liquid in said inlet into said dome chamber to increase the pressure therein and said gas will be trapped in said dome chamber when said liquid in said dome chamber drops to a predetermined level and permitting said float valve to seat against said float valve seat to assist in closing said valve member.
Dependencies are inferred from the claim text.