Abstract: An adjustable blowdown safety valve is provided for use on a pressure vessel or a flow line with a pressurized fluid therein. In the preferred embodiment, the adjustable blowdown safety valve comprises a body with a closed bonnet and a chamber therein and an inlet and an outlet; the inlet including a valve seat; a disk member with an attached stem member closable on the valve seat; a mechanism in the body biasing the disk member to rest on the valve seat; a guide member supported in the bonnet to guide and limit disk member movement; and a skirt member affixed to the body, which surrounds the disk member and defines a uniform flow area in combination with a blowdown ring. The presented adjustable blowdown safety valve has improvements, which remove detriments to disk member movement, resulting in an adjustable blowdown safety valve with predictable performance and improved reliability.

Abstract: An adjustable blowdown safety valve is provided for use on a pressure vessel or a flow line with a pressurized fluid therein. In the preferred embodiment, the adjustable blowdown safety valve comprises a body with a closed bonnet and a chamber therein and an inlet and an outlet; the inlet including a valve seat; a disk member with an attached stem member closable on the valve seat; a mechanism in the body biasing the disk member to rest on the valve seat; a guide member supported in the bonnet to guide and limit disk member movement; and a skirt member affixed to the body, which surrounds the disk member and defines a uniform flow area in combination with a blowdown ring. The presented adjustable blowdown safety valve has improvements, which remove detriments to disk member movement, resulting in an adjustable blowdown safety valve with predictable performance and improved reliability.

Abstract: A safety relief valve is provided that comprises a body comprising a chamber therein and an inlet and an outlet, the inlet comprising an inlet valve seat; a disk member closable on the inlet valve seat; and a mechanism in the body biasing the disk member to rest on the inlet valve seat with a set force such that when the pressure in the inlet exceeds a set pressure resulting from the set force, the disk member is lifted from the inlet valve seat, the mechanism comprising a combination of a coil spring and one or more disk springs stacked in series with the coil spring. A method of preparing a coil spring for use in a pressure relief valve comprises measuring the spring rate of the coil spring and; modifying the spring so as to modify its spring rate to be within ±2% of a desired spring rate.

Abstract: A safety relief valve is provided that comprises a body comprising a chamber therein and an inlet and an outlet, the inlet comprising an inlet valve seat; a disk member closable on the inlet valve seat; and a mechanism in the body biasing the disk member to rest on the inlet valve seat with a set force such that when the pressure in the inlet exceeds a set pressure resulting from the set force, the disk member is lifted from the inlet valve seat, the mechanism comprising a combination of a coil spring and one or more disk springs stacked in series with the coil spring. A method of preparing a coil spring for use in a pressure relief valve comprises measuring the spring rate of the coil spring and; modifying the spring so as to modify its spring rate to be within ±2% of a desired spring rate.

Abstract: A safety relief valve is provided that comprises a body comprising a chamber therein and an inlet and an outlet, the inlet comprising an inlet valve seat; a disk member closeable on the inlet valve seat; and a mechanism in the body biasing the disk member to rest on the inlet valve seat with a set force such that when the pressure in the inlet exceeds a set pressure resulting from the set force, the disk member is lifted from the inlet valve seat, the mechanism comprising a combination of a coil spring and one or more disk springs stacked in series with the coil spring. A method of preparing a coil spring for use in a pressure relief valve comprises measuring the spring rate of the coil spring and; modifying the spring so as to modify its spring rate to be within ±2% of a desired spring rate.

Abstract: A safety relief valve is provided that comprises a body comprising a chamber therein and an inlet and an outlet, the inlet comprising an inlet valve seat; a disk member closable on the inlet valve seat; and a mechanism in the body biasing the disk member to rest on the inlet valve seat with a set force such that when the pressure in the inlet exceeds a set pressure resulting from the set force, the disk member is lifted from the inlet valve seat, the mechanism comprising a combination of a coil spring and one or more disk springs stacked in series with the coil spring.

Abstract: A snap-type safety relief valve is provided that is designed for use under specified operating conditions on a pressure vessel or a flow line having a pressurized gas therein.

Abstract: A snap-type safety relief valve is provided that is designed for use under specified operating conditions on a pressure vessel or a flow line having a pressurized gas therein.