Abstract: An overflow vent valve comprising a housing adapted to be installed wherein it is desirable to release excessive gas pressure from a flow system while precluding the discharge of liquid therefrom, a normally closed pressure responsive check valve disposed within the housing, a ported cage secured to the check valve and suspended within the interior of the housing for communication fluid pressure from the housing to the check valve, and a lightweight ball loosely disposed within the interior of the ported cage for floating on the surface of any liquid present within the interior of the cage, the ball adapted to engage a second valve seat provided on the check valve in the event the level of the liquid rises sufficiently within the cage, the engagement of the lightweight valve with the second valve seat precluding the discharge of liquid from the overflow vent valve assembly.

Abstract: A relief valve adapted for use with either a liquid or gaseous flow stream and comprising a body having a cage member secured thereto and housing all of the working elements of the valve, the cage member being readily removable from and engagable with the body for converting the valve from liquid to gas installations and also removable from the body without disturbing the installation of the valve in a flow line, fluid containing vessel, or the like.

Abstract: A fluid dampened back pressure regulator valve comprising a housing having an inlet port in communication with a fluid pressure source and an outlet port in communication with the inlet port, a valve seat disposed within the housing for cooperation with a valve closure member to provide alternate open and closed positions for the valve, an adjustable control spring operable for maintaining the closure member in a normally closed position and compressible upon the presence of excessive pressure at the inlet port for releasing the closure member for opening of the valve, and a fluid dampened piston assembly interposed between the spring and the closure member for dampening the opening and closing action for reducing damage to the internal elements of the valve and for eliminating valve clatter during opening and closing of the valve.

Abstract: A safety valve formed of a body with a fluid inlet and outlet and a passageway there between having a reduced diameter port providing an internal radial ledge, a cylindrical seat member supported on the internal ledge, the seat member having a circumferential groove in the upper face, the groove having an inner frusto-conical surface tapering inwardly in the upper direction so that the width of the groove is wider at the top than at the bottom, a toroidal elastomeric seal received in the seat member groove, the lower portion of the seal being configured to correspond to the groove with an integral upwardly extending reduced internal diameter lip portion, a cylindrical seat retainer member engaging the upper end of the seat member to retain it in position and simultaneously engaging a portion of the upper surface of the seal to retain it in the groove, and a spring biased ball member positioned above the seat member permitting so that fluid flow through the valve body when the fluid pressure exceeds a pre-sele