Abstract: A dual active selector valve is set forth. In the preferred and illustrated embodiment, a flange supporting a manifold body is attached to a pressure vessel. The passage through the flange has a selected diameter and the manifold body opens out to a larger diameter, sufficient to enable two valves to be connected side by side, having inlet passages equal in diameter to about one half the selected diameter. A rotatable conduit member is mounted within the manifold body having a centrally located pin for rotation, the rotatable portion incorporating separate flow passages selectively connecting to one of the two alternately deployed valves, and also supporting a valve closure plate to plug the passageway into the valve not being used.

Abstract: In a valve having a valve body and a bonnet mounted on the valve body, a bonnet lock secures the bonnet against relative rotation with the valve body. The bonnet lock cooperates with a pin driven into the valve body to lock the bonnet against rotation. Unequally spaced slots formed about the lower end of the bonnet lock permit adjustment of the bonnet lock for alignment with the lock pin. A jam nut threadably mounted on the bonnet engages the bonnet lock and maintains it in position.

Abstract: A fluid pressure boost attachment (18) is attached to a pilot valve (16) which senses the fluid pressure in a main flow line F. Upon restriction or blockage of fluid flow through inlet line (32) to pilot valve (16) the correct static fluid pressure is sensed in auxiliary fluid chamber (126) of boost attachment (18). Boost attachment (18) is actuated upon a predetermined pressure differential being reached between chambers (100) and (126) thereby to move actuator (120) and place intermediate fluid chamber (24) of pilot valve (16) in fluid communication with outlet fluid chamber (28) thereof.

Abstract: A valve manifold (18) between a main flow line (10) and a differential pressure transmitter (24) having a body (40) with a bore (48) in which three spherical ball valve members (72, 74, 76) are mounted for rotation among run, zero and calibration positions. A low pressure calibrating port (28) and a high pressure calibrating port (46) are controlled by calibration valve member (76). Low pressure calibrating port (28) is connected to a source of a predetermined low pressure calibrating fluid and high pressure calibrating fluid port (46) is connected to a source of a predetermined high pressure calibrating fluid to calibrate transmitter (24) between any desired low pressure and high pressure ranges. Low pressure calibrating port (28) and high pressure calibrating port (46) may be selectively connected to atmospheric pressure if desired and the calibrating fluids may be controlled from a remote control site (26).

Abstract: For use with a safety relief valve, a pilot valve is disclosed. The preferred and illustrated embodiment of the pilot valve incorporates a pressure moved spindle within a housing, the housing being drilled and incorporating a valve and valve seat mechanism. The device is adapted to be connected to a high pressure inlet source. In addition, it has a flow path from the inlet through a needle orifice. This needle orifice chokes the flow into an outlet port. The outlet is provided for controlling a safety relief valve. A third path past the valve element is included which conducts fluid to an exhaust port. A coil spring forms a force in one direction for the valve element while the inlet line pressure forms a force in the opposite direction. When the inlet pressure is sufficiently high, the valve element is moved, thereby opening the valve.

Abstract: In the preferred and illustrated embodiment, a multivalve manifold control and interlock system is set forth. The multivalve manifold comprises three valves arranged within a valve body, wherein valve stems with optional handles are located above the valve body to be gripped and rotated. The valve body encloses three ball or plug valves. They are switched by 90.degree. rotation. Each stem supports a circular disk, and the three stems are equipped with three circular disks which interlock. Certain arcuate notches are cut in the circular disks. The arrangement of the notches limits the sequence in which the valves are opened and closed. Moreover, opening and closing is constrained to the sequence required for safe operation of the multivalve manifold. Further, a lock bar is incorporated, and is profiled to fit with the valve stems for locking.

Abstract: A safety pressure relief device for a refrigerated liquified gas storage vessel having a large diameter valve seat mounted on the vessel, a valve closure movably mounted to engage the valve seat to close flow therethrough and to move away from the valve seat to relieve pressure in the vessel, a spindle extending through the seat and guided by a spider spanning the seat, a spring within the vessel biasing the valve closure toward the seat and means of preselected strength retaining the valve closure on the seat unitl a preselected maximum desired fluid pressure is reached within the vessel at which time such retaining means fails and valve closure moves to open position to provide large area relief of fluid pressure from the vessel.

Abstract: A pressure transmitter manifold having a block with an inlet in communication with a pair of outlets, valve means controlling communication between the inlet and said outlets, valve controlled bleed and test connections in communication with said outlets and means for supporting said manifold block in a preselected position.

Abstract: A check valve having a body with a passage therethrough, a pair of vanes pivotally mounted within said passage so that they open and close flow therethrough responsive to flow in one direction, said vanes having an arcuate shape to create a smooth venturi passage between each vane and the opposed wall of the body so that the vanes open responsive to excess flows in the direction opposite to said one direction.

Abstract: A check valve having a body with an inlet, an outlet, a valve seat surrounding communication between said inlet and said outlet, a valve chamber in said body communicating with said outlet, a bonnet having a cylinder therein with the open end communicating with said valve chamber where the bonnet is secured to said body, a valve disc resiliently secured to an arm which is pinned to allow the valve disc to be pivoted from a position engaging said valve seat to a position in said valve chamber, a piston in the bonnet cylinder and having a connecting rod secured to said valve disc arm so that said piston reciprocates in said cylinder as said valve disc moves, a port through the piston to allow passage of the fluid flowing through the check valve to flow to opposite sides of the piston as it reciprocates in the cylinder, a reed valve secured to said piston and adapted to substantially close said port during closing movement of said valve disc but allow relatively free flow of fluids through said port during openi

Abstract: A support structure for a differential pressure transmitter and its valve manifold including an angle plate supported from a pipe, fasteners securing the valve manifold to the angle plate and fasteners securing the transmitter to the valve manifold and the method of servicing the transmitter by removing it from the valve manifold without disconnecting the support structure.

Abstract: An internal tank valve having a seating plate defining a valve seat, a valve member, a straight line linkage supporting and guiding movement of the valve member to and from engagement with the valve seat, the valve member having a rounded surface facing the direction of flow through the valve seat, a pressure equalizing valve in the valve member, means for moving the valve member into and from engagement with the valve seat and means for absorbing shock loading on the valve member.