Abstract: An in-line high pressure fluid release valve is formed by a valve body having a cylinder and having a transverse opening forming a fluid passageway interposed in a fluid conductor. A piston normally closing the fluid passageway and having a fluid passageway size transverse opening is guided to prevent angular rotation during longitudinal sliding movement in the cylinder by a piston rod and a cylinder wall supported guide rod projecting into a piston wall slot for mating and mismating the piston opening with the flow passageway. A pin cage connected with the piston rod end of the cylinder axially supports a collapsible pin normally biasing the piston to a fluid passageway closed position until upstream fluid pressure of a predetermined value channeled through a cylinder wall fluid bypass at the piston end opposite the piston rod to bias the piston toward a passageway open position for releasing fluid pressure downstream.

Abstract: A pressure relief valve for monitoring pressure in relatively large diameter conductors containing relatively high fluid pressure. The valve having housing openings of equal diameter with respect to the conductor and a flow passageway is provided with different diameter coaxial sleeves slidably receiving dual diameter interconnected pistons. The smaller diameter piston forms a flow passageway stop while the larger diameter piston generates a pressure differential with respect to the smaller diameter piston for moving both pistons toward a flow passageway open position in which a piston rod guides the pistons in their axial movement with respect to the sleeves and collapses a pressure collapsible pin supported by a pin cage connected with the valve body in axial alignment with the piston rod for opening the valve passageway and releasing fluid pressure from the conductor.

Abstract: A combination pressure relief valve is formed by a cylindrical valve body secured to a vessel containing fluid to be monitored. The end of the valve body opposite the vessel is normally closed by superposed dual valves comprising primary and secondary valves closing the valve body against excessive fluid pressure by a cage supported collapsible pin. Openings in the primary valve are normally closed by the spring biased secondary valve but are opened by ambient air pressure on the secondary valve, in the event of fluid pressure below atmospheric in the vessel being monitored.

Abstract: A low gas pressure emergency shutdown valve forms part of a valve body having a flow passageway interposed in a gas supply line and forming a gas pressure regulator having a diaphragm/spring responsive poppet valve and a companion diaphragm responsive shutoff valve in the upstream end portion of the valve body maintained open by a pin bearing against the shutoff valve stem. Downstream fluid pressure, in response to a predetermined pressure limit in a flow control chamber, biases the diaphragm in a pin collapsing direction and moves the shutoff valve to a flow passageway closed position.

Abstract: A low fluid pressure emergency shutdown valve is formed by a valve body having a flow passageway interposed in a gas supply line downstream from a pressure regulator. A diaphragm responsive valve in the valve body is maintained open by a pin interposed between the valve stem and the downstream end portion of the valve body. Upstream fluid pressure, in response to a pressure regulator failing in the open position, above a predetermined limit biases the diaphragm downstream to collapse the pin and move the valve to a flow passageway closed position.

Abstract: An explosion vent installation for a closed space comprising a door swingably mounted for outward movement. An elongated pressure collapsible pin is supported at one end, by an arm end portion overlying the door edge portion opposite its hinges and in the direction of the door opening movement. The other end of the arm is pivotally connected with a pin supported body mounted on a door jam. The pin is supported at its other end by a pin support bolt in the pin support body. The arm is moved in a pin collapsing direction by the door opening in response to excess pressure above a predetermined value in the space monitored.

Abstract: A disc orifice valve for providing a constant volume of fluid flowing through a high pressure fluid line is formed by a valve body having in-line inlet and outlet ports. Dual bores in the valve body transversely intersecting the fluid flow passageway between the inlet and outlet ports respectively receive multiple orifice discs for controlling the volume of fluid entering the valve and a poppet valve assembly controlled by a diaphragm fluid pressure balanced on its opposite sides maintaining the poppet valve in an open position in accordance with the volume of fluid at the inlet port and biased open by spring pressure.

Abstract: A fluid flow restrictor choke valve is formed by a right angular valve body having inlet and outlet ports defining a flow passageway with an annular shoulder intermediate its ends. A pair of discs having orifices therethrough are superposed on the shoulder withone of the discs being angularly rotatable relative to the other. A yoke inserted into the valve body, opposite its outlet port, is anchored to the rotatable disc and impinges it against the fixed downstream disc by a stem bushing surrounding a stem connected with the yoke. The yoke being angularly rotated by a handle secured to its stem end portion projecting outwardly of the valve body opposite the outlet port.

Abstract: An emergency shutoff valve for closing the upstream end portion of a high pressure fluid conductor in the event of unintentional closing the downstream end portion of the conductor is formed by a valve body interposed in the upstream end portion of the high pressure fluid conductor. The valve body contains a valve seat and a normally open valve for seating on the seat and interrupting fluid flow through the valve body in response to fluid pressure above a predetermined value in the conductor. The valve includes a stem slidably supported by and projecting, at one end portion, outwardly of the body. A top plate is secured to the body by posts in axial spaced relation with respect to the valve stem for supporting a pressure collapsible rod-like pin axially interposed between the top plate and the valve stem.

Abstract: A multiple orifice rotatable disc in-line restrictor valve is formed by a cylindrical valve body having a flow passageway therethrough. The valve body is step diameter counterbored from one end for receiving a pair of multiple orifice discs and a disc rotating barrel with one of the discs pinned to the barrel and rotated by a handle projecting radially outward of the valve body through a 90.degree. slot in the body wall for manually positioning one disc relative to the other in orifice mated or mismated position.

Abstract: In a fluid flow restrictor valve having a flow passageway between its ports opened and closed by superposed multiple orifice discs controlled by a yoke connected with one of the discs and having a yoke stem projecting outwardly of the valve body through a valve body bonnet. A sleeve cage nested by a valve body counterbore intersects the passageway and surrounds the yoke and discs. A second sleeve containing a fluid velocity reducing spider is joined to the downstream end of the sleeve cage. The valve bonnet, yoke, sleeve cage, discs and second sleeve form a unitized assembly easily removed from and reinserted into the valve body for repair or replacement of worn valve components without disconnecting the valve body from a flow line. The unitized assembly components are fail-safe indexed with each other, the valve body and valve control to insure a selected open, closed or partially open flow passageway through the valve.

Abstract: A fluid pressure flare relief valve is formed by a valve body having axially aligned inlet and outlet tubular ends forming a passageway adapted to be interposed in a fluid line. The valve body is circumferentially enlarged and provided with a lateral opening normally closed by a double-wall valve head forming a valve head chamber. The enlarged valve body portion contains a box-like chamber integral with the downstream end portion of the valve for communication therewith and normally closing the valve passageway. The chamber forming box member is line drilled to form a pair of apertures normally closed by a pair of pistons mounted on a piston rod. One end of the rod extends outwardly through the valve head. A small diameter piston contained by a cylinder projecting into the valve head surrounds the piston rod and is connected therewith for supporting one end of a pressure release pin having its other end supported by a pin cage.

Abstract: A combination pressure/vacuum relief valve is formed by a closed end cylindrical body having a first port providing communication with a fluid containing vessel and a second port providing communication with the atmosphere. A piston valve within the cylinder is normally seated on a valve seat between the ports with the respective end portions of the piston rod projecting through the closed ends of the cylinder. Each end of the cylinder is provided with a cage supporting a pressure responsive fuse rod interposed between the outwardly projecting end of the piston rod and the opposite end of the cage. When the fluid pressure within the vessel falls below or exceeds a predetermined value, such pressure axially moves the piston valve in a respective unseating direction for providing communication between the interior of the fluid vessel with the atmosphere.

Abstract: In a right angle body fluid flow restrictor valve having a flow passageway between its ports opened and closed by superposed multiple orifice discs controlled by a yoke connected with one of the discs and having a yoke stem projecting outwardly of the valve body through a valve body bonnet. A sleeve cage nested by a valve body counterbore intersects the passageway and surrounds the yoke and discs. The valve bonnet, yoke, sleeve cage and discs form a unitized assembly easily removed from and reinserted into the valve body for repair or replacement of worn valve components without disconnecting the valve body from a flow line. The unitized assembly components are fail-safe indexed with each other, the valve body and valve control to insure a selected open, closed or partially open flow passageway through the valve.

Abstract: In a pipeline road crossing a pipeline is loosely surrounded by a casing under the roadbed with its ends vented to the atmosphere and sealed with the periphery of the pipeline to minimize oxidation of the pipeline wall within the casing. Access and pressure relief valves are connected with the casing vents at opposite sides of the road. This permits injecting gas under pressure into the casing annulus through the valve equipped vents and periodically monitoring the gas pressure.

Abstract: In a multiple orifice body fluid flow restrictor valve having a flow passageway between its ports opened and closed by superposed multiple orifice discs controlled by a yoke connected with one of the discs and having a yoke stem projecting outwardly of the valve body through a valve body top a sleeve cage loosely nested by a valve body counterbore intersects the passageway and surrounds the yoke and discs. The valve body top and sleeve cage forms a unit easily removed from and reinserted into the valve body for repair or replacement of worn valve components without disconnecting the valve from a flow line. The sleeve cage is releasably secured to the valve top in a manner permitting angular rotation of the valve top relative to the valve body and sleeve cage while the latter is nonrotatably secured within the valve body in an axially slidable manner relative to the valve body while threadedly connecting or releasing the valve body top to or from the valve body.

Abstract: In a pressure relief valve, a valve body is provided with an axial bore counterbored from each of its ends to form an inlet port for connection with a container of gas to be monitored and for receiving a valve assembly at its other end opening the valve axial bore in response to the valve being unseated by a predetermined pressure in the container. The valve assembly includes a piston-type valve normally seated in the bore by a collapsible strut or pin interposed between the valve and a plug member secured to the downstream end portion of the valve bore.

Abstract: In a thermal responsive relief valve, an elongated tubular valve body axially contains a strut secured at one end portion to the bore of the valve body and axially contained at its other end by a piston sealed with the valve body bore at one of its ends. A fusible material is interposed between one end portion of the strut and the valve member surrounding the last mentioned strut end portion.

Abstract: In a fluid restrictor valve interposed in a high pressure fluid flow line having a fluid passageway disposed downstream from throttling discs and having a sleeve-like turbulence diffuser nested by the wall forming the fluid outlet passageway, a turbulence diffuser worn out indicator is disposed within a valve wall bore communicating with the periphery of the turbulence diffuser. The indicator includes a piston and rod longitudinally slidable in bores formed in the indicator body. Fluid under pressure against the piston forces the piston rod laterally outward with respect to the wall of the valve for visually indicating a worn out fluid turbulence diffuser.

Abstract: An axially bored valve body having inlet and exhaust ports is provided with a valve movable toward and away from a sealed position in the inlet port at its pressure connected end. A cap closes the end of the body opposite its inlet port. An axially collapsible member is axially interposed between the downstream end of the valve stem and the cap to normally maintain the fluid passageway between the ports closed. Excessive fluid pressure against the valve at the inlet port collapses the collapsible member and unseats the valve to open the fluid passageway.