Abstract： ASME PTC 25:2018 pdf download.Pressure Relief Devices. 2-4 PARTS OF PRESSURE RELIEF DEVICES adjusting ring: a ring assembled to the nozzle or guide of a direct spring valve used to control the opening characteristics and/or the reseat press...

ASME PTC 25:2018 pdf download.Pressure Relief Devices.

2-4 PARTS OF PRESSURE RELIEF DEVICES

adjusting ring: a ring assembled to the nozzle or guide of a direct spring valve used to control the opening characteristics and/or the reseat pressure.

adjustment screw: a screw used to adjust the set pressure or the reseat pressure of a reclosing pressure relief device.

backflow preventer: a part or feature of a pilot-operated pressure relief valve used to prevent the valve from opening and flowing backwards when the pressure at the valve outlet is greater than the pressure at the valve inlet.

bellows: a flexible, pressure-containing component of a balance direct spring valve used to prevent changes in set pressure when

the valve is subjected to a superimposed back pressure or to prevent corrosion between the disk holder and guide.

blowdown ring: see adjusting ring.

body: a pressure-retaining or pressure-containing member of a pressure relief device that supports the parts of the valve assembly and has provision(s) for connecting to the primary and/or secondary pressure source

bonnet a component of a direct spring valve or of a pilot in a pilot-operated valve that supports the spring. It may or may not be pressure containing.

breaking pin: the load-carrying element of a breaking pin nonreclosing pressure relief device.

breaking pin housing: a pressure-retaining component that supports the breaking pin in a nonreclosing pressure relief device.

buckling pin: the load-carrying element of a buckling device.

cap: a component used to restrict access and/or protect the adjustment screw in a redosing pressure relief device. It may or may

not be a pressure-containing part.

diaphragm: a flexible metallic, plastic, or elastomer pressure-containing member of a reclosing pressure relief device used to

sense pressure or provide opening or closing force.

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