A valve that has one seat which provides a seal, and a bleeder line and valve that are tapped into the block valve's bonnet.

A valve that permits fluid to flow in one direction only.

A pressure relief valve that has its closing force provided by a spring.

An arrestor which is a trap over an opening, e.g. of a ventilation system or a pipe, to prevent flames from entering the system.

A pressure relief valve that uses a pilot valve to indirectly activate the main valve.

A non-reclosing pressure-relief device actuated by the static differential pressure between the inlet and outlet of the device.

A physical object that is a pressure relieving device designed to burst at a calibrated pressure to prevent pressure in systems or vessels from reaching unsafe levels.

Pipework/channel/scupper designed to flow storm water (i.e. arising from atmospheric precipitation) from source areas on site to a discharge or outflow point (excludes drainage from bunded area)

A relief valve that is used for pressure compensation purposes by admitting (letting in) a pressure to prevent that vacuum is forming when filling or emptying a system.

A container intended for storage and/or processing of fluids.