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Pressure relief valves are mechanical devices that open when the pressure in a system exceeds a predetermined limit. They close again when the pressure returns to a stable level. 

A non-return valve allows a medium to flow in only one direction and is fitted to ensure that the medium flows through a pipe in the right direction, where pressure conditions may otherwise cause reversed flow.

Screwed Female Ends to IS 554 / BS 21 / ISO 7. Full Bore, Two Piece Design. Quarter Turn, Lever Operated. Provided with Forged Brass Hard Chrome Plated Ball. Premium Quality PTFE Gland Packing and Seating.

Ball valve is the most used fluid shutoff valve in upstream oil and gas production facilities, both onshore and offshore. They are also used in fuel gas systems feeding furnaces. Plug valves present the following advantages: Resistance to high pressure.

Check valves are installed where different components need to be isolated, or restriction of flow through a component in one direction only is required

Butterfly valves are quarter-turn rotational motion valves that are used to shut off flow or interrupt the flow of a product. They are generally smaller and lighter than other types of valves, and are easy to operate by handles, gears, or actuators.