A ball valve that is equipped with an actuator that manipulates a stream of fluid in the response to a signal from an external sensing element and with input of energy from an external source.

A rotary valve that has a ball closure member.

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 can be used for rapid depressurizing of a high pressure system.

A butterfly valve that is equipped with an actuator that manipulates a stream of fluid in the response to a signal from an external sensing element and with input of energy from an external source.

A rotary valve that has a closure member of a disc type with a shaft parallel, or near parallel, to the plane of the disc, with an axis of rotation transverse to the flow direction.

A protective device used to protect equipment (e.g. riser pipes and submerged pumps) against environmental exposure.

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

A choke valve that is equipped with an actuator that manipulates a stream of fluid in the response to a signal from an external sensing element and with input of energy from an external source.

A valve that can be used to obstruct the fluid passing inside, and has the ability to reduce the pressure from the inlet port to the outlet port.

A valve that can be used to modify (regulate) the fluid flow rate in a process control system. It usually includes an actuator, which responds to a signal from the controlling system and changes the position of the flow controlling element in the valve.

A control valve that is intended to operate at high temperature, and admit water into a deluge system.

A diaphragm valve that is equipped with an actuator that manipulates a stream of fluid in the response to a signal from an external sensing element and with input of energy from an external source.

A membrane valve that is a membrane valve where the closure member is a resilient diaphragm being forced against a port.

A 'device' that is providing diversion of something from an expected course or direction.

A block and bleed valve that is incorporating two seats, each of which provides a seal, and a means of venting the space between the seats. The seats may isolate with the pressure differential acting in the same or in opposite directions depending on the design.

A valve that is intended for subsurface control/check operation.

A control valve that uses a rotating disc as closing element, and with a design that causes the disc to take a slightly eccentric path during actuation.

A valve that has a closing member which is an eccentric rotating disc.

A valve that is assigned to act in case of emergency.

Flexible joint between two pipes to receive expansion from the pipes.

A regulator that normally use the differential pressure principle across an orifice to control the valve trim and regulate flow.

A control valve that is a gate valve and an actuated valve.

A valve that is a valve where the closure member is a gate or disc with a linear motion parallel, or nearly parallel, to the plane of flat seats, which are transverse to the direction of flow.

A control valve that is a globe valve and an actuated valve.