A small-flow valve connected to a fluid process vessel or line for the purpose of bleeding off small quantities of contained fluid.



Related Terms

BLEEDING

A process of removing air from fluid lines or pipes.

HOLDUP

  1. Volume of material held or contained in a process vessel or line. 2. Liquid held up (suspended) in a vertical process vessel or line by rising gas or vapor streams.

DRAIN VALVE

A valve used to drain off material that has separated from a fluid or gas stream, or one used to empty a process line, vessel, or storage tank.

LONGITUDINAL BAFFLE

Baffle sheets or plates within a process vessel (such as a heat exchanger) that are parallel to the long dimension of the vessel; used to direct fluid flow in the desired flow pattern.

MANUAL OIL SHUTOFF VALVE

A manually operated valve in the oil line for the purpose of completely turning on or shutting off the oil supply to the burner.

BYPASS

A pipe or duct, usually controlled by valve or damper, for conveying a fluid around an element of a system.

FILM COEFFICIENT

For a fluid confined in a vessel, the rate of flow of heat out of the fluid, per unit area of vessel wall divided by the difference between the temperature in the interior of the fluid and the temperature at the surface of the wall. Also known as convection coefficient.

ACTUATOR

  1. A mechanism to activate process control equipment by use of pneumatic, hydraulic, or electronic signals; for example, a valve actuator for opening or closing a valve to control the rate of fluid flow. 2. An auxiliary external electrode used to apply a known electrostatic force to the diaphragm of a microphone for calibration purposes. Also known as electrostatic actuator. 3. A device that produces mechanical force by means of pressurized fluid.

THREE-WAY VALVE

Multi-orifice (opening) flow control valve with three fluid flow openings.

PNEUMATIC TEST

Pressure testing of a process vessel by the use of air pressure.

Related questions

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