A timed interval when with the ignition means proved, the main valve is permitted to remain open. If the main burner is not ignited during this period, the main valve and ignition means are cut off. A safety switch lockout follows.


Related Terms

SEA VALVE

A shut off valve through the hull for intake or discharge piping.

GAGE VALVE

A valve attached to a water column or drum for checking water level.

TRY VALVE

One of three valves mounted on a boiler or water column within the visible range of the gauge glass and used to check the water level.

POPPET VALVE

A cam-operated or spring-loaded reciprocating-engine mushroomtype valve used for control of admission and exhaust of working fluid; the direction of movement is at right angles to the plane of its seat.

PNEUMATIC CONTROL VALVE

A valve in which the force of compressed air against a diaphragm is opposed by the force of a spring to control the area of the opening for a fluid stream.

PNEUMATIC CONTROLLER

A device for the mechanical movement of another device (such as a valve stem) whose action is controlled by variations in pneumatic pressure connected to the controller.

PLUG VALVE

A valve fitted with a plug that has a hole through which fluid flows and that is rotatable through 90 for operation in the open or closed position. Also known as plug cock.

PISTON VALVE

A cylindrical type of steam engine slide valve for admission and exhaust of steam.

PENSTOCK

1. A valve or sluice gate for regulating water or sewage flow. 2. A closed water conduit controlled by valves and located between the intake and the turbine in a hydroelectric plant.

OVERRIDING PROCESS CONTROL

Process control in which any one of several controllers associated with one control valve can be made to override another in accordance with a priority requirement of the process.

Related questions

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