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A valve used to stop the flow of steam to the cylinder of a steam engine.



Related Terms

NON-RETURN VALVE

A check valve that can be manually closed to prevent the back flow of steam from a header to a boiler.

MULTI-PORT GOVERNOR VALVE

In large turbines, a valve controls steam flow to groups of nozzles. The number of open valves controls the number of nozzles in use according to the load. A bar-lift or cam arrangement operated by the governor opens and closes these valves in sequence. Such a device is a multi-port valve. Using nozzles at full steam pressure is more efficient than throttling the steam.

ZONE VALVE

A valve that regulates the flow of hot water or steam in a control zone or heating unit of a building.

GOVERNOR SAFETY STOP

On throttling-type governors, the safety stop is a weighted arm that needs the support of a governor belt. If the belt breaks, the idler arm drops and shuts the steam supply valve to the engine. On Corliss units, the flyballs fall to the lowest position and knock off the safety cams; the cams disengage the catch blocks on the steam intake valves so that no steam is admitted to the engine.

GLOBE VALVE

A stop valve using the round-disk-and-seat principle. Used where the fluid controlled is comparatively clean.

SLUG

A solid body of boiler water passed into the steam flow by priming or picked up from a pocket of condensate in the steam line.

PISTON VALVE

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

HYDRODYNAMIC OSCILLATOR

[ENG ACOUS] A transducer for generating sound waves in fluids, in which a continuous flow through an orifice is modulated by a reciprocating valve system controlled by acoustic feedback.

INLET VALVE

The valve through which a fluid is drawn into the cylinder of a positive-displacement engine, pump, or compressor. Also known as induction valve.

CONE VALVE

A divergent valve whose cone-shaped head in a fixed cylinder spreads water around the wide, downstream end of the cone in spillways of dams or hydroelectric facilities. Also known as Howell-Bunger valve.

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