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The amount of steam, in kilograms per hour, a safety valves can discharge.

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FILTER RATED CAPACITY

The amount of contaminants a filter will hold before an excessive pressure drop is caused. Some filters have bypass valves which open when a filter reaches its rated capacity.

CONDENSING UNIT SERVICE VALVES

Shutoff valves mounted on condensing unit to enable service technicians to install and/or service unit.

GAUGE MANIFOLD

Chamber device constructed to hold both compound and high-pressure gauges. Valves control flow of fluids through.

FULL ARC ADMISSION

In full-arc admission, all regulating valves open but only at a percentage of their full opening. With load increase, they all open more fully. This provides more uniform heating around the high-pressure part of the turbine. Most modern controls start with full-arc and switch to partial arc to reduce throttling losses through the valves.

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.

PARTIAL ARC ADMISSION

In multi-valve turbine inlets, partial arc ad mission allows the steam to enter per valve opening in a sequential manner, so as load is increased, more valves open to admit steam. This can cause uneven heating on the high-pressure annulus as the valves are individually opened with load increase.

TURBINE RELIEF VALVE

The turbine casing is fitted with spring-loaded relief valves to prevent damage by excessive steam pressure at the low-pressure end if the exhaust valve is closed accidentally. Some casings on smaller turbines are fitted with a sentinel valve, which serves only to warn the operator of over-pressure of the exhaust end. A spring-loaded relic valve is needed to relieve high pressure.

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.

POSTPURGE

A period after the fuel valves close during which the burner motor or fan continues to run, to supply air to the combustion chamber.

SAFETY VALVE DRAIN

A hole of at least 3/8 in diameter required through the body below the valve-seat level in safety valves larger than 2-in diameter; used to prevent condensate from collecting at this point.
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