safety valve

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safety valve,

device attached to a boilerboiler,
device for generating steam. It consists of two principal parts: the furnace, which provides heat, usually by burning a fuel, and the boiler proper, a device in which the heat changes water into steam.
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 or other vessel for automatically relieving the pressure of steam before it becomes great enough to cause bursting. The common spring-loaded type is held closed by a spring designed to open the valve when the internal pressure reaches a point in excess of the calculated safe load of the boiler. Safety valves are installed on boilers according to strict safety regulations.

Safety Valve


a device to ensure the safety of equipment operating under high liquid, gas, or steam pressure when damage to the equipment may result from exceeding the established operating pressure. Safety valves are installed on steam boilers, compressed air receivers, and various technical devices and pipelines operating under pressure. When the pressure in the system rises above the permissible level, the safety valve opens and automatically releases the excess of the working substance, thus preventing an accident. When the pressure is reduced to the permissible level, the safety valve automatically closes. In the USSR, areas of mandatory use, installation, and servicing of safety valves are determined by special laws (seeBOILER INSPECTION).

Safety valves are divided into those loaded by weights and those that are spring-loaded. In the former, the stopper is loaded directly (for low pressures) or by a lever. In spring-loaded safety valves, the pressure of the medium on the stopper is opposed by the force of a spring.


safety valve

[′sāf·tē ‚valv]
(mechanical engineering)
A spring-loaded, pressure-actuated valve that allows steam to escape from a boiler at a pressure slightly above the safe working level of the boiler; fitted by law to all boilers. Also known as safety relief valve.

Safety valve

A relief valve set to open at a pressure safely below the bursting pressure of a container, such as a boiler or compressed air receiver. Typically, a disk is held against a seat by a spring; excessive pressure forces the disk open (see illustration). Construction is such that when the valve opens slightly, the opening force builds up to open it fully and to hold the valve open until the pressure drops a predetermined amount. This differential or blow-down pressure and the initial relieving pressure are adjustable. See Valve

pressure relief valve

In a pressure tank for water storage, a pressure-actuated safety valve that is designed to open and relieve pressure automatically if the pressure within the tank exceeds the value for which it was designed to operate safely.

safety valve

safety valveclick for a larger image
Safety valve: it ensures that the fluid bypasses anytime the pressure builds up beyond designated value.
A form of pressure relief valve that opens to relieve the pressure in the container any time the pressure rises above a predetermined value.

safety valve

a valve in a pressure vessel that allows fluid to escape when a predetermined level of pressure has been reached
References in periodicals archive ?
Dresser Consolidated is one of few safety valve suppliers in the world that can comply with the full scope of products and stringent certifications required for the nuclear power industry.
Safety valves for many industrial applications, especially for the oil, gas, and petrochemical industries, are available for delivery within one week ex stock.
CASE HISTORY -- GULF OF MEXICO A mature well in the Gulf of Mexico developed a leak in the control line of its subsurface safety valve.
This only left the safety valve to relieve the pressure situation, but it failed as scale had accumulated around the valve head and its seat.
Additionally, the companies will collaborate to offer integrated partial valve stroke testing solutions for Safety Instrumented Systems (SIS) through the combination of Neles ValvGuard(TM) safety valve positioners and Honeywell's Fail Safe Controller(R) and Safety Manager(TM).
Limited Tenders are invited for Supply of Complete Safety Valve
Our input is not in there, and there should always be a safety valve,'' Martinez said.
F&S called the Consolidated Maxiflow(R) safety valve for boiler overpressure protection "the power industry standard.
Limited Tenders are invited for Calibration/Testing Of Pressure Safety Valve/Temperature Safety Valve Installated Under Kandla,Samakhiali,Mansarampur And Madanpurkhadar For 2 Years.
It definitely helps morale because it does provide a safety valve (for them).

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