One is feed valve and the other one is check valve.
Feed water check valve.
It consist of a non return valve water inlet pipe outlet pipe spindle wheel and gland as shown in figure.
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The check valve doctor specializes in preventing check valve problems and failures.
Dft s in line spring assisted check valves prevent water hammer and reverse flow.
A main feed water control valve is designed.
Feed water control valves are one of the most important control components of the water steam circuit.
Water feeders pressure regulators for heating equipment.
Feed check is a combination of 2 valves in one.
The outlet pipe of valve is connected with the delivery pipe of feed pump.
The function of feed valve is to allow or stop the supply of water to the boiler.
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To protect against this the feedwater valves are sized for minimal pressure drop allowing the maximum amount of water to flow to the drum.
The valve controls the supply of feed water to the boiler.
Check valves are also used in the pumps that supply water to water slides.
The pressure drop across the valve should be minimized but still give a l good control characteristic.
Integrated water hammer arrestor is designed to protect plumbing systems and fixtures from water hammer.
The feed pumps or injectors which supply water to steam boilers are fitted with check valves to prevent back flow.
At this point the normal feedwater inlet pressure to the high pressure h p drum level control valve is nearly 2400 psig.
The feed check valve is fitted in to the water space of the boiler just below the normal level of the water.
The water feed line piping valves and fittings from the required check valve to the feed pump shall have a pressure rating of not less than the pressure required to feed the boiler but never less than 100 psi.
The check valve is automatic in operation and its function is sto.
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The water feed line shall be equipped with a check valve and stop valve between boiler and check.
Hot water heating boilers steam boilers are also protected from water loss by several types of automatic water feed valves that add water to the heating system when needed.
