Because your process have differents points of operation (flows, pressures) and the pump only one point (intersection curves process and HD pump). We can have others scenarios with a recirculation pipe and control valve.
The heater control valve is used to shut off hot coolant from entering the core when the heater is in the off position. A heater control valve can be actuated by either a vacuum line or a cable from the vacuum heater control valve to the heater core. This hose should be warm; if not the heater control valve is stuck and needs to be replaced
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In boiler feed water line the NRV is normally installed between Pump and stop valve if the line is short and an another NRV is installed at boiler entrance and after stop valve if the line is long or pump is 10 to 15 m away from the boiler.
The vacuum line from the heat control valve typically connects to the engine's intake manifold or a vacuum source, which provides the necessary vacuum for the valve to operate. When the engine is running, this vacuum allows the valve to open or close, regulating the flow of coolant to the heater core based on the desired cabin temperature. Proper routing of this vacuum line is essential for efficient heating and defrosting in the vehicle. If the line is disconnected or damaged, it can lead to issues with temperature control inside the cabin.
To install a T valve for your toilet, first turn off the water supply. Then, disconnect the water supply line from the toilet tank. Attach the T valve to the water supply line and reattach the line to the tank. Turn the water supply back on and adjust the T valve to control the water flow to the toilet.
gate valve is the most suitable in pipe line, because when it is opened full, unobstructed water flow will be there i.e. there is no pressure lose.
In an application of pressure reduction, the warm up valve (bypass valve) is used to warm the steam line, within recommended time frames, before the control valve is placed into operation. A steam control valve should not be used for warm up of a steam distribution line.
there are 2 air lines from tractor to trailer.one line is a control line witch tells the supply or service line how much air to send to the brake pods. the control line is controled by the brake foot valve.
The purpose of the water supply line valve in a toilet is to control the flow of water into the toilet tank, allowing the user to fill and flush the toilet as needed.
Ok, I got the answer to this question. It seems that there is not a heater control valve in the heater hose line.
To replace a water heater gas control valve, first turn off the gas supply and water heater. Disconnect the gas line and pilot tube, then remove the old control valve. Install the new valve, reconnect the gas line and pilot tube, and turn the gas supply back on. Finally, test the water heater to ensure it is working properly.
By using calibrator we can easily calibrate, just we need a air line having pressure of 6 kg as input of control valve. for example : 4mA control valve in close postion 8mA 25% open 12mA 50% 16mA 75% 20mA 100%