It is not.. A globe , needle , ball valve are used for throttling
For expansion either a shock absorber , diaphragm tank or air chamber are used to allow for expansion
Never. Throttling will erode the valve seat and then the valve will never shut off completely.
Yes. The expansion loop is only there to take up the thermal expansion of the pipe run, installing a valve will not impede the action of the loop.
There has to be a built in expansion chamber or release valve. Otherwise the expansion would cause an explosion.
Triple duty valves combine the features of a check valve, a throttling valve, and a shut-off valve, and are designed for installation on the discharge side of centrifugal pumps. The convertible body design allows the triple duty valve to be changed on-site from a straight configuration to an elbow configuration. They prevent the end user from having to purchase many different types of valves separately, this saves money in materials and uses limited floor spacing.
In dray expansion evaporator, the liquid refrigerant is generally fed by an expansion valve. the expansion valve controls the rate of flow of refrigerant to the evaporator. In the evaporator the liquid refrigerant is vaporized and superheated by the time it reaches to the end of evaporator. At inlet of the evaporator, the refrigerant is predominantly in the liquid form with a small amount of vapor formed as a result of flashing at the expansion valve. the liquid refrigerant passes through the evaporator, more and more refrigerant is vaporized by the load. according to the load, the liquid will come into evaporator and vaporize and reaches to superheat at the end of the evaporator. The inside of the evaporator is far from dry but wetted with liquid so named as dry expansion evaporator.
Never. Throttling will erode the valve seat and then the valve will never shut off completely.
Never ever use a Gate type of valve for throttling ONLY a globe pattern is designed for this purpose and a needle valve
The throttling devise can be the valve or the copper tubing that allows the flow of the refrigerant through very small opening also called as the orifice. The throttling devices allow restricted flow of the refrigerant. The throttling devices are also called as the expansion valves because when the refrigerant passes through them the pressure of the refrigerant drops down or it expands..Capillary tube is one of the most commonly used throttling devices in the refrigeration and the air conditioning systems. The capillary tube is a copper tube of very small internal diameter. It is of very long length and it is coiled to several turns so that it would occupy less space. The internal diameter of the capillary tube used for the refrigeration and air conditioning applications varies from 0.5 to 2.28 mm (0.020 to 0.09 inches). Capillary tube used as the throttling device in the domestic refrigerators, deep freezers, water coolers and air conditioners.
A gate valve is positive shut off and used for on of off . A globe valve is for throttling
Globe is used for throttling
There is no expansion valve. The metering device is called a expansion valve should be located in the small line on the condenser it will be located near the line at the connection
Ball-joint shut off
You cannot increase steam pressure through a valve without adding heat to it. Throttling steam always reduces its pressure.
No, it is not. It may cause cavitation.
That would depend on the application such as high steam pressure and if throttling is needed
Yes but, it is called an orifice tube.
where is the expansion valve located