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Incorrect setting of water supply pressure will affect the normal operation of the water system, if the water supply of the system is insufficient, a large amount of air will directly threaten the operation of the pump and the host, and will lead to the failure of the entire air conditioning system.

User profile

▶ At present, due to the requirements of energy saving and operation reliability, the central air conditioning system basically adopts closed expansion water system. There are two forms of closed expansion water system. One is the use of open expansion water tank, which should be placed at the highest point of the water system, and the liquid level of the expansion water tank can be controlled through the float ball valve to refill and discharge water.

▶ The other is the use of pressure expansion water tank, can be placed anywhere in the water system, usually on the return water end, does not affect the beauty of the building, through the automatic water refill device according to the pressure in the system, overpressure through the pressure relief valve (safety valve) pressure relief. For small and medium-sized air conditioning systems, automatic water refill valves are usually used for constant pressure water refill, which is simple to control, low cost and easy to install, which is also a widely used way of water refill. However, the incorrect water supply pressure may lead to the water system can not be replenishment, there is a large amount of air in the system, which directly leads to pump cavitation, insufficient water flow, and serious heat exchanger junction.

Disadvantages of traditional automatic water refill valve in closed expansion water system

▶ The automatic water refill valve usually does not have the pressure setting opening, and the user cannot set the water refill pressure on site, which often leads to incorrect water refill pressure setting, resulting in the failure of normal water refill. There is a large amount of air in the water system, which seriously threatens the operation of the main engine and directly leads to the failure of the main engine. Because the responsible person cannot be determined, only the equipment manufacturer bears the responsibility for the equipment failure.

▶ Automatic water supply valve with dial type pressure setting scale, because the dial value dial is easy to misoperate, resulting in the pointer indicating the wrong pressure setting value, and the consequences caused by misleading the user are more serious than those without scale.

Vertical scale visual adjustment of the advantages of automatic water refill valves in closed expansion water systems

▶ With vertical pressure scale value display, the site can be free to set the water supply pressure according to the tap water pressure and the static pressure of the pipeline at the installation of the water supply valve, usually the set value is less than the tap water pressure, greater than the static pressure of the installation point to normal water supply, because of the vertical scale, the user has only one adjustment point, will not cause misaction, the user set the indicated scale value is the water supply pressure.

▶ Anti-boring design, the user set the water supply pressure, even if the automatic water supply valve is completely disassembled and re-installed, the pressure set value will not change, and the dial scale must be calibrated by the manufacturer through professional instruments to restore the user's set value.

▶ National patent, the world's first, verified by many air conditioning manufacturers are superior to foreign imported products.

Vertical scale visual adjustment automatic water refill closed expansion water system solution application

▶ This solution was launched in 2005, immediately welcomed by the world's famous central air conditioning manufacturers, water supply pressure can be controlled by the user according to the site situation, reducing the system water shortage caused by various problems, reduce the failure rate of air conditioning equipment. At present, it is widely used in ground source heat pump, air cooled heat pump, heating and hot water field.

▶ Automatic water refill valve with stainless steel flange expansion tank (no rust) and pressure relief valve to form a complete solution, is also the three indispensable components of pressure expansion water system.