Which valves will be used in the air conditioning water system

In the air conditioning water system, gate valve, butterfly valve, ball valve, globe valve these four kinds of valves will be used

Gate valve: mainly used for all kinds of breakpoint, widely used; The air conditioning water system uses soft sealing gate valve, the valve disc is fully coated with glue, and the seal is reliable. The maximum caliber can be up to DN1400, in the 16 kg pressure pipe, better sealing than butterfly valve. Cast steel gate valve, stainless steel gate valve does not conform to the standards of the Ministry of construction, not suitable for building water system, mostly used for high temperature and high pressure, oil, gas medium. Butterfly valve: connection form: clamp or flange; Seal: EPDM (0-100℃); NBR(0-800℃); Manual drive form: below DN200, handle type; Above DN200, turbine type is recommended;

It is recommended to use the wafer butterfly valve: the wafer butterfly valve can be bidirectional pressure, it is not recommended to use the eccentric butterfly valve; Under pressure above PN16, it is not recommended to use butterfly valve; The butterfly valve should not be used below DN50, and the cut-off valve can be used.

Air conditioning water system is not suitable for metal hard seal butterfly valve or teflon butterfly valve, air conditioning water system uses rubber soft seal butterfly valve, generally using ductile iron valve body, wafer butterfly plate; EPDM rubber temperature up to 100℃, can fully meet the requirements of heating, air conditioning systems.

Condensation is inevitable when the temperature difference between humid environment, pipeline medium and ambient temperature is large. It is not only easy to rust the valve, make the electric and manual actuators fail, but also affect the working and living conditions of the site because of dripping. Therefore, on the air conditioning water system, the anti condensation butterfly valve is also one of the common valves.

Globe valve: high resistance, reliable shutdown, large volume; Metal seal, rubber seal, the production process is simple; In the valve off, the resistance is large, but can be manual flow regulation, if necessary, can play the role of manual balance, and anti-cavitation ability is strong; DN50 and below are mostly threaded connections; Pay attention to the direction of water flow; The cut-off valve should not be used above DN200, because the turn-off force is too large, and the manual can hardly be turned off.

Ball valve: DN50 and below the full copper body wire connection, the ball is stainless steel, the sealing ring is tetrafluoride.