Hvac pipe valve type selection design of cooling water, chilled water units, import and export 1 design butterfly valve; After the butterfly valve, filter before 2, water pump, water pump check valve, butterfly valve; 3, set, and the differential bypass valve between water segregator; 4, set, manifold and return pipe butterfly valve 5, horizontal main; 6, air handling unit gate valves, filters, electric two-way or the 3-way valve (pos. No. 7, fan coil gate ( Or add electric two-way valve) Note: when the butterfly valve is used, commonly used when diameter less than 150 mm lever type butterfly valve ( D71X D41X) ; Diameter greater than 150 mm when the worm gear drive type butterfly valve ( D371X D341X) 。 Select hvac Industrial Valves note: 1, pressure reducing valve, balance valve and so on must add bypass valve; 2, fully open full close best ball valve, gate valve; 3, hvac duct valve use less as far as possible; 4, the resistance calculation of valve shall be noticed; 5, electric valve must choose good. Principle of type selection of water supply pipeline valves used on 1, need to adjust the flow rate, pressure, appropriate USES regulating valve, globe valve; 2, request flow resistance small parts ( Such as water pump suction pipe) Gate valves, appropriate USES; 3, small installation space, appropriate USES butterfly valve, ball valve; (4), water should be two-way flow section, shall not be used as valve; 5, large diameter of the pump, appropriate USES multifunctional valve outlet pipe. Check valve set requirements: 1, the introduction of pipe; 2, closed on the inlet pipe of the water heater or water equipment; 3, on the water pump outlet pipe; 4, share a pipeline in and out of the water tank, water tower, highland pool water section. Note: a section of pipeline backflow, do not need to install the check valve. Check valve valve type choice, should according to the installation site of the check valve, following the closure of the valve before the water pressure, the sealing performance and closing caused by water hammer factors determine the size, shall meet the following requirements: 1, before the valve hydraulic parts, appropriate chooses the swing check valve, ball check valve and shuttle check valve. After 2, close tightly sealed performance requirements, appropriate chooses close spring check valves. 3, close the undercut area of water hammer, appropriate chooses fast shut silencing check valve or slow close check valve with a damping device. 4, check valve, valve break or valve core, should be under the action of gravity and spring force to shut down. Water supply pipeline exhaust device shall be set up of the following parts: 1, using intermittent cycle of water supply pipe network, the and the highest point at the ends of pipe shall be the automatic exhaust valve. 2, water supply pipe network has obvious fluctuation accumulated air section, has been set in the peak point of the this automatic exhaust valve or manual exhaust valve. 3, pressure water supply device, when using automatic fill gas pressure tank, the the highest point of the water distribution network should be set up automatic exhaust valve. In this paper, the keyword search: more technical articles valve product supply information
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