原文：
暖通空调管道用阀门的选型设计 1、冷冻水机组、冷却水进出口设计蝶阀； 2、水泵前蝶阀、过滤器， 水泵后止回阀、蝶阀； 3、集、分水器之间压差旁通阀； 4、集、分水器进、回水管蝶阀 5、水平干管蝶阀； 6、空气处理机组闸阀、过滤器、电动二通或三通阀 7、风机盘管闸阀（或加电动二通阀） 注：一般采用蝶阀时，口径小于150mm时采用手柄式蝶阀（D71X、D41X）；口径大于150mm时采用蜗轮传动式蝶阀（D371X、D341X）。 选用暖通阀门的注意事项： 1、减压阀、平衡阀等必须加旁通阀; 2、 全开全闭{zh0}用球阀、闸阀； 3、暖通空调管道尽量少用截止阀； 4、阀门的阻力计算应当引起注意； 5、电动阀一定要选好的。 给水管道上使用的阀门的选型原则 1、需调节流量、水压时，宜采用调节阀、截止阀； 2、要求水流阻力小的部位（如水泵吸水管上），宜采用闸阀； 3、安装空间小的场所，宜采用蝶阀、球阀； 4、水流需双向流动的管段上，不得使用截止阀； 5、口径较大的水泵，
出水管上宜采用多功能阀。 止回阀设置要求： 1、引入管上； 2、密闭的水加热器或用水设备的进水管上； 3、水泵出水管上； 4、进出水管合用一条管道的水箱、水塔、高地水池的出水管段上。 注：装有管道倒流防止器的管段，不需再装止回阀。 止回阀的阀门类型选择： 应根据止回阀的安装部位、阀前水压、关闭后的密闭性能要求和关闭时引发的水锤大小等因素确定，应符合下列要求： 1、阀前水压小的部位，宜选用旋启式止回阀、球型止回阀和梭式止回阀。 2、关闭后密闭性能要求严密的部位，宜选用有关闭弹簧的止回阀。 3、要求削弱关闭水锤的部位，宜选用快速关闭消声止回阀或带有阻尼装置的缓闭止回阀。 4、止回阀的阀掰或阀芯，应能在重力或弹簧力作用下自行关闭。 给水管道的下列部位应设置排气装置： 1、间歇性周期使用的给水管网，其管网末端和{zg}点应设有自动排气阀。 2、给水管网有明显起伏积聚空气的管段，已在该段的峰点设自动排气阀或手动阀门排气。 3、气压给水装置，当采用自动补气式气压水罐时，其配水管网的{zg}点应设自动排气阀。

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译文：
HVAC piping design with valve selection 1, chiller plant, cooling water between inlet valve design; 2, before the butterfly pumps, filters, pumps after the check valve, butterfly valve; 3, sets, water separator pressure differential between the bypass valve; 4, set, divider into the returning pipe valve 5, the level of dry pipe valve; 6, valve air handling units, filters, electric two-pass or three-way valve 7, fan coil valve (or plus electric two-way valve) Note: The valve is typically used when the diameter is less than 150mm used Handle Butterfly Valve (D71X, D41X); diameter greater than 150mm used worm drive butterfly (D371X, D341X). Select Valve HVAC Note: 1, valve, balance valve bypass valve must be added such as; 2, closed all the best with the ball valve fully open, valve; 3, minimize the use of HVAC pipe valve; 4, valve resistance should be calculated to attract attention; 5, the electric valve must be selected for. Water supply pipeline valves used on the principle of selection 1, need to adjust the flow, water pressure, the appropriate use of control valve, globe valve; 2, flow resistance of the parts required (such as pump water pipe), should adopt the valve; 3, place a small installation space, should adopt the butterfly valve, ball valve; 4, be two-way flow of water pipe, the valve may not be used; 5, larger-caliber pump outlet pipe on the appropriate use of multi-function valve. Valve settings required: 1, the introduction of tube; 2, closed water heater or water device inlet; 3, outlet pipe on the pump; 4, combined with a pipe and out of water tanks, water towers, high pool outlet pipe segment. Note: with pipe pipe backflow prevention devices, without re-installed check valve. Valve valve type selection: Check valve installation site should be based on the valve before the water pressure, closed airtight performance requirements on and off the water hammer when the trigger factors determine the size, shall meet the following requirements: 1, before the pressure valve a small part, should choose swing check valves, ball check valve and shuttle valve. 2, closed tightly closed position performance requirements, should use a check valve closing spring. 3, required closure of the water hammer undermine the site, should be selected or the quick closing valve silencer damping device with slow closing check valve. 4, check valve or spool valve broke off, should be able to spring force of gravity or under their own close. Water pipes should be set to exhaust the following sites: 1, intermittent use of water supply network cycle, the pipe end and the highest point should be equipped with automatic exhaust valve. 2, water supply network significantly the accumulation of air in the pipe rolling, has a peak point in the section set automated or manual exhaust valve exhaust valve. 3, pressure water supply device, when using automatic qi-type pressure tank, its highest point of Water Distribution Network exhaust valve should be set automatically.