Why do not open the valve speed switch? In the pipeline quickly open and close the valve, it will have a water hammer phenomenon, in the pipe close to the valve produced a water hammer pressure value. It is calculated that for every 1 m / s change in liquid flow velocity in the pipe, the pressure generated by the liquid can reach 1 MPa. Not only this pressure value is also propagated upstream in the form of a water surge wave from the pipe segment close to the valve at a speed close to the sonic velocity The speed of the sound in the water is 1500 m / s, and the speed in gasoline is 1100 m / s), it is possible to rupture the pipe by superimposing it with the original pressure at each point along the pipe. Slow, gradually opening and closing the valve, due to the instantaneous time, small changes in speed, the pressure generated by the initial pressure is small, and because of the extension of time, the water shock wave propagation to the upstream, will produce a reflected wave, and thus offset The initial pressure of water hammer, so to avoid the pipeline overpressure accident. Valve is not strict processing methods? 1) Reason: there are debris in the medium, solid particles pad between the valve flap and seat. Valve stem and the valve is not good, so that the valve disc and valve seat can not be closely linked to the deviation. 2) Treatment: to ensure the media clean, if the valve is closed when the valve is found plugged phenomenon, not hard and hard off, you can quickly switch several times, so that pad stuff rushed out. Often to the stem and stem nut plus lubricant, to ensure that the valve switch flexible. Valve can not open, the reason is closed and what is the treatment? I) The reason: there is debris or mismatch between the stem and the stem nut, the stem and the valve disc are separated, the stem and the stem nut are corroded, the valve disc is stressed too much and the packing is too tight. 2) Approach: often to the stem and stem nut lubrication and debris removal; stem and valve from the detachment should be carried out overhaul; valve force is too large, when the buck after opening the valve. My factory is commercial induction cooker manufacturer, produce induction cooker 3500w,5000w induction cooker,induction wok cooker commercial,hot pot induction cooker and so on. OEM ,ODM for many customers. commercial induction cooker,induction cooker 3500w,5000w induction cooker,induction wok cooker commercial Guangdong Puda Electrical Appliance Co., Ltd. , https://www.pokaeleca.com
Do not switch the valve speed when the reason for the speed and the valve off the handle
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