Adjustable Industrial Valves can through the downstream outlet pressure and along with the change of it up or down its own small valve port, thus changes the diaphragm ( The piston) Upper stem pressure chamber, restrict the adjustment of the valve disk position. Indispensable to add filter net, regular check repair and set the by-pass pipe. When entering the diaphragm ( The piston) Stem above the indoor pressure downstream of the water is discharged into atmosphere, or low pressure area, utility in the bottom of the valve plate above and below the diaphragm of the pressure value is greater than the pressure value, so the main valve disc to rev. The location of the full paper; When entering the diaphragm ( The piston) Upper stem indoor pressure downstream of the water can not be discharged into atmosphere, or low pressure zone, utility in the diaphragm ( The piston) At the top of the pressure value is greater than at the bottom of the pressure value, so will reduce the pressure of the main valve disc to the absolute closed position; When the diaphragm ( The piston) Upper stem indoor pressure value in the inlet pressure and outlet pressure halfway, the main valve disc is in adjustment, adjust the position is determined by the needle valve in the duct system and adjustable pilot valve to the conjugate. With what is said above, the special nature of the valve near the valve disc movement speed, not prone to boil the water hammer shock, close to full closed, valve action quickly, the better, the less Marine valve and throttle device can be installed on the disc. Additional pilot valve throttle and local to try our best to prevent Settings, small-bore orifice, avoid congestion. Pilot Industrial Valves along with the change of liquid level and pressure of the medium movement, because the pilot valve category is numerous, can be used alone or combined several applied, can make the main valve in the water and the water pressure and flow rate of single and compound such as regulating function. Roughly similar to the main valve body by the Industrial Valves, the valve when the whole paper, the pressure loss is much larger than the other valves, and all the more opening loss coefficient and near full close condition, the surge in the front of the valve diameter is larger, the more significant. It consists of a main valve and attached setting catheter, needle valve, ball valve and pressure gauge, etc, on the basis of using the target, function of place, can reduce pressure becomes remote sensing floating ball valve, valve, slow close check valve, flow stem, relief valve, water power electric stem valves, tight shutoff valves, etc. Hydrodynamic stem valve based on the structure and the stem is different form, can be divided into the following kinds: remote sensing floating ball valve ( Stem level) , to reduce the pressure valve, slow close check valve, flow stem valve, holding pressure/pressure relief valve, water power electric stem valves, water pumps, stem valves, differential bypass valve, tight shutoff valves, and so on. Hydrodynamic stem valve based on pressure pipeline media power, execute, regulating valve opening and closing. Q: hydrodynamic stem valve principle of classification and analyzes a: hydrodynamic stem valves according to the structure can be divided into two categories, the diaphragm and piston, office principle is the same, is more than the downstream pressure difference delta P, by the pilot valve stem, make diaphragm ( The piston) Hydrodynamic semi-automatic hydraulic differential operation, the absolute by adjustment, and therefore make full of the main valve disc paper or absolute closed or in the condition adjustment. 。 Intermediate partition membrane type and hydrodynamic stem valve piston type two kinds, office principle is the same, is more than the downstream pressure difference, pilot valve stem, make diaphragm ( The piston) Hydraulic differential operation, the absolute by hydrodynamic semi-automatic adjustment, so that the main valve disc and complete paper or absolute closed or in the condition adjustment. Notes to the order: The national standard) A, A: B: product name, model, nominal size medium and temperature, pressure range C: whether there is attachment, delivery time, and special requirements so that we can correct selection for you. Second, if the valve has been selected by design unit of our company model, please order according to the valves parameters directly with our sales center. Three, it is very important when you use the occasion or the environment is more complex, would you please provide design drawings and detailed parameters, our engineers experts will concentrate on review and analysis for you. We can provide you with professional solutions, including design, customization, complete, operation and service. We've been working on the valve leader in the field of industry, to provide you with the latest knowledge of the valve, the best service, best technical adviser. 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