If press the actuator using power, regulating valve can be divided into pneumatic, electrical, fluid movement three, namely to compressed air to power sources pneumatic - valve, with electricity as the power source of electric control valve, liquid medium ( Such as oil, etc. ) Pressure as the power of electric hydraulic control valve, additional, according to its function and the nature of the special points, and electromagnetic valves, electronic style, smart, always present linear regulator, etc. There are four that are positive (combination Gas closed type) , positive and negative, Gas type) , namely, Gas type) And reflect ( Gas closed type) , through the combination of four regulator utility form galls both on and off. Actuator type does recognize on the actuator output force confirmed, accordance with the requirements of process using background, choose the corresponding actuator. For utility regulator Marine valve form selection, thinking problems mainly from three aspects: a) Produce process safety; b) The special property of the medium; c) Volume, yield and quality guarantee economic loss is minimal. Thinking from the aspects of energy saving problem, should try to choose electric actuators. For the presence of explosion-proof requirements, should choose pneumatic actuators. actuator selection in order to make the valve normal office, with the implementation of the mechanism to be up enough to ensure high output tightly closed and open the valve. Q: stem of the valve body type selected recommend a: regulator is called stem valves, is the main type of actuator, after acceptance regulation unit output of stem signals, from engine operation to change fluid flow. ( 5) Avoid flash flash and cavitation and cavitation only initiation in liquid medium. Regulator of ordinary consists of actuators and valves. Utility of energy volume has nothing to do with its direction, because of this, choose the actuator is the key to find out the biggest output force and rotational torque of the motor. For single utility of pneumatic actuators, the output force associated with the opening of the valve, regulating valve on the show will also affect the force movement special nature, because this requirement in the whole regulator set force equilibrium of the opening range. If high controlling precision, can choose hydraulic actuators. Regulator form of utility to pick the regulator utility form only have when choosing pneumatic actuators, its utility form through positive and negative utility and the positive and negative effect of combination valve actuator. ( 3) Corrosion medium have corrosive because it is over, try our best to choose structure simple valves. ( 2) Abrasion resistance when fluid medium is including high abradability and particle suspension liquid concentration, valve lining material to be strong and hard. Such as power plants transparent machine speed regulation, the refinery play device of temperature regulation of the acoustic. Regulating valve body type choose regulating valve body category is numerous, commonly used is through single-seat, direct two-seater, angular, diaphragm, small flow, tee, injustice, butterfly, sleeve, spherical, etc. In specific, when choosing to do thinking problem described in the paper are as follows: ( 1) Main valve core style structure according to the flow of special properties of the selected factors to think problems such as unbalanced force and injustice. 。 ( 4) Medium temperature, pressure, when the medium temperature, high pressure and change is big, should choose the valve core and valve seat materials by temperature, pressure changes small valves. For double use of pneumatic, hydraulic, electric actuators, ordinary didn't reset spring. In the process of actual yield, flash and cavitation can form oscillation and noise, reduce the use of the valve the survival of the fixed number of year, because this should be avoided when selecting the valve valve initiation flash and cavitation. 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. Thank you for visiting our website, if you have any questions, you can call us, we will be dedicated to provide you with quality services. The factory provides professional ball valve, butterfly valve, gate valve, globe valve, check valve, relief valve, safety valve, Marine valve, oil Industrial Valves, hydraulic control valve and other kinds of valves.
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