Have a friend let me share the regulator related application, after several hours of effort to summarize experience of small to share with you,
Regulating valve description
First of all let us easy to understand the regulating valve, regulating valve to control valve series, the main effect is to adjust the medium pressure, flow rate, temperature and so on parameters, is the final control element in the process the loop, the regulator in the modern factory automation control plays a very important role, the production of the factory depends on the correct flow of the liquid and gas distribution and control, the control of both the exchange of energy, low pressure or is a simple container loading, will need the final control elements to complete, the final control element can be thought of as the automatic control of physical energy, the regulator of low energy level and high level necessary for the execution of flow fluid control function, and between the final control element to complete the necessary power amplification effect, and the regulator is the most widely used type of final control element,
Function variable resistance of the regulating valve in the pipeline, its change process fluid turbulence scale, or in the case of laminar flow provide a pressure drop and pressure drop is caused by resistance change valve or "friction", the pressure to reduce process is usually called "throttling", for gas, it is close to the isothermal adiabatic condition, deviation depends on the degree of non-ideal gas (joule Thomson effect), in the case of liquid, pressure is turbulent or viscous friction consumed, both of which put pressure is converted into heat energy, result in higher temperature slightly,

Regulating valve type
Regulating valve according to the itinerary features can be divided into: straight stroke and stroke, straight trip including: single-seat valves, two-seat valves, sleeve valve, Angle valve, three-way valve, diaphragm valve; Quarter-turn include: butterfly valve, ball valve, eccentric rotary valve, fully functional ultra light valve, regulating valve drive mode can be divided into: according to the pneumatic control valve, electric control valve and the hydraulic control valve; By adjusting the form can be divided into: external regulation, cutting off and regulating cut type; According to the flow characteristic can be divided into: linear, such as percentage, parabola, quick opening, the regulating valve is suitable for the air, water, steam, all kinds of corrosive medium, mud, oil medium, such as

Self-reliance type regulator application
Attributable to (1) regulating valve on the dashboard, working temperature should be in 25 ~ 60 c category, air humidity is 95% or less, if be installed in the outdoor or high temperature place, moistureproof, should be adopted for the temperature reduction countermeasures, in the source area of the vibration isolation measures to put an end to the source of vibration or ascension,
Diction regulating valve should be installed vertically, commonly can skew, unique situations such as its weight or large skew Angle adjusting valve is large for valve should enhance the support maintenance,
(3) the installation of electric control valve pipe generally don't have to be away from the road surface or wood floor is too high, the line ratio more than 2 m to set the service platform, as long as possible to facilitate the operator and is helpful to carry out maintenance,
(4) solve the pipeline before the regulating valve is installed in clean, remove waste and weld penetration, after installation, to ensure that the residual in the valve body, avoid the residue of the gate valves should also be again to carry out the clean-up, namely into the material should make all gate valves open, in case of residue jammed after the application handle organization, should be repair to the neutral position of the original,
5] so that self-reliance type valve under the condition of the common faults or maintenance can make the process again, add by-pass pipe regulating valve and also should note that the electric control valve installation position is accordance with the provisions of the processing process,
[6] self-reliance type regulator is part of the electrical equipment installation project construction should be based on the related electrical equipment regulations to carry out, if it is explosion-proof type goods should be according to the "risk of explosion field electrical equipment installation standard" regulations to carry out the installation, such as transmission line on the spot chooses SBH type or other six or eight core, a diameter of 11.3 mm sets rubber cables installed, up and down in the application of maintenance, prohibited to connect power to open the table cover in the inflammable and explosive site maintenance and pried of flame-proof surface, also need not dent or scratch in the disassembly flame-proof, maintenance should be transformed into the original after flame-proof rules,
Once electric actuator reducer after folding solutions should be pay attention to give oil RunHua, generally don't have to remove the oil, low-speed motor assembly line should also check valve position after marking is consistent with valve opening,

Single-seat regulating valve
Leakage is small, easy to implement strict sealing and cutting, for example, can use metal and metal hard seal, or metal with ptfe or other soft seal of composite material, leakage is 0.0 l % C (C) is rated flow coefficient,
Allow the pressure difference is small, for example, DNl00 valve allows only 120 kpa pressure difference,
Small flow capacity, for example, DNl00 pass valve flow capacity is 100,
Due to the fluid media on the valve core thrust is big, the unbalanced force is big, therefore, in high pressure, large diameter of the applications, unfavorable use this kind of control valve,
In recent years, the cage structure because of its direct control valve has simple maintenance, change the valve seat can change the flow characteristic and the advantages of widely used, in order to reduce the valve core is influenced by unbalanced force, can use big thrust actuator, adopting direct two-seater valve structure, also can be used to balance valve spool valve cage structure, the upper valve core and valve cage lubrication graphite sliding between piston ring and cylinder body is used to seal between valve core and valve cage, the cage with the valve cover between also USES the bonnet gaskets, spiral gasket seal, etc. To ensure high pressure fluid would not enter the downstream low pressure chamber, in addition, the fluid through the valve core connecting hole at the top of the balance, and role in the bottom and top of valve core, eliminates most of the static unbalance force, and have a certain amount of damping effect, reduce the vibration of the fluid flow disturbances, such as

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