Blog

25

2018

/

04

How to select the actuator and valve drive device

The actuator and the valve body shall be assembled and debugged to form the control valve assembly. It is used to drive the valve to act, and at the same time, the mechanical position of the valve and the opening information are fed back to the automation system. form an automated control unit. Actuators in accordance with the access to energy to distinguish, there are three main categories: 1. electric actuator 2. pneumatic actuator 3. electro-hydraulic actuator (access to the hydraulic device to drive a larger torque valve, usually used for large valves) according to different valve structure and process conditions, need to choose a different actuator to meet the control needs. usually in

23

2018

/

04

Transformation of electric actuators

Electric actuator is a very important executive unit in the combination surface of electric unit in industrial control system. Electric actuators can supply linear or rotary motion of the drive device, it uses some kind of driving power and under the action of some kind of control signal. Electric actuators use liquid, gas, electricity or other power and convert it into driving action through motors, cylinders or other devices. The electric actuator is generally composed of two completely independent parts on the circuit, the control circuit and the executive organization. It can receive the electronic control signal from the scheduler and convert it linearly into a mechanical angle or linear displacement to operate the damper and baffle., Valve and other adjustments

18

2018

/

04

Eight Ways to Improve the Life of Regulating Valve

11

2018

/

04

Causes and solutions of electric actuator vibration

09

2018

/

04

Forged steel globe valve three kinds of body cover connection design form

Forged steel cut-off valve has three kinds of body cover connection design: the first is the body cover bolt connection forged steel cut-off valve, according to this connection form of the design of the valve, the valve body and the valve cover with bolts, winding gasket seal, the advantage is easy to repair. The second kind of body cover welding connection forged steel globe valve, according to this connection form design of the valve, the valve body and the valve cover full welding seal, the advantage is no external leakage. The third is the pressure self-tightening valve cover forged steel globe valve, according to this connection form design of the valve, the valve body and the valve cover with screw mosquito connection, internal pressure from the sealing ring seal, the advantage is that the greater the internal pressure, the better the sealing performance. You can according to the actual

29

2018

/

03

Cleaning steps and assembly requirements for degreasing valves

1. Cleaning steps for valve degreasing: valve degreasing parts must go through the following processes before assembly: 1) according to processing requirements, some valve parts need to be polished, and the surface should not have processing burrs, etc.; 2) Degreasing treatment for all valve parts; 3) Pickling passivation after degreasing (the cleaning agent does not contain phosphorus);4) Rinse with purified water after pickling passivation, there should be no drug residue (this step is omitted for carbon steel parts);5) each valve parts should be dried with non-woven fabric, and the surface of the retained parts such as wire wool should not be dried, or blow-dried with clean nitrogen; 6) Use non-woven fabric or precision filter paper

26

2018

/

03

Several major technical characteristics of fully welded ball valve

1. The valve body structure is integrally welded, and there will be no external leakage. 2. The valve seat is composed of PTFE sealing ring and spring, which has strong adaptability to changes in pressure and temperature, and will not produce any leakage within the scope of use. 3. The anti-leakage structure of the valve stem has a PTFE self-sealing gasket and an O-ring at the bottom of the valve stem. There are two O-rings and two PTFE gaskets on the valve stem to ensure no leakage. 4. The valve body material is the same as the pipe material, and there will be no uneven stress, nor will it be squeezed and deformed due to earthquakes and vehicles passing through the ground. 5. The valve body is light and easy to keep warm. 6, directly buried ball valve can be directly

23

2018

/

03

Valve electric device is an indispensable equipment

Valve electric device is to achieve the valve is now controlled, automatic control and remote control indispensable equipment, the movement process can be controlled by the size of the stroke, torque or axial thrust. Since the working characteristics and utilization of the valve electric device depends on the type of valve, the device work specification and the position of the valve in the pipeline or equipment, the correct selection of the valve electric device is essential to prevent overload phenomenon (working torque is higher than the control torque). Valve electric device of its special requirements, that must be able to limit the torque or axial force. Usually the valve electric device uses a torque-limiting coupling. When the specification of the electric device is determined, its control torque

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