Blog

19

2018

/

03

Fault performance and maintenance method of one-way valve

The failure of the one-way valve is always on and always off in two forms. Always on will cause refrigeration normal, but the compressor running time is too long. Always cut off will cause the refrigerant not to flow, not cooling. The common faults of the one-way valve mainly include blockage, lax closing, leakage and so on. Check valve maintenance method When the nylon valve body in the valve is dirty and does not move, or the bypass capillary integrated with it is also dirty and blocked, it will cause poor cooling or heating effect, or even no cooling or heating. For this kind of fault, a new one-way valve of the same type is used to replace the fault valve. At the same time, nitrogen must be filled after cleaning the refrigeration system.

18

2018

/

03

Troubleshooting Method of Soft Seal Gate Valve

The soft sealing gate valve uses compressed air as its power, and the club drives the ball to rotate 90 degrees to realize the full opening-full closing action. Its supporting the use of accessories have air filter valve, limit switch, solenoid valve. Among them, the main function of the air filter pressure reducing valve is to stabilize the pressure and filter the impurities and water vapor in the air. The valve is used for a certain period of time the frequent failure is leakage. The following is a brief introduction to the common faults of the valve and the corresponding maintenance methods. For the soft seal gate valve leakage mode, the common are the following: 1, the cylinder on the solenoid valve leakage, may be due to the pressure reducing valve in the pressure is too high. 2. The exhaust hole of the cylinder leaks

13

2018

/

03

How to choose the right electric actuator

1. Determine the electrical parameters according to the selected electric actuator. Due to the differences in the electrical parameters of different electric actuator manufacturers, it is generally necessary to determine the electrical parameters during design and selection, mainly including motor power, rated current, secondary control circuit voltage, etc. As a result, the mismatch between the control system and the electric actuator parameters causes faults such as trip, fuse fusing, thermal overload relay protection jump, etc. 2. Determine the output torque of the electric actuator according to the torque required by the valve. The torque required for the opening and closing of the valve determines the output torque of the electric actuator. Generally, it is determined

08

2018

/

03

Operating mechanism of pneumatic check valve

1. The opening and closing direction of pneumatic valve operation shall be closed clockwise. 2, due to the pneumatic valve in the pipe network, often manual opening and closing, opening and closing the number of revolutions should not be too much, is the large diameter valve should also be within 200-600 turns. 3, in order to facilitate a person's opening and closing operation, under the condition of plumber pressure, a large opening and closing torque should be 240N-m. 4, pneumatic valve opening and closing operation end should be square tenon, and the size of standardization, and facing the ground, so that people can directly operate from the ground. The valve with wheel disc is not suitable for underground pipe network. Pneumatic check valve performance testing 1, the valve a specification of batch manufacturing, should be entrusted to the authority

05

2018

/

03

General requirements for pneumatic check valves

1, the production of pneumatic valve specifications and categories, should meet the requirements of the pipeline design documents. 2. The type of pneumatic valve should indicate the requirements of the national standard number. If it is an enterprise standard, the relevant description of the model should be indicated. 3. The working pressure of the pneumatic valve is required to be ≥ the working pressure of the pipeline. On the premise of not affecting the price, the working pressure that the valve can bear should be greater than the actual working pressure of the pipeline. Any side of the pneumatic valve closed should be able to withstand 1.1 times the valve pressure value without leakage. Under the condition of valve opening, the valve body should be able to withstand twice the valve pressure. 4, pneumatic valve manufacturing standards, should explain the basis of the national standard number or enterprise standards. 5,

29

2018

/

01

How to judge the quality of electric actuators

The standard system of electric actuator is mainly composed of five parts. The system structure is as follows: The first part is the basic standard, which is mainly applicable to the valve electric equipment used in various industrial fields, and is mainly based on the national standard. Including terms, signs, structural length, model preparation and other specifications. The second part is the method specification, including functional experiments, life experiments and flaw detection experiments. The third part is the product specification. Basically according to the valve electric equipment structure classification and concluded that, divided into national norms and professional norms. Including gate valve, globe valve, ball valve, plug valve, butterfly valve, diaphragm valve, trap valve, special valve electric equipment, drive equipment

22

2018

/

01

Characteristics and scope of application of electric two-way valve

Features of electric two-way valve: 1. Automatic magnetic clutch control device, which can produce stable torque under the condition of pause. 2, the use of gear and screw transmission, the center of the gear around the center of the plane rolling bearing support, the valve shaft is the use of the central screw sleeve screw mosquito connection. 3. High-strength ABS flame-retardant engineering plastic shell, waterproof and knock-resistant. 4. Auxiliary manual control lever can be attached to open the valve in case of emergency. 5. With valve position indicator, the valve opening can be clearly observed at the right time. The working principle of the electric two-way valve: the driver is composed

19

2018

/

01

Causes and solutions of internal leakage of pneumatic control valve

Pneumatic control valve has been more and more widely used in various industrial control systems because of its high control accuracy and convenient installation and debugging. However, in the process of use, there are also some problems, that is, the internal leakage of the valve. Common causes and solutions of internal leakage of pneumatic control valves. 1. The zero position setting of the actuator is not accurate and the valve is not fully closed. Adjustment methods: 1) close the valve manually (it must be confirmed that it has been completely closed);2) Close the valve manually with force, subject to a little effort. 3) Screw back (valve opening direction) half a turn; 4) Then adjust the limit. 2, the valve is down

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