Blog

11

2017

/

09

How to Choose Y-type Globe Valve and Its Working Principle

Selection of Y-type globe valve:(1)Y-type globe valve is suitable for small-diameter pipelines to adjust the flow, pressure and accuracy requirements are not high or often closed to cut off the flow of one-way flow of the pipe section. (2) Due to the large resistance of the Y-type stop valve, it is relatively suitable for pipelines with low resistance requirements. (3) It is not suitable for media with high viscosity or containing particles that are easy to precipitate. Y-type globe valve, also known as "DC-type globe valve", Y-type globe valve stem and channel into a certain angle, the valve seat sealing surface and import and export channel also have a certain angle, the valve body can be made into a whole or separate. DC cut-off valve almost does not change the flow direction of the fluid, in

08

2017

/

09

Flow direction of Y-type stop valve

Y-type globe valve is the most common use of a valve, due to the opening and closing process between the cover of the friction is small, more durable, open height is not, easy to manufacture, convenient maintenance, so welcomed by the majority of customers. The closing principle of the Y-type stop valve is to rely on the pressure of the valve bar to make the valve clack sealing surface and the valve seat sealing surface closely fit to prevent the circulation of the medium. Y type stop valve medium for one-way flow, installation with directional. Y type cut-off valve body structure in the form of straight-through, straight-through and right-angle type. The straight-through type is the most common structure, but its fluid resistance is the greatest. Direct flow fluid resistance is small, mostly used for solid particles or sticky.

06

2017

/

09

How to overhaul the pneumatic valve

Step 1: Check whether the solenoid valve is normal, whether the coil is worn out or in poor contact, and whether the spool of the solenoid valve is stuck. Repair method: Replace the coil. Clean up the stuck things on the solenoid valve. Replace the solenoid valve if the above method is useless. Step 2: Check whether the pneumatic actuator works normally, such as cylinder piston blow-by, cylinder body and end cover or shaft leakage, etc. Repair method: Disassemble the actuator and check whether the seal is damaged. Whether the surface of the cylinder inner hole is damaged. Replace the damaged seal ring, replace the piston, or the cylinder. Step three check whether there is something inside the valve core or valve plate stuck. Maintenance method: cleaning miscellaneous

06

2017

/

09

How to overhaul the pneumatic valve

Check whether the solenoid valve is normal, whether the coil is worn out or in poor contact, and whether the spool of the solenoid valve is stuck. Repair method: Replace the coil. Clean up the stuck things on the solenoid valve. Replace the solenoid valve if the above method is useless. Step 2: Check whether the pneumatic actuator works normally, such as cylinder piston blow-by, cylinder body and end cover or shaft leakage, etc. Repair method: Disassemble the actuator and check whether the seal is damaged. Whether the surface of the cylinder inner hole is damaged. Replace the damaged seal ring, replace the piston, or the cylinder. Step three check whether there is something inside the valve core or valve plate stuck. Maintenance method: clean up impurities or

04

2017

/

09

Countermeasures for Control Valve Blockage or Stuck

Due to the principle of medium, the valve will occasionally be blocked or stuck in the process of use, and cannot operate normally. To avoid this problem, Wuhan Xiete Valve Technology Co., Ltd. has taken countermeasures and summarized the following methods for your reference only: rust, welding slag, slag, etc. in the pipeline of 1. cleaning method will cause blockage or jam in the hole of each part of the valve, cause the valve core, guide surface, sealing surface to produce indentation, deformation, etc., which is the most common fault. When this happens, the device should be removed in time for cleaning, and the dirt should be cleaned; if the sealing surface is damaged, it should be ground; at the same time, the bottom plug should be removed.

01

2017

/

09

The principle of valve sealing

The valve sealing function requirements, to prevent leakage angle. According to the different parts and degree of the leakage, the leakage of the valve is different, so it is necessary to put forward different methods. There are two reasons for leakage, one is the most important factor affecting the sealing performance, that is, there is a gap between the sealing pair, and the other is the pressure difference between the two sides of the sealing pair. The principle of valve sealing is also analyzed from four aspects: liquid sealing, gas sealing, leakage channel sealing principle and valve sealing vice. 1. The tightness of the liquid The tightness of the liquid is through the viscosity and surface tension of the liquid

30

2017

/

08

Discussion on how to maintain the pneumatic valve

Pneumatic valve is a kind of valve driven by compressed air. When selling pneumatic valves, only clear specifications, categories and working pressure can generally meet the purchasing needs of customers. Start valve can generally be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. Pneumatic valve is a kind of high-quality valve with convenient operation and low failure rate. In daily use, we need to develop a good habit of valve inspection and maintenance. Regular inspection and maintenance, the equipment runs more smoothly. So in the daily inspection of pneumatic valves, how should the specific work be carried out

30

2017

/

08

Discussion on how to maintain the pneumatic valve

Pneumatic valve is a kind of valve driven by compressed air. When selling pneumatic valves, only clear specifications, categories and working pressure can generally meet the purchasing needs of customers. Start valve can generally be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. Pneumatic valve is a kind of high-quality valve with convenient operation and low failure rate. In daily use, we need to develop a good habit of valve inspection and maintenance. Regular inspection and maintenance, the equipment runs more smoothly. So in the daily inspection of pneumatic valves, how should the specific work be carried out

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