Blog

20

2017

/

09

Connection mode of valve and corresponding technical requirements

Valve connection is divided into a variety of ways, the entire valve and the pipeline or equipment is how to connect between the valve "run and leak" phenomenon will also occur because of it. 1. flange connection This is one of the most used in the valve connection form. According to the shape of the joint surface can also be divided into the following: 1, smooth type: for the pressure is not high valve, processing is more convenient. 2. Concave-convex type: high working pressure, medium-hard gasket can be used. 3, tongue and groove type: the gasket with large plastic deformation can be used widely in corrosive medium, and the sealing effect is better. 4. Trapezoidal groove type: oval metal ring is used as gasket for working pressure ≥ 64kg/

18

2017

/

09

Common Faults and Preventive Measures of Pressure Reducing Valve

1. automatic valve common faults and preventive measures, the valve is blocked. Especially in the transport of some of the more impurities in the fluid, in most cases the transport of the fluid has a certain amount of impurities, in the transport of these fluids must often be filtered to avoid clogging. Failure analysis: 1. The control channel is small and easy to be blocked by debris; 2. The piston is stuck in the highest position due to rust stains; A filter must be installed before the piston pressure relief valve; For newly installed or long-term deactivated pressure relief valves, they must be disassembled for inspection and cleaning. The valve is straight through and does not have a decompression effect. The piston in the 2. valve will often fail,

13

2017

/

09

The importance of proper installation of traps

Trap installation is appropriate, the normal work of the trap and equipment production efficiency has a direct impact. The installation of the trap must be installed according to the formal requirements, in order to make the trap and equipment to achieve the best working condition. 1. Before installing the trap, be sure to purge the pipeline with pressurized steam to remove the debris in the pipeline. 2. The trap should be installed with a filter to ensure that the trap is not blocked by pipeline debris, and the filter should be cleaned regularly. 3. The valves shall be installed before and after the trap to facilitate the inspection and repair of the trap at any time. 4. Condensate flow direction shall be consistent with the arrow mark of trap installation. 5, the trap should be installed at the lowest point of the equipment outlet, and

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.

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