Blog

09

2017

/

08

The difference between relief valve and relief valve

Pressure reducing valve is to ensure that the system is not overloaded under the premise of reducing system pressure, pressure reducing valve is generally set in the outlet pressure; relief valve is to prevent system overload, to ensure safety, relief valve is generally only used as low pressure and safety valve. The difference between pressure reducing valve and overflow valve (I) that the pressure reducing valve works actively, while the overflow valve works passively: 1. The pressure reducing valve keeps the pressure at the outlet unchanged, while the overflow valve keeps the pressure at the inlet unchanged; 2. When not working, the inlet and outlet of the pressure reducing valve communicate with each other, while the inlet and outlet of the overflow valve are blocked. 3. When not working, the valve port of the pressure reducing valve is open, while the overflow valve is normally closed, mainly to control the system pressure, can also play the role of unloading. (II) pressure reducing valve is a valve outlet pressure is lower than the inlet pressure of the pressure regulating valve: 1, the pressure reducing valve is mainly used to reduce the pressure of a branch of the hydraulic system, the branch pressure is lower than the main oil pressure and stable, in the set pressure range, the pressure reducing valve is also like the relief valve is closed. However, as the system pressure rises, when the pressure set by the pressure reducing valve is reached, the pressure reducing valve opens and some oil will return to the oil tank through it. The oil pressure of this branch will not rise. It plays the role of decompression and stabilization of this branch! Relief valve is different, it is installed at the outlet of the pump will ensure that the overall pressure of the system is stable and not overpressure. So he has safety, voltage regulation, voltage stabilization and other functions! 2. The pressure reducing valve is generally connected in series on a certain road to reduce pressure and maintain the function of this branch. The overflow valve is generally connected in parallel in the branch of the system to adjust pressure, stabilize pressure and reduce pressure. (III) pressure reducing valve is normally open, through the narrow channel decompression; relief valve is normally closed, only when the system overpressure action. The pressure reducing valve is to reduce the pressure, and the pressure of a certain part of the hydraulic system is reduced. The function of the relief valve is to stabilize the pressure, overflow and overload protection. Use is not the same. So it cannot be replaced. (IV) pressure reducing valve control outlet pressure, relief valve control inlet pressure.

07

2017

/

08

Pneumatic Reversing Valve Fault Explanation and Solutions

1. reversing insensitive fault 1. Eccentricity in assembly is due to errors in the flatness of the joint surface of the pneumatic reversing valve, which causes the assembly personnel to exert too much force when installing the fastening screws, resulting in deformation of the valve body, thus causing eccentricity of the valve core; 2. Insufficient machining accuracy. The manufacturing accuracy of the valve core and valve hole of the pneumatic reversing valve is relatively high. If the machining accuracy is not enough, the friction will increase, the valve core will make the valve core move unagile and even the valve core stuck; 3, pollutants wedged or bonded in the gap between the valve core and the valve hole, the main pollutants are solid particles, colloidal sludge, rust, etc., these pollutants increased between the valve core and the valve hole

04

2017

/

08

Failure Analysis and Elimination of Flow Control Valve

1. adjust the throttle valve handle without flow change 1. The pressure compensation valve does not operate. The pressure compensation valve core is stuck in the closed position, the geometric accuracy of the valve core and the valve sleeve is poor, the gap is too small, the spring is bent and deformed laterally, and the valve core is stuck, and the spring is too weak. Elimination method: check the accuracy, repair the gap to meet the requirements, move flexible, replace the spring. 2. Throttle valve failure The oil is too dirty to block the throttle port, the assembly position of the handle and the throttle valve core is inappropriate, the connection on the throttle valve core is lost or the key is not installed, the throttle valve core is stuck due to too small matching clearance or deformation, and the thread of the adjusting rod is blocked by dirt, causing poor adjustment. Elimination method: check the oil quality

02

2017

/

08

Pressure Test Methods and Pressure Test Management Regulations for Three Types of Valves

Pressure test method of 1. pressure reducing valve ① The strength test of pressure reducing valve can usually be assembled after single piece test or after assembly test. After the bellows is welded with the component, the maximum pressure after the application of the pressure reducing valve is 1.5 times, and the strength test is carried out with air. The sealing test should be carried out according to the actual medium. When testing with air or water, the test shall be carried out at 1.1 times of the nominal pressure; when testing with steam, the maximum working pressure allowed at the working temperature shall be carried out. The difference between inlet pressure and outlet pressure shall not be less than 0.2MPa. The test method is as follows: after the inlet pressure is set, gradually adjust the adjusting screw of the valve in turn to make the outlet pressure

31

2017

/

07

Material, Inspection and Transmission Device of High Pressure Casting Globe Valve

1. high pressure casting cut-off valve material body and valve cover material is divided into several kinds. Valve materials in strict accordance with the requirements of steel valves and the requirements of the relevant valve material standards for material selection, and to ensure the service life of the valve. The valve materials produced by Wuhan Xiete Valve Technology Co., Ltd. are manufactured in accordance with the specified standards. The steel castings shall be heat treated according to the standard requirements. Non-destructive testing of pressure-bearing steel castings. All pressure forgings meet the specified requirements. The report and inspection documents shall be filed to facilitate the inspection and acceptance by the buyer during the valve production process. Stem material is divided into 13Cr, 304 or 316. Stem material according

28

2017

/

07

Heat treated carbon steel gate valve sealing surface

The so-called heat treatment of carbon steel gate valve sealing surface refers to the heat treatment process of carbon steel valve body and gate surfacing cobalt chromium tungsten carbide sealing surface. Carbon steel valve surfacing cobalt chromium tungsten carbide sealing surface, to stress annealing, the main purpose is to remove the residual stress generated by the welding, improve the mechanical processing performance. For the gate valve with carbon steel matrix, CoCrW hard alloy, SF-4(137) alloy and WF330 or Fe30 parts are welded by spray welding, the heating temperature of stress relief annealing is selected according to the carbon steel matrix material, generally 600~650 ℃. The holding time depends on the effective thickness of the part, generally

26

2017

/

07

Five tips to quickly solve the valve sealing performance is poor

Many valves generally have poor sealing performance, and many users do not know how to solve them. Wuhan Xiete Valve Technology Co., Ltd. organized senior technicians to study carefully and quickly find out five effective ways to solve the poor sealing performance of the valve. Five effective ways to solve the poor sealing performance of the valve: 1. grinding method after grinding, eliminate traces, reduce or eliminate the sealing gap, improve the smoothness of the sealing surface, in order to improve the high sealing performance of the valve. 2. improve the sealing force of the actuator to improve the sealing force of the actuator to the valve core, it is also a common method to ensure that the valve is closed, increase the sealing ratio and improve the sealing performance. Commonly used

24

2017

/

07

Necessary protective measures shall be taken for valve installation

When installing the valve, the operator must understand its installation method, because the valve in the installation of protective measures is very important. If you do not pay attention to the installation is very easy to cause damage or leakage of the valve, it will cause a lot of trouble. So, what protective measures do we need to take when installing the valve? By Wuhan Xiete Valve Technology Co., Ltd. describes in detail the protective measures for the installation of the valve. Check valve protective measures in order to prevent leakage or failure of the check valve after the media backflow, resulting in product quality decline or cause accidents and other adverse consequences, the check valve will be set before and after one or two

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