Blog

18

2020

/

07

Selection of Balanced Pneumatic Globe Valve

Selection of balanced pneumatic stop valve. 1, the reliability of balanced pneumatic globe valve, the required valve should have high reliability and large safety factor, valve failure will not cause major production safety and casualties; in order to meet the requirements of long-term operation of the factory, long-term continuous production is the benefit.

16

2020

/

07

The working principle and structural characteristics of the balanced pneumatic stop valve

Balanced pneumatic globe valve the introduction of advanced technology, advanced structure, built-in balance system, through the solenoid valve to achieve remote control, into the programmable controller, by the gas source, drive, open and close balance, flexible action, accurate and reliable, long service life. Balanced pneumatic globe valve is used for 120 working temperature, working pressure 2.5 MPa, applicable medium is water, steam, oil and other media. Used for process control in petroleum, chemical, metallurgy, power plant and other industries. It can act accurately according to the control instructions to realize remote control, centralized control and automatic control.

16

2020

/

07

The role of the orifice plate

When the pressure difference between the front and back of the pipeline is large, the method of increasing the orifice plate is usually used. The principle is that when the fluid flows in the pipeline, due to the local resistance of the orifice plate, the pressure of the fluid decreases and the energy is lost. This phenomenon is thermodynamically called throttling. This method is simpler than using a regulating valve, but a suitable method must be selected, otherwise the liquid is prone to cavitation and affects the safe operation of the pipeline.

13

2020

/

07

Common Failure Analysis of Filling Valve

Wuhan Xiete Valve is a professional manufacturer of hydraulic press series forging machine tools. It mainly produces: liquid charging valve, scraper conveyor, balanced pneumatic stop valve, minimum liquid level valve, minimum flow valve, check valve, proportional pressure reducing valve, sintered roller distributor, coking screw feeder, electric tracing anti-leakage gas drain, throttle orifice plate, descaling injection valve, high pressure pneumatic gate valve, high pressure filter, high pressure valve maintenance, etc. Customers are welcome to order and consult products.

10

2020

/

07

Filling valve principle and matters needing attention

Filling valve principle: under high pressure and large flow, it can play the role of unloading and avoid unloading impact. The charging valve is generally used as a suction and drain valve between the straight hydraulic and the oil tank. When the large press moves quickly, the oil cylinder should be supplemented with a large amount of oil and automatically suck the oil into the oil tank; when moving forward and pressurizing slowly, prevent the oil from overflowing from the oil cylinder to the oil tank. When reversing, the oil can be drained from the cylinder to the oil tank.

05

2020

/

07

The structural characteristics of the descaling injection valve make it have a long service life

The descaling injection valve is mainly composed of the main valve, the driving part and the control part. As shown in Figure 1, the main valve is a balanced spool valve structure, including a valve body, a plunger spool, a bushing and a seal. The driving part is a double-acting cylinder, which is composed of a cylinder barrel, a piston, an upper cylinder head, a lower cylinder head and an indicator sensor. The control part adopts pneumatic control, which is composed of pneumatic trio, one-way throttle valve, two-position five-way solenoid valve and other components. All control components are installed in the control box.

03

2020

/

07

Principle and characteristics of descaling injection valve

The descaling jet valve is mainly used in the hot-rolled descaling system of the metallurgical industry. It is installed on the pipeline with water as the medium to remove the scale on the surface of the steel plate or billet.

02

2020

/

07

What are the main factors affecting the valve seal?

Valve leakage is very common in industrial production, and the impact is very large. A valve that relies on external force to rotate and drive to open and close is designed with a sealing device, which is used to install a certain number of packing seals in the packing culvert to achieve the sealing effect. The leakage of the valve packing is one of the most prone parts of the valve to leak. The reasons are as follows: 1. The structure of the sealing pair changes when the temperature or sealing force changes. And this change will affect and change the sealing force between each other, so that the valve sealing performance is reduced. Therefore, when selecting a seal, a seal with elastic deformation must be selected. At the same time, also pay attention to the width of the sealing surface. The reason is that the contact surface of the sealing pair can not be completely consistent, when the sealing surface width increases, it is necessary to increase the sealing force required. 2. The specific pressure of the sealing surface affects the sealing performance of the valve and the service life of the valve. Therefore, the sealing surface pressure is also a very important factor. Under the same conditions, the pressure is too large to cause damage to the valve, but the pressure is too small to cause valve leakage. Therefore, we need to fully consider the suitability of the specific pressure in the design. The physical properties of the medium also affect the sealing performance of the valve. These physical properties include temperature, viscosity, and hydrophilicity of the surface. Temperature changes not only affect the relaxation of the sealing pair and the change of the size of the parts, but also have a close relationship with the viscosity of the gas. The gas viscosity increases or decreases as the temperature increases or decreases. Therefore, in order to reduce the degree of influence of temperature on the sealing performance of the valve, we should design the valve with thermal compensation, such as elastic valve seat. Viscosity is related to the ability of the fluid to penetrate. When under the same conditions, the greater the viscosity, the smaller the permeability of the fluid. Surface hydrophilicity means that when there is a film on the metal surface, the film should be removed. Because this layer is very thin oil film, will destroy the surface of the hydrophilic, resulting in blockage of the fluid channel. 4. The quality of the sealing pair The quality of the sealing pair mainly means that we have to check the selection, matching and manufacturing accuracy of materials. For example, the valve and valve seat sealing surface is consistent, can improve sealing.

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