Blog

20

2017

/

12

How to operate a manual valve

Manual valve, is through the handle, hand wheel operation of the valve, is the equipment pipeline on the use of a common valve. Its handle and handwheel rotate clockwise to close and counterclockwise to open. However, there are also individual valves that open the opposite of the above. Therefore, before the operation should pay attention to check the opening and closing signs before operation. The handwheel and handle on the valve are designed according to normal manpower. Therefore, it is stipulated that the operator is not allowed to open or close the valve with the help of levers and long wrenches. If the diameter (length) of the handwheel and handle is less than 320mm, only individual operation is allowed. If the diameter of the handwheel is more than 320mm, two persons are allowed to operate together, or

13

2017

/

12

Pressure Test Method of Check Valve

Check valve is to rely on the flow of the medium itself and automatically open and close the valve flap, used to prevent the medium back flow of the valve, also known as check valve, one-way valve, reverse flow valve, and back pressure valve. Check valve is a kind of automatic valve, its main function is to prevent the medium back, to prevent the pump and drive motor reverse, and the discharge of the container medium. Check valve pressure test method: check valve test status: lift check valve disc axis in a position perpendicular to the horizontal; swing check valve channel axis and disc axis in a position approximately parallel to the horizontal line. During the strength test, the test medium is introduced from the inlet end to the specified value, and the other end is closed,

11

2017

/

12

Introduction to the principle and structure of gas pressure reducing valve

1. The medium pressure at the front of the valve enters the body cavity from the opening gap between the valve disc and the sealing ring of the valve body so that the medium pressure flows into the combination box of the bellows. The bellows and the spring are compressed by the medium pressure. The valve disc moves with the valve stem, and the valve disc closes the sealing ring of the valve body, cutting off the medium before the valve without supplementing the medium pressure after the valve. When the pressure of the medium after the valve is reduced, the bellows is deformed by the radial force of the adjusting spring, and the valve stem opens the disc. Make the medium through the valve body seal ring to supplement the valve after the pressure drop. 2. The gas pressure reducing valve is composed of valve body, valve cover, valve clack, valve body sealing ring, valve stem, bellows,

08

2017

/

12

How to deal with control valve packing always leak

Control valve is one of the automatic control system of the terminal control components, due to the chemical plant, there are many high temperature, high pressure conditions, some media have strong corrosive and toxic, and flammable and explosive, when the valve packing leakage, not only cause waste of raw materials, but also cause serious pollution to the environment, and even cause fire, explosion, poisoning and other life-threatening safety accidents. Therefore, the control valve packing leakage problem should be paid enough attention to, in the design selection of a reasonable choice of sealing packing is very important. For the control valve packing seal, combined with years of work experience and related information, through the control valve stuffing box structure

04

2017

/

12

Materials of cast and forged valves

Casting valve is cast into the valve, the general casting valve pressure rating is relatively low. Forged valves are forged and are generally used in high-grade pipelines. 1. casting 1. Casting: It is the process of smelting metal into liquid that meets certain requirements and pouring it into the casting mold. After cooling, solidification and cleaning, the process of obtaining castings (parts or blanks) with predetermined shape, size and performance is obtained. The basic process of modern machinery manufacturing industry. 2. The cost of the blank produced by casting is low, and it can show its economy for parts with complex shapes, especially with complex cavities; at the same time, it is suitable

29

2017

/

11

Difference between different control valves

In practice, the control valve plays a very important role, and the production of many factories depends on the correct distribution and control of the flowing medium. These controls, whether energy exchange, pressure reduction or simple container charging, require some final control element regulating valve to complete. Regulating valve is generally composed of two parts: actuator and valve assembly. In some cases with valve positioner, hand wheel mechanism and other accessories. The flow characteristic of the regulating valve is the relationship between the relative flow rate of the medium flowing through the regulating valve and its opening degree under the condition that the pressure difference between the two ends of the valve remains constant. The flow characteristics of the regulating valve have linear characteristics, such as percentage

27

2017

/

11

Valve maintenance skills

The valves used in various fields are of various types and different structures. The maintenance of each valve should be carried out according to the specific structure. 1. the maintenance of the valve body and bonnet The valve body and bonnet are the most external closed shells of the valve, which are used to withstand the pressure of the medium, the additional force during operation, the weight of other parts of the valve, and the tightening force of the flange or thread at the connection. Valve body and bonnet requirements have a certain strength and stiffness, their damage is mainly medium corrosion, erosion and mechanical damage caused by local defects, when due to corrosion or erosion caused by wall thinning, and affect their strength and stiffness, it can not be repaired, should be replaced. During maintenance, the valve

23

2017

/

11

Installation and Use of Self-operated Temperature Regulating Valve

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