Blog

30

2018

/

08

How to select and test high quality valve blank

Machining commonly used blanks are castings, forgings, profiles and weldments. Different types of blanks and the accuracy, roughness and hardness of the blank have a direct impact on the machining process. The following factors should be considered when selecting the valve blank:(1) the material of the parts and the organization and performance requirements of the material. The part material specified on the design drawing generally determines the type of blank. For example, if the part material is cast iron, the blank must be made by casting. For steel parts, the mechanical properties of the material should be considered when selecting the blank. For example, parts for the manufacture of high-pressure valves should generally be forged or welded

27

2018

/

08

Overload of electric valve

When using electric valves, we will generally take into account the relevant operational specifications, otherwise it will directly affect the role of electric valves. Therefore, it is necessary to pay close attention to these situations that may cause the electric valve to work overload: First, the work overload caused by the problem of the working power supply of the electric valve. Each type of electrical equipment has a specific working environment when working, such as power supply environment. If we do not configure the power supply for these devices in accordance with the prescribed working environment, it will definitely affect the normal operation of the equipment. So for the operation of the electric valve, the power supply

16

2018

/

08

Advantages and disadvantages of gate valve

Gate valve advantages: 1, the fluid resistance is small, the sealing surface by the medium erosion and erosion of small. 2, open and close more labor-saving. 3. The flow direction of the medium is not restricted, does not disturb the flow, does not reduce the pressure. 4. Simple shape, short structure length, good manufacturing process and wide application range. The disadvantages of the gate valve are as follows: 1, between the sealing surface is easy to cause erosion and abrasion, maintenance is difficult. 2. The external dimensions are large, opening requires a certain space, and the opening and closing time is long. 3, the structure is more complex. The type of gate valve, according to the sealing surface configuration can be divided into wedge gate valve and parallel gate valve, wedge gate valve can be divided into: single gate pole type, double gate plate type and

14

2018

/

08

Maintenance method of regulating valve

1. Maintenance methods and standard maintenance methods:(1) According to the operating procedures, the replacement is required to be qualified. The maintenance worker shall carry the canister, vinyl chloride olfactory sensor and the gas prevention station staff before dismantling and inspecting the valve. (2) Turn off the gas source, remove the positioner and the gas source pipe, and disassemble the valve. (3) For the connection of the valve stem of the valve core, check the connection condition of the valve stem of the valve core, and check whether the connecting pin can be removed. If not, use special tools to remove it, or change the hole. 2. Assembly of the valve after overhaul (1) All components of the valve shall be cleaned and inspected before assembly. The assembly sequence shall be from bottom to top. The added gasket shall be coated with grease and added

10

2018

/

08

Preventive Measures for Leakage Steam of Valve

As a control component in the fluid delivery system, the valve has the functions of cut-off, regulation, diversion, prevention of countercurrent, pressure stabilization, diversion or overflow pressure relief. It is an indispensable control component in many industries. Once the valve fails, especially The leakage event will not only affect the stable operation of the equipment, but may even harm the environment and cause incalculable economic and social losses to the society. Therefore, we should learn to identify and prevent common leakage faults of valves. Generally speaking, common leakage faults of valves include two kinds, namely stuffing box leakage and closing parts leakage. The leakage of stuffing box is the main aspect of running, running, dripping and leaking. This is

07

2018

/

08

Soft seal gate valve fault elimination method

1, soft seal gate valve packing leakage (1) packing gland is too loose, can be evenly pressed packing gland with nut tightening. (2) The number of packing rings is not enough, and the packing should be increased. (3) packing due to the use of too long or improper preservation of failure, should be replaced with new packing, replacement must pay attention to the joints between the rings should be cross staggered 1200. 2, soft seal gate valve gate and valve seat sealing surface (1) between the sealing surface of dirt, can be washed to eliminate. (2) If the sealing surface is damaged, it should be re-ground, and if necessary, it can be re-surfacing and processed. The ground sealing surface must be smooth and its roughness must not be less than 0.4. 3. Soft seal gate valve body

02

2018

/

08

Problems and solutions of valve maintenance before operation

1. Check that the valve is in the fully open position. After the grease injection operation is completed, first check whether the valve diameter is flush with the inner cavity plane of the valve seat. If there is any difference, adjust the opening limit bolt on the actuator to ensure that the valve is fully open. Otherwise, once the valve is installed, it is impossible to judge whether the valve is in the fully open position. 2. The valve cannot inject grease (1) When the valve shaft performs grease injection operation, the sealing pressure in the valve shaft shall not exceed a specific pressure. Once it exceeds, check whether the grease injection gun is faulty and whether the outlet valve at the grease outlet of the grease injection gun is open. (2) If there is no fault in the valve grease injection gun, check whether the grease injection nozzle is blocked, that is, slowly twist the grease injection nozzle and install it at the grease outlet hole of the grease injection gun. By injecting grease into the grease injection nozzle, observe whether the grease injection nozzle can produce grease. If there is no grease, it indicates that the one-way valve in the grease injection nozzle is faulty, and the grease injection nozzle should be replaced. If the grease injection nozzle can produce grease, check the check valve located in the grease injection hole downstream of the grease injection nozzle, and use special tools to screw it out for inspection. If there is any blockage such as raw material tape, it should be removed. If it is a serious fault, it should be replaced. 3. The valve seat seal grease injection pipeline may be blocked after the grease injection of the valve, resulting in uneven or no grease in the grease injection hole of the valve seat. At this time, the valve can be closed from the fully open state for 15 ° ~ 25 ° to observe the grease outlet hole of the valve seat, and gently dredge it with a soft tool, and then observe the grease injection.

30

2018

/

07

The purchase method and type of shut-off valve

The choice of 1. structure type double sealing valve is one of the main disadvantages of large leakage. Single seal type control valve shall be selected. Sealing issues, reliability issues, maintenance and spare parts issues were all resolved. Now people began to look for a simpler structure, more reliable seal cut-off valve. At this time, it was found that the angle stroke valve is more superior than the straight stroke valve, so three eccentric cut-off butterfly valve, full-function cut-off valve and so on were produced. 2. sealing surface selection (1) face-to-face seal: common plunger valve core, its sealing surface is a small cone surface of 60 ℃, valve

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