Blog

16

2019

/

07

Service life of valve packing

In the valve design or use experience, lift valve packing for asbestos packing, graphite packing, polytetrafluoroethylene packing, but these kinds of packing are limited by the number of valve opening and closing, that is, with the increase of the number of valve opening and closing, the packing will wear, the gap gradually increases, to a certain number of valves will leak from the packing. After leakage, the packing gland needs to be repressed. This scheme is suitable for the number of valve opening and closing occasions. If the valve is opened and closed frequently, this will undoubtedly increase the use and maintenance costs of the valve. When the valve is opened and closed many times, it can still be sealed: 1. add a gasket under the packing, under the gasket

08

2019

/

07

Leakage of valve packing and its solution

Reasons for leakage of valve packing: 1. The packing is not selected correctly, is not resistant to corrosion of medium, and is not resistant to high pressure or vacuum, high temperature or low temperature of the valve; 2. The packing is not installed correctly, and there are defects such as poor spiral winding joint, tightening and loosening, replacing large with small. 3. The packing has aged and lost its elasticity after exceeding its service life. 4. The precision of the valve stem is not high, there are defects such as bending, corrosion, wear, etc.; 5. The number of packing circles is insufficient, and the gland is not compressed; 6. The gland, bolts, and other parts are damaged, so that the gland cannot be compressed; 7. Improper operation, excessive force, etc.; 8. The gland is skewed, and the gap between the gland and the valve stem is too small or too large, causing the valve stem to wear

01

2019

/

07

Selection of electric stop valve

When the electric cut-off valve is in the open state, there is no contact between its valve seat and valve sealing surface, so its sealing surface mechanical wear is small. In the process of opening and closing, the friction between the valve flap and the sealing surface of the valve body is smaller than that of the gate valve, so it is wear-resistant. Open height is generally only 1/4 of the diameter of the seat channel, so much smaller than the gate valve. Usually there is only one sealing surface on the valve body and the valve clack, so the manufacturing process is better and easy to repair. The flow direction of the medium through such valves has changed, so the flow resistance of the electric stop valve is higher than other valves. Electric cut-off valve selection: electric cut-off valve often

13

2019

/

06

Flame spraying process flow of valve seat sealing surface

The preparation work before the valve spray welding, surface pretreatment, valve spray welding, valve spray welding after treatment. Preparation before spray welding of 1. valves: determination of spray welding materials, spray welding tools, spraying equipment and processes. 1. Determine the thickness of the coating. Generally speaking, the valve must be machined after spray welding, so the coating thickness should be reserved for machining allowance, and the thermal expansion and contraction of the valve during spray welding should also be taken into account. 2. Determination of coating material. The selection basis is that the coating material should meet the material, technical requirements and working conditions of the valve spray welding workpiece, and the material of the bonding layer and the working layer should be selected respectively. 3. Determine parameters: pressure, powder particle size

30

2019

/

05

Flange valve installation

Flange valve is connected to the flange of the valve, the valve body with flange, and pipe flange connection, common flange gate valve, flange globe valve and so on, most of the valves can be used flange connection. Flange valve installation instructions: 1. The verticality between the flange surface on the pipe and the center line of the pipe and the error of the flange bolt hole should be within the allowable range. The valve and the center line of the pipe should be consistent before installation. 2. Flange faces of valves and piping shall be free of damage, scratches, dirt, etc. Especially when the metal gasket is used, the groove of the flange should be consistent with the gasket to ensure that it is in good sealing condition. 3. Tightness of flange

27

2019

/

05

Examples of repairs to high-pressure gate valves, check valves, etc.

Wuhan Xiete Valve Technology Co., Ltd. has a high-pressure test station and corresponding testing equipment with mature repair experience. Professional technical teams make professional repair solutions for different valves and different caliber sizes. We will continue to provide customers with more thoughtful, more detailed and higher-level valve repair services.

21

2019

/

05

The difference between internal thread valve and external thread valve

Threaded valve (also called thread valve, threaded valve or internal valve) generally refers to the valve body with internal thread or external thread of the valve, mainly divided into internal thread valve and external thread valve, the use of threaded connection and pipe corresponding. Generally, threaded valves can only be made with small diameters and are used for normal pressure or low pressure projects. If they are not available for high pressure work, they need to be used by welding link valves or flange connection valves. Common threaded valves are: threaded gate valve, threaded ball valve, threaded globe valve, threaded check valve. The difference between internal thread valve and external thread valve: from the use: due to the price, work flow needs, most of the market

05

2019

/

05

Different types of gate valves

Gate valve is also called gate valve, mainly by the body, bonnet, gate, stem, seat and seal packing and other parts, is one of the most common types of valves. The main purpose of the gate valve is to cut off the fluid, and it is for this reason that it is often called a "cut-off" valve or a "block" valve. Gate valves have many different structural forms, and the types of sealing elements used are different. According to the structure of the sealing element, it can be divided into several different types. According to the classification of stem: according to the type of stem can be divided into open stem gate valve and dark stem gate valve. The valve stem is the operating part of the gate valve, and its function is to transmit the opening and closing force to the opening and closing parts. 1. Ripper gate valve and its valve

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