Blog

12

2019

/

03

How to judge whether the valve is internal leakage or external leakage

In the process of using the valve, there will be some failures. The leakage of the valve is the most common one among the many failures, and the leakage of the valve is generally in two cases: internal leakage and external leakage! The internal leakage of the valve, generally refers to when the valve is completely closed, there is still a medium from the valve flow path outlet outflow, leakage or dripping, etc., popular point of view, is not tight, the seal is not good! The cause of the failure, usually due to the erosion of the medium, or contain impurities and other reasons. Even if the valve screw (valve stem) is tightened in place, there is still a gap between the valve core and the valve body,

04

2019

/

03

The structural characteristics of forged steel gate valve

With the development of economy, forged steel gate valve and other valve industry as an important part of machinery and equipment manufacturing industry, has a very important role. Forged steel gate valve is not only widely used in the industrial field, its influence in the civil field is gradually expanding. After the emergence of forged steel gate valves, a large number of general-purpose cut-off valves and regulating valves have been replaced. Forged steel gate valve can complete the action control and signal output of the open and close positions through the electromagnetic valve proximity switch and other accessories, and can also complete the automatic control of continuous action. Forged steel gate valve is widely used in chemical industry, coal, sewage and other fields, is an ideal sealing valve. Forged steel gate valve is mainly composed of left,

21

2019

/

02

Structure form of stop valve

Valve is mainly used to connect or cut off the medium in the pipeline, generally not used to adjust the flow. Valve applicable pressure, temperature range is very large, but generally used for medium and small diameter pipe. Cut-off valve structure principle: 1, the center of the inlet and outlet of the cut-off valve is located in the same straight line, and the fluid flows like an S-shaped sphere, so it is also called a spherical cut-off valve. 2. When the valve seat of the valve stem is lowered toward the bottom sealing surface, the medium stops flowing; when the valve stem rises, the medium passes through the flow channel from below to above. When the stop valve is installed, there is generally a direction requirement. The flow direction of the medium in the pipeline generally flows through the valve seat from bottom to top, which is our

14

2019

/

02

Vacuum valve internal leakage has "know-how"

The first step: internal leakage of gate valve. According to the calculation of energy consumption of the unit, compared with yesterday, the raw materials are the same today. If the yield decreases, besides excluding the causes of process and instrument, it is preliminarily judged that there may be internal leakage of gate valve, resulting in increased energy consumption. The second step: thermometer detection "no less". If the gate valve leaks, the temperature of adjacent subsequent pipelines will increase or decrease significantly through the thermometer. The third step: we through the first step, the second step method to check the gate valve leakage, but can not be fully confirmed, then "stethoscope" detection is very important. You can choose a screwdriver as a "stethoscope". One end of the screwdriver head is perpendicular to the pipeline, and the other end is close to your ear,

14

2019

/

01

Cleaning of hydraulic valve parts

The cleaning of hydraulic valve parts is a key auxiliary process in the production of hydraulic parts, and its quality restricts the reliability and stability of hydraulic valves. The cleaning method has a great relationship. The cleaning of the 1. valve body The cleaning of the valve body can be divided into four levels, namely rough washing, ultrasonic cleaning, rinsing, medium pressure and large flow flushing. Rough washing and rinsing should be divided into grooves for cleaning. Both methods can be washed with water under certain pressure. Grinding valve bodies should be pretreated with burr scraping, demagnetization and polishing. The formula of the rough washing and rinsing cleaning solution is the same, and the rinsing is carried out with a large flow of diesel oil or an aqueous solution with antirust agent. The ultrasonic cleaning fluid shall be circulated and replenished in the circulation.

02

2019

/

01

Connection mode of valve and pipeline

The choice of the connection between the valve and the pipeline or equipment is correct and appropriate, will directly affect the pipeline valve to run, run, drip, leak the probability of the phenomenon. Common valve connection methods include: flange connection, clamp connection, welded connection, threaded connection, sleeve connection, clamp connection, self-sealing connection and other connection forms. 1. flange connection: There are flanges at both ends of the valve body, which correspond to the flanges on the pipeline, and the flanges are fixed by bolts and installed in the pipeline. Flange connection is used more in the valve connection form. Flange has raised surface (RF), plane (FF), convex concave surface (MF) and so on. According to the shape of the joint surface can be divided

24

2018

/

12

Principles and precautions of valve pressure test

Valve production is a complex and simple process, the production of a good valve must go through a variety of performance testing, one of the most important test is pressure test. Pressure test is to test whether the pressure value that the valve can withstand meets the requirements of production regulations. Generally, the pressure test of the valve must comply with the following principles and precautions:(1) Under normal circumstances, the valve is not tested for strength, but the valve body and valve cover after repair or corrosion damage should be tested for strength. (2) the valve should be installed before the strength and tightness test. (3) During the test, the valve installation position should be in the direction of easy inspection. (4) Welding connection form

18

2018

/

12

Special casting of valves

The basic principle of 1. low-pressure casting valve Low-pressure casting is to inject molten metal into a sealed resistance crucible furnace for heat preservation. The mold is placed on the sealing cover, and the vertical riser pipe makes the metal liquid communicate with the downward gate. The mold is horizontal parting, and the metal mold must be preheated before pouring and sprayed with paint. During die casting, the upper half of the mold is locked first, and the compressed air is slowly introduced into the crucible chamber so that the metal liquid is pressed into the mold through the riser tube. After the mold is filled, the air pressure is compressed to the specified working pressure, and the appropriate time is maintained to crystallize the alloy under pressure. Then, the pressure on the liquid surface is removed, so that the riser and the gate are still.

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