Blog

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.

04

2018

/

12

Assembly of valves

(1) the preparatory work before assembly: valve parts in the assembly before the need to remove the burr and welding residual welding slag, cleaning and cutting packing and gasket. (2) cleaning of valve parts: as a fluid pipeline to control the installation of the valve, the cavity must be clean. Clean the valve parts before assembly, and remove the chips, residual smooth oil, coolant and burrs, welding slag and other dirt on the parts. After grinding and polishing, the parts need to be cleaned finally. The final cleaning is usually to brush the sealing surface with gasoline, then blow dry with tight air and wipe clean with cloth. (3) Packing and gasket preparation: graphite

28

2018

/

11

Grinding of valves

The grinding of the valve includes the cleaning and inspection process; 1. The cleaning process cleans the sealing surface in the oil pan, using professional cleaning agent, and checks the damage of the sealing surface while washing. With the naked eye is difficult to determine the fine crack can be used to color inspection method. After cleaning, check the tightness of the valve flap or gate valve and the sealing surface of the valve seat with red and pencil. If the seal is not good, the standard plate can be used to check the valve flap or gate sealing surface and the valve body sealing surface respectively to determine the grinding part. 2. Grinding process The grinding process is essentially a cutting process without lathe. The depth of pitting or small holes on the valve head or valve seat is generally within 0.5mm,

28

2018

/

11

Grinding of valves

The grinding of the valve includes the cleaning and inspection process; 1. The cleaning process cleans the sealing surface in the oil pan, using professional cleaning agent, and checks the damage of the sealing surface while washing. With the naked eye is difficult to determine the fine crack can be used to color inspection method. After cleaning, check the tightness of the valve flap or gate valve and the sealing surface of the valve seat with red and pencil. If the seal is not good, the standard plate can be used to check the valve flap or gate sealing surface and the valve body sealing surface respectively to determine the grinding part. 2. Grinding process The grinding process is essentially a cutting process without lathe. The depth of pitting or small holes on the valve head or valve seat is generally within 0.5mm,

19

2018

/

11

Measures for plugging leakage of SMC solenoid valve

Before plugging the SMC solenoid valve, complete and set the required tools and equipment according to the relevant safety technical regulations, and wear protective equipment. They should meet the safety protection requirements of fire and explosion-proof, waterproof and oil-proof, anti-virus and anti-corrosion, anti-scalding and anti-freezing, anti-radiation and other working conditions. According to user needs, pneumatic actuators can be installed with the standard type of the opposite transmission principle, that is, the selected axis clockwise rotation to open the valve, counterclockwise rotation to close the valve. Safety measures for SMC solenoid valve plugging:(1)SMC solenoid valve plugging personnel should go deep into the site to understand the working pressure, temperature, medium and medium properties of the leak, and analyze the causes of the leak.

07

2018

/

11

Tubular check valve

Tubular check valve is a threaded hole, the pipe joint is screwed into the installation of the pipe, used in the hydraulic system to prevent the reverse flow of oil flow or used in the pneumatic system to prevent the reverse flow of compressed air. Check valve has straight-through and right-angle two. The straight-through check valve is installed on the pipeline with a threaded connection. Right angle check valve has three forms: threaded connection, plate connection and flange connection. Hydraulic control one-way valve is also called locking valve or pressure valve, which is the same as the one-way valve to prevent the reverse flow of oil. However, when the oil flow is required to flow in the reverse direction in the hydraulic circuit, the control oil pressure can be used to open the one-way valve so that the oil flow can flow in both directions. Hydraulic control check valve

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