Blog

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

29

2018

/

10

High quality stainless steel globe valve

Stainless steel cut-off valve opening and closing parts is a plug-shaped valve, the sealing surface is flat or conical, the valve along the center line of the fluid for linear motion. The movement of the stem, there are lifting rod type (stem lifting, hand wheel does not lift), there are lifting rotating rod type (hand wheel and stem rotating lift, nut is located on the valve body). Stainless steel globe valve is only suitable for full opening and full closing, not allowed to adjust and throttle. Stainless steel cut-off valve is a forced seal valve, so when the valve is closed, pressure must be applied to the disc to force the sealing surface does not leak. When the medium enters from below the disc, the resistance that the operating force needs to overcome is the resistance of the valve stem and the packing.

23

2018

/

10

Relationship between valve diameter and medium flow rate

Valve flow and flow rate mainly depends on the diameter of the valve, but also with the structure of the valve on the resistance of the medium, at the same time with the valve pressure, temperature and the concentration of the medium and other factors have a certain intrinsic link. The flow area of the valve is directly related to the flow rate and flow rate, and the flow rate and flow rate are two interdependent quantities. When the flow rate is constant, the flow rate is large, and the flow channel area can be smaller; the flow rate is small, and the flow channel area can be larger. On the contrary, the flow channel area is large, its flow rate is small; the flow channel area is small, its flow rate is large. The flow rate of the medium is large, the valve diameter can be smaller, but the resistance loss is large, and the valve is easily damaged. Large flow rate, easy to flammable

15

2018

/

10

Butt welding bellows globe valve product structure characteristics

Main features of 1. butt-welded bellows globe valve: 1. Reasonable product structure, reliable sealing, excellent performance and beautiful appearance; 2. Surfacing Co-based hard alloy with sealing surface, wear resistance, corrosion resistance, good friction resistance and long service life; 3. Rod tempering and surface nitriding treatment have good corrosion resistance and friction resistance. 4, double seal, more reliable performance; 5. The lifting position indication of the valve stem is more intuitive. 6. The material of the parts, flange and butt welding number and size can be reasonably selected according to the actual working conditions or user requirements to meet various engineering needs. 2. butt-welded bellows globe valve product range: main material: carbon steel, stainless steel

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