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The stem axis of the globe valve is perpendicular to the sealing surface of the valve seat. The opening or closing stroke of the valve stem is relatively short, and it has a very reliable cut-off action, making this valve very suitable for the cut-off or adjustment and throttling of the medium. Once the valve disc of the shut-off valve is in the open condition, there is no longer contact between its valve seat and the sealing surface of the valve disc, and it has a very reliable cut-off action.
This kind of valve is very suitable for cutting or adjusting and reducing the medium. Stream usage. Once the shut-off valve is in the open state, there is no contact between its seat and the sealing surface of the disc, so its sealing surface is less mechanically worn, because most of the shut-off valve seats and discs are easier to repair or replace
It is not necessary to remove the entire valve from the pipeline when sealing the components, which is very suitable for the occasion where the valve and the pipeline are welded together. The flow direction of the medium through this type of valve has changed, so the flow resistance of the stop valve is higher than that of other valves.
Commonly used Industrial valve pipe Suppliers valves are as follows: 1) Angle-type cut-off valve; in the angle-type cut-off valve, the fluid only needs to change the direction once, so that the pressure drop through this valve is smaller than that of the conventional structure of the cut-off valve. 2) Direct flow stop valve; In direct flow or Y-shaped stop valve, the flow passage of the valve body is in a diagonal line with the main flow passage, so that the damage degree of the flow state is smaller than that of the conventional stop valve, so the pressure loss through the valve is also corresponding Is too small. 3) Plunger type globe valve:
Earthy Yellow Custom Large Diameter Thin PPH Culvert Pipe Light Weight ISO Certificate DN15--DN600 Plastic Pipe Tube For Industrial And Chemical Usage
Place of Origin:Zhejiang, China
Brand Name:KXPV
Material:PPH
Specification:DN15--DN600
Length:5000mm
Standard:DIN
Connection:Hot melt
Packing:Plastic Film
Certification:ISO Certificate
Colour:Earthy Yellow
Usage:Chemical
Pressure:0.6-1.6Mpa
Delivery Time:7 Days
MOQ:1 Piece
Supply Ability:100000 Meter/Meters per Month
When selecting a single pneumatic actuator, according to the torque value calculated above and the pressure of the air source used, look for the torque at the end point in the spring return column (this torque is greater than the torque calculated above), and the accurate SR model can be obtained. For example: the air source pressure is 0.4Mpa, and a torque of 165N needs to be controlled after the above calculation. For m valves, first look up the spring return end point according to the table for a similar torque of 171N.m,
and then check to the left that the actuator model is SR160 (a total of 10 sets of springs are installed). Note: In the SR single-pneumatic output torque meter, the spring return 'end point' torque is the torque to close the valve, and the spring return 'start' torque is the torque to open the valve. The starting torque of the corresponding air source pressure is the torque of closing the valve state, and the end torque of the air source pressure is the torque of opening the valve.
AT Pneumatic Actuator Problem Handling Pneumatic valve can’t move 1. Whether the solenoid valve is normal, whether the coil is burned out, whether the solenoid valve core is stuck by the stolen goods, replace the solenoid valve, replace the coil, and clear the stolen goods 2. Check the single air supply of the actuator,
Whether PVDF valves is working normally, such as cylinder piston blow-by, cylinder block and end cover, or air leakage at the shaft, etc., disassemble the actuator to check whether the seal is damaged, and whether the cylinder bore surface is damaged. Replace the damaged seal ring, replace the cylinder or piston 3.
Evacuation, cavitation, or holding pressure for a long time, resulting in damage to the seal; (2) The actual output of the pump is too small, a large amount of medium is circulated in the pump, and heat accumulates, causing the medium to vaporize, resulting in seal failure; (3)
The recirculation flow is too large, which causes the sediment on the bottom of the suction pipe side container (tower, kettle, tank, pool) to appear and damage the seal; (4) For a long period of time out of service, there is no manual crank when restarting, and the friction pair is due to adhesion The sealing surface is torn; (5)
The corrosive, polymerizable, and gelling substances in the medium increase; (6) The ambient temperature changes sharply; (7) The working conditions are frequently changed or adjusted; (8) Sudden power failure or shutdown, etc. . If the centrifugal pump leaks suddenly during normal operation, if it cannot be found in time, it will often lead to larger accidents or losses, which must be paid attention to and effective measures must be taken. 2.
Several misunderstandings in the maintenance of pump mechanical seals 1. The greater the spring compression, the better the sealing effect. In fact, it is not the case. Excessive compression of the spring can cause rapid wear of the friction pair and instant burnout; excessive compression makes the spring lose its ability to adjust the end face of the moving ring, resulting in seal failure. 2. The tighter the sealing diagram of the moving ring, the better. In fact, too tight a dynamic ring seal is harmful and useless.
One is to pvdf tubing manufacturers the wear between the sealing ring and the shaft sleeve, and to leak prematurely; the second is to increase the resistance of the axial adjustment and movement of the moving ring, which cannot be adjusted in time when the working conditions change frequently; the third is that the spring is easily damaged due to excessive fatigue; It deforms the moving ring sealing ring and affects the sealing effect. 3