How can I choose the best control valve?
The selection of the best control valve, which is a valve that stops the flow of liquids or gases in the opposite direction depends on the necessary valve materials and easy maintenance. Check the valves should be made by compatible materials for the product in contact with them. They should quickly stop the product of the product, which is the primary function of any control valve. The valves should work for a long time with small or no maintenance. When fluids or gases flow to the disk, it opens and allows the product to pass in the normal direction of flow. If the flow stops or is perverted for some reason, the product moves the disc to the closed position and prevents backflow.
The construction materials for industrial applications are very important to prevent valve control failure. Copper or brass -acid or caustic products may be required for water and chemics.or high -temperature plastics or composites.
Fast closure speed is important when choosing control valves, with a reduced decrease in pressure also consideration. These are primarily safety devices, because backward flow in chemical operations can cause damage to the equipment or hazardous conditions. The pressure drop is important because the valve that limits or limits the flow can cause operating problems and requires additional pumping power to overcome.
Simple design is a swing control that has a disk hanging from the hinge inside the body or valve housing. Normal flow keeps the disc open, but any reverse flow is pushing and holding the disc closed. They are cheap, have few moving parts and low pressure drop. This is common on drinking water systems to prevent contamination from groundwater if the pipeline breaks in the system.
tilting discussion valves are related to swivel valves fromThe actual disk moves. The disk has a rod passing horizontally, which is connected on each side of the valve housing. The rod passes through the top of the disk, so a greater weight of the disk is suspended under the rods. The product flows to the disk and holds it open. The tilting drive valves have more pressure drop than cream valves, but can be adjusted for different streams using the outer weights added to the rod called counterweight.
piston valves have a disk located horizontally on the upper part of the valve seat, as on the hole sitting plate. The product flows up through the disk and holds it open, but turns off the flow or the reverseness push the disk onto the seat. The upper part of the piston valve can be added the hand shaft and the valve handle to push down to the disk, allowing the return valve to act as a conventional stop valve.
Another type of inspection is the wafers valve. The valve has a thin disk mounted vertically in the body of the valve and holds it in a spring that pushes it on the valve seat. TheseThe valves are useful when very fast closure is needed, but due to the spring they will have a higher pressure drop.
Maintenance includes a test for determining the correct operation of the valve. Regular stalk valves are installed on each side of the control valve. Small pressure fittings are installed between stop and return valves and the air pressure can be added to both sides of the control valve with the closed valves. Pressure meters can be used to determine that the valve closes properly and does not allow the air to escape backwards.
Some valves can also be disassembled for checking or cleaning. This may be important if the processed product is corrosive or contains a solid material that can block the valve. They may have internal filters that block solids and prevent disk or lemukage or filters can be installed before the current before reaching the valve.