Control valve is an automated device for precise regulation of flow. Available in pneumatically operated type and electrically operated type. In this article, we will introduce to you how to install the control valve for your reference. Let’s check it out!
Read the manual
Read the Instruction Manual before installing the control valve. The instruction manual describes the product as well as safety precautions and precautions to be taken before and during installation. Following the instructions in the manual helps ensure a simple and successful installation.
Make sure the pipes are clean
Foreign bodies in the pipe may damage the sealing surface of the valve or even obstruct the movement of the Spool, ball or disc causing the valve not to close properly. To reduce the likelihood of hazardous conditions, all piping should be cleaned prior to installation of valves. Make sure the pipe has been cleaned of dirt, metal debris, welding slag and other foreign matter. Also, check the pipe flange to ensure a smooth gasket surface. If the valve has a threaded end, apply a high grade pipe sealant to the positive threads of the pipe. Do not apply sealant on female threads as excess sealant on female threads may be forced into the body. Excess sealant can cause the plug of the spool or the accumulation of dirt, which leads to the valve can not normally close.
Check the control valve regulator
Although valve manufacturers take certain steps to prevent shipping damage, such damage may occur and can be detected and notified prior to installation.
Do not install valves that are known to be damaged during transport and storage.
Prior to installation, check and remove all transport blocks, protective plugs, or lids on gasket surfaces, and inspect the inside of the valve body to ensure that there is no foreign matter.
Adopt good pipe connection practice
Most control valve regulators can be installed in any position, but the usual method is to position the actuator vertically and above the valve. If horizontal actuator installation is necessary, consider adding an additional vertical support to the actuator. Ensure that the body is installed in such a way that the flow direction is consistent with the direction indicated by the flow direction Arrow or the instruction manual.
Make sure there is enough space above and below the valve to easily remove the actuator or spool during inspection and maintenance. The space distance is usually found on the dimensional drawing identified by the valve manufacturer. For flanged bodies, ensure that the flange faces are aligned so that the gasket surfaces are in uniform contact. After the Flange is centered, gently tighten the bolts, tightening them in a staggered fashion.
Proper tightening will avoid uneven gasket load and help prevent leakage, as well as the possibility of flange damage or even cracking. When connecting flange and valve flange material is not the same, this preventive measures is particularly important.
Pilot tubes installed upstream and downstream of the control valve regulator help to check flow or pressure drop. Connect the pressure relief pipe to a straight pipe section away from the elbow, necking, or expanding. This position reduces inaccuracies due to fluid turbulence. Connect the pressure joint on the actuator to the controller with a 1 / 4 or 3 / 8 inch 6-10 mm pipe. Keep the connection distance short and minimize the number of fittings and elbows to minimize system time lag. If this distance must be long, a positioner or supercharger may be used on the control valve regulator
Post time: Dec-15-2021