Instal the new Disassembly3/8/2024 ![]() Renew the valve stem packing if control valve has been in service beyond normal maintenance interval with packing showing signs of wear. To reduce maintenance time refer to proper drawing and follow the steps shown below for applicable maintenance. Place control valve in operation in accordance with the operating instructions provided with controller or other operating device. Return manual operating devices to its stand-by position. ![]() Manually operate control valve fitted with manual operating devices through the rated travel range to check freedom of movement. Rated travel is shown by the position of the indicator on the valve stem relative to the indicator plate scale on the yoke. Movement check:Ĭheck if control valve responds properly through rated travel in relation to the changes in operating pressure in the diaphragm. Isolation:Ĭlose inlet and outlet stop valves. ![]() Recommended piping for the compressible fluids with large pressure drop (control valve outlet pressure equals 25% or less of inlet pressure) across the control valve is as follows: – Expand outlet pipe to twice the control valve inlet pipe size. ![]() Maximum allowable operating pressure for diaphragm actuators is 4 kg/cm² (60 psig). Air tubing:Ĭonnect air tubing between the controller and diaphragm actuator or the valve positioner (if one is in use). Set a bypass around the control valve for emergency use when the control valve needs to be isolated. Stop valves (and gauges if necessary) in inlet and outlet lines are to be installed to provide means for checking, adjustment or emergency maintenance during operation. In case other strainer is installed upstream line, this strainer may be deleted. To be installed between the inlet block valve and control valve. Work spaces around the control valve body are to be provided sufficiently for easy removal or reinstall of parts during maintenance.Ĭaution: Piping systems are to be flushed thoroughly with sufficient amount of water or air prior to installation of control valve body and strainer to prevent possible damage on the internals by foreign materials after commissioning. Upright positioning of control valve is preferable for ease of maintenance. Set control valve in the horizontal line of piping in an accessible location with the arrow on the side of the valve body in the direction of fluid flow. Control Valve Installation, Maintenance, Disassembly & Reassembly A. ![]()
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