Conventional control valve control valve installation requirements

   A control valve should be installed vertically upright on a horizontal pipe. Nominal diameter around DN≥80mm control valve on the pipe should have a permanent stand.

   2 control valve installation location should be convenient for operation and maintenance, if necessary, should set the platform.

   3 control valve piping should be a combination of a compact structure, easy operation, maintenance and drainage.

   Part 4 of the upper and lower control valve should allow sufficient space to remove the lower flange and plug actuator and trim below the valve during maintenance.

   5 When the control valve for high viscosity, easy to crystallize, easy and cryogenic fluid vaporization, should take appropriate measures insulation measures and antifreeze.

   6 control valve for ambient temperature is generally no higher than 60 ° C, not lower than -40 ° C applications.

   7 When the valve is installed in the vibration occasions, anti-vibration measures should be considered.

   8 who have not installed the positioner control valve, the film should be installed a control signal indicating the head of a small pressure gauge.

   When the control valve 9 for containing high suspended solids and viscosity of the fluid should be flushed with management.

  10 control valve should be installed so that the media attention to the direction of the arrow by the calibration flow through the valve.

  11 check valve should be checked and installed in the pipeline purging.

Control valve bypass

       One of the following conditions should be set Bypass:

(1) the corrosive fluid;

The (2) Article 2, paragraph 8.2.3 Trim serious wear for the occasion;

(3) other important occasions, such as boiler feedwater regulating valve.

  2 The following cases may not be bypassed:

(1) clean fluid;

(2) nominal diameter DN> 80mm occasions;

(3) control valve failure or maintenance, the process does not cause an accident situations;

(4) the process is not allowed or can not use the bypass valve operation occasions. For example: Emergency interlock vent valve and fluid slurry and so easy crystallization.