Pay attention to the following issues during the installation of the regulating valve:
Jun 23, 2019| Pay attention to the following issues during the installation of the regulating valve:
(1) Before the valve is installed, the dust accumulated during the storage of the valve must be carefully removed and kept clean during the installation process. Dust impurities can damage the seat and internals. To protect the cleaning, it is usually possible to attach a cover to the end of the open flange that is not welded that day.
(2) When the regulating valve is installed, the arrow on the valve body should be consistent with the flow direction of the medium.
(3) Regulating valves are precision components that will disrupt normal operation if they are stressed by pipe deformation. Therefore, the flange and pipe installation should be vertical and positionally accurate to avoid deformation of the pipe. Well, the pipe should be properly supported to prevent it from bending and deforming under the weight of the valve.
(4) The regulating valve must be specially handled when welding to the pipe. If the control valve is not adequately welded to the pipe and the stress is not removed, deformation will occur. When welding, the welding slag must be strictly prevented from splashing into the valve. The existence of the welding slag will damage the performance of the valve. If the splash directly splashes on the valve core, it will directly affect the action of the regulating valve, and damage the valve core and the valve seat.
(5) When the pipeline is tested and blown out, the regulating valve should be removed and connected with the corresponding straight pipe section to prevent the welding slag, iron cutting and other debris from getting stuck between the valve core and the valve seat. The removed flange end of the adjustment valve is tightly wrapped with plastic sheeting.
1) Extended working method
Let the regulator valve work as much as possible at the beginning, such as 90%. Thus, cavitation, erosion, and the like occur on the head of the spool. As the spool is broken, the flow rate increases, and the corresponding valve is closed again. This is continuously destroyed and gradually closed, so that the entire spool is fully utilized. At the same time, the large throttle opening throttle gap is large, and the erosion is weakened, which is better than the beginning. Let the valve work in the middle opening and small opening to increase the life by 1 to 5 times. If a chemical plant adopts this method, the service life of the valve is increased by 2 times.