1. Opening work
Let the control valve to start as far as possible to work on the maximum opening, such as 80%. In this way, cavitation, erosion and other damage occurred in the head of the spool. With the destruction of the valve, the flow increases, the corresponding valve to close a point, so the constant damage, and gradually closed, so that the entire spool fully used until the valve core and the sealing surface damage, can not be used so far. At the same time, degree of the work of cutting large opening gap, erosion weakened, which compared with the beginning let valve in the middle of the open degree and Little Cayman degree increases the life of 1 to 5 times. If a chemical plant using this method, the service life of the valve increased by 2 times.
2. Reduce the increase in job openings S
Reduced s, which increases the system the loss in addition to regulating valve, allocated reduce to the valve on the pressure drop, in order to ensure the flow through the valve, will inevitably increase the valve opening, while the valve on the pressure drop was reduced, reduced to cavitation, erosion is also reduced. Specific measures are: the valve orifice plate throttle, consumption pressure drop; off line in series with the manual valve, to adjust the valve to obtain a more satisfactory degree of work. The beginning of a major election in a small valve opening work, the use of this method is simple, convenient and effective.
3. To reduce the size of the work to increase the opening degree
By reducing the caliber of the valve to increase the work opening, the specific measures are: 1. For a small gear diameter of the valve, such as DN25 replaced by DN32; the body does not change, the replacement of the spool valve seat diameter. Such as a chemical plant overhaul when the throttle piece dg8 replaced dgl0, life increased by 1 times.
4. Transfer damage location
Shift the serious damage to the secondary position to protect the sealing surface of the spool valve seat and the throttle face.
