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Regulating valve outset as far as possible at the power diesel generator opening, such as 90%. Thus, cavitation, erosion and other damage was done in the spool head. With spool destruction, increased traffic flow, the corresponding valve is then shut, which continue to disrupt the gradual closure of the entire spool fully used until the destruction of the spool roots and the sealing surface, can not be used so far. Open throttle gap, erosion weakened, and this increased life expectancy of 1 to 5 times more than the outset of the valve opening and small opening in the middle. Such as a chemical plant using this method, the life of the valve 2 times.
Growth throttle channel is the most simple is the radiator valve of the valve seat, valve seat hole growth, the formation of a longer throttle channel. Sudden expansion on the one hand enable the flow of closed type throttle delay, from the transfer of the failure location, away from the sealing surface of the role; on the other hand, increased the throttle resistance, reducing the pressure on the degree of recovery, so that cavitation is reduced. Some of them designed to seat hole stairs, wave, cavitation is to increase the resistance and weaken. This method is frequently used to improve the introduction of devices in the high pressure valve and the old valve, is also very effective.
Flow valve and cross-flow generator sets are variable resistance device, they are based on the differential pressure of the fluid as the driving force, and in accordance with the change of system conditions (differential pressure) and automatically change the drag coefficient to maintain the constant flow valve and the cross-flow The constant traffic of each branch to achieve a balanced distribution of the entire system flow, eliminating the Enthusiasm of the phenomenon. Sufficient conditions for the total flow in each branch flow changes do not affect each other, the system is relatively stable. Set the flow control valve and the constant flow control valve is: constant flow valve is only one valve, the feelings of the valve from the valve directly before and after the differential pressure, and implement actions to change the valve resistance, can be a “straight-acting variable ice machine , it can not regulate online traffic, the use of constant flow valve can not be implemented to change the total flow of energy-saving operation, and this constant flow valve there are not any expensive imports, the domestic heating system is rarely used in the past, only in some central seen in air-conditioning systems. Constant flow control valve based on the method of compensation, the change of resistance actions, which have both the valve, a valve flap for compensation before and after the orifice differential pressure, it can become a “compensation variable resistance valve The principle is: the use of the differential pressure before and after the orifice, as the driving force of the compensation action, compensation and to maintain the stability of the differential pressure before and after the orifice, thereby maintaining a constant flow, adjust the size of the orifice can get a different flow . Therefore, it can adjust the flow. To maintain constant flow, it is not only a constant traffic of each branch in the system, to achieve the balanced distribution of traffic, you can also change at any time and regulate the flow of each branch, to oil spill response equipments dynamic equilibrium in the system water conditions change. Each year in early winter to the end of the cold and cold to cold is two times of flow regulation, can be realized in phases to change the quality of traffic regulation, “power saving mode. Constant flow valve adjustment simple and convenient, but for larger systems, two times of adjustment is still a burden, and the constant flow control valve, the high price, although at that time can be recovered, but still larger psychological pressure.