Through engine control valve the two spool and two seats. The flow of fluid from the left side of the icon to the right side of the outflow after two spool and seat confluence.
Suffered upwards thrust and under spool on spool suffered downward thrust to the basic balance, therefore, the entire spool suffered unbalanced force. Through engine valve characteristics are as follows.
① suffered unbalanced force is small, allowable pressure drop, for example, DN100 double seat valves allow pressure 280 kPa.
② flow capacity, and comparison with other control valve of the same caliber, two-seat valve can flow more fluid, the same caliber double seat valve flow capacity than the single-seat valve flow capacity is about 20% -50 /%. For example, DN100 double seat valve flow capacity of 160. Therefore, in order to obtain the same flow capacity, seat valves can choose smaller thrust implementing agencies.
③ the positive body valve and anti-valve modification convenience. Double seat valve top-end dual-oriented, just plug and seat, in turn, to install positive body valve can be replaced by anti-body valves, valve instead of the anti-body positive body valve without the need for re-election to the implementation of institutional positive or reverse acting type. Figure 2-4 shows the two-seat valve structure simply reverse-mounting of the valve body, and connected with the valve stem to complete.
④ leakage volume. The upper of the double-seat valve, the valve body can not be simultaneously shut off, therefore, the larger the amount of leakage of the double-seat valve, the standard amount of leakage 0.1% C. Spool valve and valve seat of the two-seater the different village materials or for low or high temperature applications, the amount of expansion of the Village feed line, causing the leak amount will be greater.
(5) anti-erosion ability. Valve flow path within the complex, high differential pressure applications, more serious erosion by high pressure fluid, the fluid flashing and cavitation caused by high pressure differential, adding to the erosion of the valve body, seat valves does not apply applications place high pressure differential. Due to the complexity of the flow path, it does not apply to the control of the fiber-containing medium and high viscosity fluids.
Balanced sleeve valve can eliminate most of the static unbalance force, the advantages of the double seat valve has obvious shortcomings of its large leak more evident, therefore, in the process of industrial production, the original two-seat valve occasions, available the sleeve valve replaced with balanced structure, foreign manufacturers and the overall structure of the two-seat pass-through valve to reduce the amount of leakage products.
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