Median performance of the spvalve The three-way and three-way five-way change valve of various holding methods, when the spool is at both ends, the connecting situation of each oil port is called the median performance of the change valve.

Its rare use of "O", "H", "P", K "," M " and so on.

When analyzing and choosing the median performance of the three reversing valve, usually consider: (1) When the system pressure protection P heart is blocked, the system pressure protection, and the hydraulic pump is used for multi-cylinder solution.

(2) The P port is connected with the T port, and the system is unloaded. Type

(H K X M) (3) The transition accuracy A and B is blocked, and the west of the transition is unstable, but with high precision; A and B are all T port, the transition is stable, but the precision is low.

(4) When opening the outer position of the stability valve, a cavity of the hydraulic cylinder passes the oil tank, and there is sufficient oil and slow flushing, and the bearing is unstable.

(5) The hydraulic cylinder floats and ends in the free position 2) Liquid energy of the astringent valve From the law of dynamic mass of fluid flow, the fluid power applied on the valve core has two kinds: steady state liquid power and transient fluid power.

(1) Steady state liquid energy: after the valve movement moves, before the tooth is fixed, the movement of the valve center changes and the force under the valve movement without closing the valve port, which has nothing to do with the source quality of the valve.

(2) Transient liquid energy: in the process of movement of the sliding valve, the force of the valve cavity liquid source acting on the valve spool due to deceleration or acceleration has nothing to do with the movement speed.

3) Hydraulic cassette scene Casone fruit: the warmth is reduced, the valve core shrinks; but the function of the radial imbalance force of the transformer is: A the appearance error between the valve core and the valve body, shaft line oblique but not sink B core fruit reduction error with no inverted cone, shaft line oblique but not sink No part of the c valve core name rise Method of increasing the radial imbalance force: 1) Improve the production and disassembly accuracy