( 1 ) The needle valve has good adjustment performance. Usually the adjustable range of the regulating valve is R = Qmaxmin = 10 ~ 30 , the good valve R is only 50 , and the adjustable range of the valve can reach 100 ~ 200 ; the small opening adjustment performance is better than the single seat, double seat, sleeve Much better, Kv is 2 to 3 times larger than single-seat, double-seat, and sleeve valves .
( 2 ) Good anti-blocking performance. The flow path is simple, the medium is straight through, and the medium is not turned and chamfered and is not easy to precipitate, and is especially suitable for high viscosity, suspension, pulp, granules, fibers and other dirty media.
( 3 ) Good cutting performance. Conventional valve, the sealing surface of the valve core and the sealing surface of the valve seat are 60° , 1 ~ 2mm cone surface fit. The concentricity, displacement and parallelism of the cone surface are particularly high, which is generally difficult to achieve, so it is usually leaked. The rate is up to 10-4 , and the precision assembly is 10-5 . The biggest feature of the needle valve is that the spherical valve core is tangent to the inclined surface of the valve seat, which becomes line contact, the contact area is small, and the spherical valve core can be automatically centered, which is easy to be good. Contact, so the leakage rate is usually up to 10-6 , precision assembly can reach 10-7 , the leakage rate of single seat, double seat, sleeve is increased by 100 ~ 1000 times, than the general hard seal ball valve leakage rate 10- 5 is also 100 times higher.
( 4 ) Overcome the pressure difference. The double seat valve and the sleeve valve allow a large pressure difference, but the leakage is large; the leakage amount of the single seat is small, but the pressure difference is all applied to the valve core, and the valve core is easily opened, so that the pressure difference is small. For example , the single seat valve of DNl00 allows a pressure difference of 0.75 MPa , and the allowable pressure difference of a double seat valve is 2.7 MPa . The spool of the needle valve is centered, and the resultant force of the medium on the core is extremely small for the center rotation. It is a rotary motion, and is multiplied by a rotation coefficient, so that the unbalance torque is smaller, so the cut-off pressure difference of the valve is large, and the maximum PN value can be obtained. (Shanghai Jinzexin Valve Co., Ltd.)
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