CN2149525Y

CN2149525Y - Air-corrosion-proof valve-plug

Info

Publication number: CN2149525Y
Application number: CN 93201944
Authority: CN
Inventors: 唐学美
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-01-15
Filing date: 1993-01-15
Publication date: 1993-12-15
Anticipated expiration: 2003-01-15

Abstract

The utility model relates to a cavitation erosion resistance cutoff / the valve core of a flow regulating valve. The utility model comprises a valve core rod and a valve core base; the valve core rod is matched with the conical surface of the valve core base. The matching length thereof is about the 4 to 9 times of the minimum diameter of the conical surface, and a cone angle is from 8 DEG to 12 DEG. Both ends of the conical surface of the valve core base and the head of the valve core rod are provided with a streamlined communicating zone with smooth blend; the pressure gradually changes when the liquid flows across the valve port under the operating conditions of high pressure difference for reducing the damage of the cavitation to the valve core generated from the large pressure change. The structure of the utility model can be used for cavitation erosion resistance valves with other requirements.

Description

Air-corrosion-proof valve-plug

The utility model relates to a kind of gasproof erosion spool, and especially a kind of gasproof erosion that is used under the High Pressure Difference operating mode ends/the throttle valve spool.

In synthetic ammonia installation, be 310kg/cm from pressure with ammonia ²Ammonia dissociator in to be discharged into pressure be 16kg/cm ²The ammonia collecting tank in, in this manufacturing process, use by/throttle valve (

44H-320 type, Lanzhou high pressure valve factory produce) valve core structure is as shown in Figure 1; Under the High Pressure Difference operating mode, when liquid (ammonia) flow velocity when the valve port increases, pressure descends rapidly, and pressure just produces cavitation erosion when dropping to the saturation vapor pressure of this liquid (ammonia), and simultaneously spool is produced impact force.Cavitation phenomenon has great collapsing force to valve; Under cavitation erosion and fluid power percussion, produce cellular pit on the spool, make valve lose due adjusting and cut-out ability.

The purpose of this utility model is to provide a kind of the use under the High Pressure Difference operating mode can reduce ending/the throttle valve spool that fluid power impacts, gasproof loses.

The purpose of this utility model can realize by following measure:

A kind of gasproof erosion that is used under the High Pressure Difference operating mode ends/the throttle valve spool, form by valve core rod and valve core case, valve core rod and valve core case cone match, the valve core rod head exceeds the circular cone fitting surface, and the streamlined commutating zone of rounding off is arranged, its cone match length is 3～9 times of conical surface minimum diameter; Cooperate 8 °～12 ° of conical surface cone angles; There is the streamlined commutating zone of rounding off at valve core case conical surface two ends.

During valve working, flow through valve core case and valve core rod commutating zone streamline of highly pressurised liquid is tending towards rule, the fluid power of spool is impacted reduce, and just velocity of liquid assets progressively accelerated, and progressively reduces pressure; Flow of liquid through between valve core case and valve core rod long and narrow Taper Pipe and during commutating zone, with circulation area change fluid pressure, flow velocity progressively changes; Fluid pressure descends gradually, suppresses cavitation erosion thereby play, and reduces the effect that fluid power impacts.

The utility model can suppress under the High Pressure Difference operating mode liquid to the cavitation effect of valve, reduces the destruction of cavitation erosion to valve, prolongs the working life of valve.

The utility model accompanying drawing drawing is described as follows:

Fig. 1 is known ending/throttle valve valve core structure figure

1---valve core rod 2---valve core case

(dot and dash line is represented the throttle valve spool)

Fig. 2 is the utility model gasproof erosion valve core structure figure

Fig. 3 is the valve mechanism schematic representation that the utility model gasproof erosion spool is installed

3---valve body

Below in conjunction with accompanying drawing the utility model is further described:

As shown in Figure 2: a kind of gasproof erosion that is used under the High Pressure Difference operating mode ends/the throttle valve spool, form by valve core rod (1) and valve core case (2), valve core rod (1) and valve core case (2) cone match, the valve core rod head exceeds the circular cone fitting surface, and the streamlined commutating zone of rounding off arranged, its cone match length is about 7 times of conical surface minimum diameter, 8 ° of fitting surface cone angles, there is the streamlined commutating zone of rounding off at valve core case (2) conical surface two ends, the utility model can be selected material for use according to different circulation mediums, as is used for emission intensity and can selects the 1Cr18Ni9Ti stainless steel for use, and adopt abrasive process to reduce the fitting surface roughness, spool is closely cooperated.

The utility model gasproof erosion spool can be according to valve body structure, change the profile of valve core rod (1) and valve core case (2), so that be installed in the existing standard valve body, corresponding various flows flux is mounted to the spool of series in the valve body of same bore or different bores, to satisfy different requirements.As shown in Figure 3: on the valve body of the standard bore of Dg10

When discharge value is 0.5T/h, be equipped with the spool of α=8 °, l=30mm, d=φ 4

When discharge value is 0.6T/h, be equipped with the spool of α=8 °, l=35mm, d=φ 5

When discharge value is 0.7T/h, be equipped with the spool of α=8 °, l=40mm, d=φ 6

The utility model structure also can be used for other and requires on the gasproof erosion valve.

Claims

1, the utility model relates to a kind of gasproof erosion spool, especially a kind of gasproof erosion that is used under the High Pressure Difference operating mode ends/the throttle valve spool, form by valve core rod (1) and valve core case (2), valve core rod (1) and valve core case (2) cone match, valve core rod (1) head exceeds the circular cone fitting surface, and the streamlined commutating zone of rounding off is arranged, it is characterized in that valve core rod (1) and valve core case (2) cone match length are 3～9 times of conical surface minimum diameter, 8 °～12 ° of fitting surface cone angles; There is the streamlined commutating zone of rounding off at valve core case (2) conical surface two ends.