CN2045448U

CN2045448U - Adjustable sealing specific pressure slurry valve

Info

Publication number: CN2045448U
Application number: CN 89205003
Authority: CN
Inventors: 王佐才
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-04-17
Filing date: 1989-04-17
Publication date: 1989-10-04

Abstract

The utility model discloses an adjustable sealing specific pressure slurry valve, which belongs to a side sealing flashboard slurry valve. An adjustable sealing specific pressure screw bolt is arranged on the valve body at the outside of the valve. The sealing specific pressure of the valve can be adjusted through adjusting the screw bolt. The self-sealing structure is adopted at the same time. The sealing specific pressure can be increased by means of the pressure of the flow medium to make the valve shut close in a long time and impurities can not go into the sealing face. The service life can be extended. The utility model is used for cutoff of the two-phase flow medium.

Description

Adjustable sealing specific pressure slurry valve

The utility model relates to a kind of Parallel Slide Valves of adjustable seal pressure, belongs to a kind of side sealing flashboard Parallel Slide Valves.

The side sealing flashboard Parallel Slide Valves that early sixties has just come out as far back as this century still was widely used in so far to all two-phase flow medium damming in course of conveying (referring to 1988 the 4th phases of " valve " magazine) such as ore pulp, coal slurry, mud, lime-ash slurry, paper pulp.The core of side sealing flashboard Parallel Slide Valves is made up of valve body and the valve seat clamping flashboard shape flap that is embedded with seal.The flashboard shape flap of this kind valve contacts with seal in switching process all the time, in case the solid particle in the fluid stopping body enters sealing surface, but when in system, using, when valve switch for several times or after tens times repeatedly, because the wearing and tearing between sealant surface and lock lobe always produce the gap gradually, and solid particle are infiltrated with fluid, from and quickened wearing and tearing to sealing surface, valve is damaged.With the power station to be used for this gate valve that lime-ash slurry dams be that its mean lifetime of example was at 2500 hours.

Defective for above-mentioned known valves, the purpose of this utility model is to propose a kind of valve body structure that keeps the close contact of long period by seal and keep enough seal pressures that makes between valve seat and flap, with the infiltration of solia particle in the minimizing two-phase flow, thus the service life of prolongation valve.

Specific embodiments of the present utility model is described below in conjunction with the accompanying drawings:

The utility model adopts the packaged type valve seat, promptly be not closed completely and cause when leaking when seal on the valve seat (9) wearing and tearing, adjust to the unlikely leakage of valve with the adjustment bolt of adjusting seal pressure, the adjustment bolt (13) of adjustable seal pressure just is housed on the outside valve body (6,7) of valve seat (10), and this is first point of essential characteristic of the present utility model.

Valve seat (10) was close on the valve body originally, when valve is not closed completely because of sealing surface wear, undertaken after seal pressure adjusts by adjusting bolt, valve seat and valve body will be thrown off several gaps, form D chamber (as shown in Figure 2), the two-phase flow medium that has certain pressure in the pipeline will enter the D chamber, if radially and between the valve body not sealed of valve seat, then the two-phase flow medium will leak therefrom.For this reason, in the radially selfsealings in addition of valve seat; Promptly add seal ring (8) between the radially same valve body (6,7) of valve seat (10), in order to make the sealing circle certain elasticity is arranged, it makes the various forms of polymorphic structure.This constitutes second point of the utility model essential characteristic again.

The utility model also has a feature to be: the surface of contact of valve body (10) and seal ring is done tapered, and this is for when valve seat (10) moves inward because of adjusting bolt (3) effect, and seal ring (8) is compressed, and guarantees seal action.

So, after adjustment bolt (13) is adjusted, as shown in Figure 2, valve seat and left and right sides valve body are thrown off several gaps, the effect of the stuffing box packing (11) of screw thread on seal ring (8) and the adjustment bolt cause the medium that has pressure in the pipe to enter the D chamber, owing to can not leak out medium.The space of the utility model valve seat upper half part and lower half portion (being the C chamber) is in equipment running process, all communicate with atmosphere, so between D, C two Room, just constitute a pressure difference, act on the annulus area between the AB, this just forms an additional force and passes to seal (9) by valve seat (10), that is to say, strengthened seal pressure by the pressure of flowing medium again.

Seal described in the utility model, seal ring and stuffing box packing Material Selection are different and different according to the pressure parameter of working medium and pH value, if be working medium with the lime-ash slurry of power station, its discharge pressure is 10 kilograms per centimeter ², then seal and seal ring can select for use polytetrafluoroethylene to be advisable, and the stuffing box packing of adjusting in the bolt thread then can be selected graphite elasticity packing for use

The utility model provides two width of cloth accompanying drawings, is respectively described below:

Fig. 1 is the utility model overall structure front section view

1, stop nut 2, traveling nut 3, bearing 4, support

5, valve rod 6, left valve barrel 7, right valve barrel 8, seal ring

9, seal 10, movable valve seat 11, stuffing box packing

12, gland 13, adjustment bolt 14, flap 15, pressing plate

Fig. 2 is the utility model sealing configuration partial schematic sectional view.

The utility model in (damming such as the power plant lime-ash slurry) process of damming of two-phase flow medium, has overcome the defective that original Parallel Slide Valves reduces service life because of wearing and tearing effectively, and the more original life of valve of valve of the present utility model improves 10 times.

Claims

1, a kind of adjustable seal pressure Parallel Slide Valves by valve body be embedded with the valve seat of seal, and is made up of the flashboard shape flap of its clamping, it is characterized in that:

A, on the valve body [6,7] in valve seat [10] outside, the adjustment bolt [13] of adjustable seal pressure is housed, adjust in the screw thread of bolt [13] and be added with stuffing box packing [11];

B, at radially and between the valve body of valve seat [10], elasticity special-shaped seal ring [8] is housed;

C, seal ring [8] are tapers with the radially surface of contact of valve seat [10].