CN2169746Y

CN2169746Y - Fast cut-off gate valve

Info

Publication number: CN2169746Y
Application number: CN 93211453
Authority: CN
Inventors: 黄瑞祥; 黄瑞斌
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-04-26
Filing date: 1993-04-26
Publication date: 1994-06-22
Anticipated expiration: 2003-04-26

Abstract

The utility model belongs to the structure improvement of a gate valve with a gate plate in an old wedge type, which is characterized in that the sealing mechanism of the gate valve adopts two gate plates in a wedge type, two expansion blocks in a wedge type and other components. The gate plate in a valve body and the expansion blocks are connected by a T-shaped slot. The two expansion blocks and a valve handle are connected by the T-shaped slot and conduct centering by the spherical surface on the lower end of the valve handle. The utility model has the advantages of rapid opening and closing speed, labor saving, good sealing performance, novel structure, light weight, safe use and long service life. The utility model is suitable for the emergency breaking or discharge of the conveying pipeline of gas and liquid medium and can also conduct the automatic program control of long distance.

Description

Fast cut-off gate valve

The utility model belongs to the architecture advances design of old-fashioned gate valve, and it is applicable to the emergency cut-off of gas, liquid medium conveyance conduit or releases, and especially is fit to far distance automatic program control.

It is 10 ° that the gate valve of China's production at present generally uses its angle of wedge of the manual Wedge gate valve of the Single disc twin-tub pneumatic band of series, the wedge-type sealing mechanism that also has adopts parallel flashboard, but it is no matter the sort of, the surface of contact of their Sealing flashboard and seal ring is broad all, the static pressure and the medium-tight power that are subjected to medium like this on the flashboard are bigger, strength required when gate valve opens and closes is just big, generally could open journey smoothly with twin-tub or increasing cylinder diameter.And the complex structure of gate valve, heavy again.

Task of the present utility model is exactly at the shortcoming in the above-mentioned gate valve, and a kind of keying speed is fast, labour-saving wedge-type fast shut-off gate valve and design.Pneumatic, the manual switch mechanism of gate valve are located at the valve middle part simultaneously, are convenient to manually-operable, and especially install at the scene of heavy caliber gate valve, can not dispose operating platform, saves construction investment.

For solving above-mentioned task, the solution that the utility model adopts is: adopt two wedge-type flashboards and seal ring activity to cooperate in Gate-valve sealing mechanism, its angle of wedge is 10 °, should there be two wedge-types to rise by piece mutually by T-slot and the flexible connection of wedge-type flashboard, the angle of wedge of two pieces that rise is 20 °, two pieces that rise are connected with valve handle activity by T-slot equally, and with the centering of the sphere of valve rod lower end, it freely rotates around sphere, and make flashboard and seal ring that can be firm be fitted, sealing is reliable, piece and flashboard area of contact are little because this rises, and directly be not subjected to the influence of medium-tight power, only be subjected to the influence of medium static pressure, two pieces that rise rise with valve rod earlier during startup, big damper is loosening, big damper just rises when two rise by piece rising certain position, so the hoisting capacity of this gate valve reduces, thereby realization fast opening and closing, according to calculating, fast 5～6 times of the Pneumatic gate valve of the present domestic use of cut-out gate valve time ratio, laborsaving about about 11 times, this valve also has rational in infrastructure, in light weight, safe and reliable, advantages such as the life-span is long.

Below in conjunction with drawings and Examples the utility model is described in further detail.

Fig. 1 is an example structure elevation cross-sectional view of the present utility model.

Fig. 2 is the partial enlarged drawing of valve stem seal mechanism I among the utility model Fig. 1.

Fig. 3 is the partial enlarged drawing of Pneumatic and manual switching mechanism II among the utility model Fig. 1.

Fig. 4 is the partial enlarged drawing of locking framework III among the utility model Fig. 1.

As Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, wherein, valve body 1, cushion block 2, flashboard 3, piece 4 rises, seal ring 5, gasket seal 6, valve gap 7, valve rod 8, Packing seat 9, stuffing box packing 10, Gland 11, pin with hole 12, pin 13, swing bolt 14, nut 15,41, support 16, ratch 17, jump ring 18, cushion rubber 19,20,26,29,31, piston 21, and cap 22, the attaching nut 23, indicating arm 24, cylinder 25, pad 27,30,37,39,42, location plug screw 28, axle sleeve 32, snap ring 33, screw 34, stud bolt 35, gear shaft 43, handwheel 44, Xiao Zi 45, handwheel pad 46, nut 47, thrust lining 48, screw 49, gland 50, lining 51, right cover 52, left side cover 53, screw mandrel 54.

As Fig. 1, Fig. 2, Fig. 3, fast shut-off gate valve shown in Figure 4 has valve body 1, valve gap 7, valve rod 8, seal assembling connecting piece between each member of valve rod opening/closing mechanism and gate valve, it is characterized in that it is that to cooperate the angle of wedge of two shoe brake plates 3 with the seal ring activity be 10 ° for 5 ° wedge-type flashboard 3 that the wedge-type sealing mechanism adopts two wedge half-angles, it is that 10 ° the wedge-type piece 4 that rises is 20 ° by the angle of wedge that T-slot and flashboard 3 flexibly connect two pieces 4 that rise that two wedge half-angles should be arranged mutually, two pieces 4 that rise flexibly connect by T-slot and valve rod 8 equally, and with the centering of the sphere of valve rod 8 lower ends, it freely rotates around sphere, and make flashboard and seal ring that can be firm be fitted.Control for convenience and operation the utility model have also been done a little improvement on the valve rod opening/closing mechanism, the middle part that manually is arranged on valve with gate valve with pneumatic switching mechanism II, promptly be provided with switching mechanism II such as Fig. 3 on ratch 17 right sides, ratch 17 adopts gear engagement with the gear shaft 43 of handwheel 44, piston 21 in the gate valve cylinder 25 is connected with ratch 17 and indicating arm 24 respectively, be provided with locking framework III such as Fig. 4 in the left side of ratch 17, these mechanisms are provided with and make valve can both realize pneumatic and manual switch under any state, when pneumatic system breaks down, handwheel 44 manually-operable of can meeting an urgent need is used, the pinning that the locking framework III is firm with ratch 17.Ratch 17 is connected with snap ring 33 with valve rod 8 usefulness axle sleeves 32, is convenient to dismounting and stuffing box packing 10 replacings.Cylinder 25 adopts pent-roof, and good seal performance is safe in utilization.Cylinder 25 usefulness jump rings 18 are connected with support 16, and are promptly simple, easy to maintenance reliable.The utility model also adopts flame-proof type Electromagnetic Control case to control pneumatic channel, and is respectively to the inflation of cylinder 25 cavitys, promptly practical simply again.On being following of cylinder, cylinder 25 tops and support 16 tops are provided with the piston position signal recoverable capsule, but this signal recoverable capsule electric consumer upper stroke switch serves as, and connect with the air-powered electromagnetic control box, piston 21 travel position signal feed back are arrived the control room, in time provide the gate valve working condition to operator, and can be by the supervision of barometer or voltage regulating meter is controlled.

Claims

1, a kind of fast shut-off gate valve, have between valve body, valve gap, valve rod, valve rod opening/closing mechanism and each member of gate valve and seal assembling connecting piece, it is characterized in that Gate-valve sealing mechanism adopts two wedge-type flashboards (3) and seal ring (5) activity to cooperate, its angle of wedge is 10 °, should there be two wedge-types to rise by piece (4) mutually by T-slot and wedge-type flashboard (3) flexible connection, the angle of wedge of two pieces that rise (4) is 20 °, two pieces that rise (4) flexibly connect by T-slot and valve rod (8) equally, and, can freely rotate around sphere with the centering of the sphere of valve rod (8) lower end.

2, fast shut-off gate valve according to claim 1 is characterized in that cylinder (25) adopts the pent-roof cylinder.

3, fast shut-off gate valve according to claim 1 and 2 is characterized in that cylinder (25) is to be connected with support (16) with jump ring (18).