CN2584969Y

CN2584969Y - Balance stop valve

Info

Publication number: CN2584969Y
Application number: CN 02286258
Authority: CN
Inventors: 周新亚
Original assignee: FALANTE VALVE Co Ltd NINGBO
Current assignee: FALANTE VALVE Co Ltd NINGBO
Priority date: 2002-11-22
Filing date: 2002-11-22
Publication date: 2003-11-05
Anticipated expiration: 2012-11-22

Abstract

The utility model relates to a balancing stop valve, which is improved on publicly known technology. Namely, a valve flap is positioned at an outlet side of a valve seat, and the outer side of a valve cap is provided with a supporting seat used for supporting a valve rod. The valve rod out of the valve cap is provided with a convex ring used for stopping the valve rod moving down, and the lower end of the valve rod is connected with a piston via screw connection. Since the valve rod is provided with the convex ring used for stopping the valve rod moving down, the lower end of the valve rod is connected with the piston via screw connection, and thus the valve rod can rotate without moving up and down when a hand wheel rotates, namely in a hidden rod way. Therefore, the height of the stop valve can not be increased with the opening of the valve, and the stop valve has the advantages of small external dimension and convenient installation. Simultaneously, the valve flap is positioned at the outlet side of the valve seat, sealed position is stable, and thus the balancing stop valve has good sealing performance and long service life. In addition, the stop valve is provided with a valve opening index mark used for controlling flow rate as required, and the balancing stop valve can be utilized conveniently.

Description

The balanced type stop valve

Technical field

The utility model relates to the valve in a kind of fluid delivery pipeline, especially refers to a kind of balanced type stop valve that fluid-transporting tubings such as water, gas are used that is suitable for.

Background technique

At present, stop valve is in transporting water, indispensable equipment in the delivery lines such as gas, be to be used for the opening and closing of controlling plumbing fixtures media flow, and the existing multiple pattern of existing stop valve, as the utility model patent of China number is that 88213508.2 " a kind of high pressure balanced type stop valves " are exactly wherein a kind of, it comprises valve body, the piston that cooperates with valve seal, the equalizing orifice of processing on the piston, counter balance pocket, the pressing plate that the piston lower end is fixing, valve gap and handle, big nut and leading screw, the upright post type guide mechanism also is installed between valve gap and piston, this guide mechanism is by constituting in guide positioning pin on the valve gap and the locating slot processed on piston by screwed connection, because counter balance pocket has balanced the upthrust of most of medium to piston, thereby it is lighter to operate, flexibly; But because handle is to drive the big nut rotation of rolling together, when handle rotates, just force leading screw up or down, be that screw mandrel is the rising stem (RS.) formula, the total height of stop valve can increase along with the aperture of valve and increase like this, even increased the groove on guide mechanism and the piston in its scheme, also can't make the boundary dimension compactness, can make above-mentioned stop valve structure complexity on the contrary, processing inconvenience, be difficult for installing, and the sealing surface between pressing plate and the valve seat is taper, and this not only requires the machining accuracy height, and after repeatedly using, owing to factors such as friction have influenced the sealing of its conical contact face, thereby shortened the working life of this stop valve.

Summary of the invention

Technical problem to be solved in the utility model is the defective that overcomes prior art, provide that a kind of boundary dimension is little, long service life by equilibrium valve.

The utility model solves the problems of the technologies described above the technological scheme that is adopted: this balanced type stop valve comprises valve body, valve rod, it is enterprising to be positioned at valve body, the valve seat of outlet caliber jointing place, take off with valve body and to close the valve gap that is connected and to be positioned at piston cylinder on the valve body, described piston tail is fixed with the flap that opens and closes valve seat, form piston cavity between described piston and the valve gap, described piston is provided with the penetration hole that is communicated with piston cavity and import caliber, described valve rod upper end is fixed with handwheel, the lower end is passed valve gap and is linked to each other with piston, it is characterized in that described flap is positioned on the valve seat outlet side, described valve gap arranged outside has the supporting base of supporting valve rod, the outer valve rod of described valve gap is provided with the protruding circle that stops valve rod to move down, and the lower end of described valve rod is connected with piston thread.

Described piston-rod lower end can be connected with flap by valve petal shelf.

Can be provided with seal ring between described piston rod and the valve petal shelf.

The described valve gap outside can be fixed with and show that flap opens and closes the label of valve seat.

Described label comprises indicator board that is fixed on the valve gap and the nut that is enclosed within on the valve rod of the valve gap outside, and described nut radially is provided with the pointer that cooperates with indicator board.

Described supporting base is threaded with valve gap.

Described supporting base by the Stuffing box that is threaded with valve gap, between Stuffing box and valve rod filler and be placed in the nut that compresses Stuffing box on the valve rod and form.

Compared with prior art, advantage of the present utility model is: because valve rod is provided with the protruding circle that stops valve rod to move down, and the lower end of valve rod is connected with piston thread, thereby when handwheel rotates, valve rod rotates and not upper and lower moving, and is blind rod type, and the height of stop valve can not increase with the unlatching of valve like this, thereby the boundary dimension of stop valve is little, is convenient to install; Simultaneously, flap is positioned on the valve seat of valve seat outlet side, and the sealing position is stable, good seal performance, thereby long service life; On stop valve, be provided with the valve opening cue mark in addition, the flow of control media as required, it is more convenient to use.

Description of drawings

Fig. 1 is the utility model structural representation;

Embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

As shown in Figure 1, the stop valve of present embodiment comprises valve body 2, valve rod 21, be positioned at that valve body is 2 enterprising, valve seat 7, valve gap 12 and the piston cylinder 11 of outlet caliber 1,8 jointing places, described piston cylinder 11 is positioned on the valve body 2 of valve gap 12 inboards, piston 6 in the described piston cylinder 11 is sealed and matched with it by seal ring 9, described piston 6 afterbodys are with valve petal shelf 25 outward, in order to prevent to leak, between the two, be provided with seal ring 26, be fixed with the flap 3 that opens and closes valve seat 7 by flap gland 4 on described valve petal shelf 25 bottom surfaces; Form piston cavity 23 between described piston 6 and the valve gap 12, described piston 6 is provided with the penetration hole that is communicated with piston cavity 23 and import caliber 1, in the present embodiment, described penetration hole is made up of two access ramps 10 between straight passage 5 and connection straight passage 5 and the piston cavity 23, and the hole that described straight passage 5 extends to piston cavity 23 is a tapped hole 24; Fix with screw rod by O RunddichtringO sealing back between described valve gap 12 and the valve body 2, described valve gap 12 is threaded with the supporting base that is positioned at its outside, the valve rod 21 that the lower end is provided with screw thread by supporting base, pass valve gap 12 and be connected with tapped hole 24 on the piston 6, and be provided with protruding circle 22 on the valve rod 21 outside described valve gap 12, described protruding circle is positioned on the concave station of valve gap 12, make valve rod 21 can not upper and lowerly move, and be fixed with handwheel 20 by nut in the upper end of valve rod 21 around its rotational; Described supporting base comprises Stuffing box 13, the filler 14 between Stuffing box 13 and valve rod 21 that is threaded with valve gap 12 and is placed in gland nut 15 outside the valve rod 21 that described gland nut 15 compresses filler 14 and Stuffing box 13 by retainer ring 16; In order to show the unlatching size of valve, thereby the flow of control media, on the valve rod 21 between gland nut 15 and the handwheel 20, be with the travelling nut 17 that is threaded with valve rod 21, and be fixed with the indicator board 19 of a band cue mark in described valve gap 12 outsides, and radially be fixed with the pointer 18 that cooperates with mark on the indicator board 19 at travelling nut 17.

When opening valve, rotate handwheel 20, driving valve rod 21 rotates together, because the protruding circle 22 of valve rod 21 is kept off by valve gap 12, thereby valve rod 21 can only rotate and can not move up and down, pressure owing to suction side equates by the pressure of penetration hole with piston cavity 23 simultaneously, so the rotation of valve rod 21 must overcome the pressure of piston cavity 23, drive travelling nut 17 and piston 6 rotations, and utilize reservation shifting amount between valve rod 21 and the piston 6, make and move on the piston 6, move on moving valve petal shelf 25 of the last shipper pole of piston 6 and the flap 3, like this, the medium of suction side flows out from outlet side by valve seat 7, and promptly valve is in opening state; Travelling nut 17 drives on the pointer 18 and moves simultaneously, and institute's digit synbol is promptly represented the unlatching size of valve on pointer 18 and the indicator board 19.

When throttle down, also rotate handwheel 20, driving valve rod 2 rotates, in like manner Ci Shi valve rod 21 also can only rotate and can not move down, because the pressure of piston cavity 23 equates with the pressure of suction side, and the area of piston 6 is greater than the area of valve seat 7 bores, so carry out the hermetically closing of valve by the energy of hydraulic pressure itself, thereby rotation hand wheel 20 very easily, drive piston 6 and move down, make the flap 3 that is fixed on the piston 6 close valve seat 7.Simultaneously travelling nut 17 also moves down, and pointer 18 moves down thereupon, and the mark from the pointer 18 indication indicator boards 19 is closing of valve as can be known.

Claims

1, a kind of balanced type stop valve, it comprises valve body (2), valve rod (21), it is enterprising to be positioned at valve body, outlet caliber (1), (8) valve seat of jointing place (7), take off with valve body and to close the valve gap (12) that is connected and to be positioned at piston cylinder (11) on the valve body, described piston (6) afterbody is fixed with the flap (3) that opens and closes valve seat (7), form piston cavity (23) between described piston (6) and the valve gap (12), described piston is provided with the penetration hole that is communicated with piston cavity (23) and import caliber (1), described valve rod (21) upper end is fixed with handwheel (20), the lower end is passed valve gap (12) and is linked to each other with piston (6), it is characterized in that described flap (3) is positioned on valve seat (7) outlet side, described valve gap (12) arranged outside has the supporting base of supporting valve rod (21), the outer valve rod (21) of described valve gap (12) is provided with the protruding circle (22) that stops valve rod to move down, and the lower end of described valve rod (21) is threaded with piston (6).

2, balanced type stop valve according to claim 1 is characterized in that described piston (6) lower end is connected with flap (3) by valve petal shelf (25).

3, balanced type stop valve according to claim 2 is characterized in that being provided with seal ring (26) between described piston (6) and the valve petal shelf (25).

4, balanced type stop valve according to claim 1 is characterized in that described valve gap (12) outside is fixed with the label that shows flap (3) keying valve seat (7).

5, balanced type stop valve according to claim 4, it is characterized in that described label comprises the indicator board (19) that is fixed on the valve gap (12) and is enclosed within travelling nut (17) on valve gap (12) outside valve rod (21), described travelling nut (17) radially is provided with the pointer (18) that cooperates with indicator board (19).

6, balanced type stop valve according to claim 1 is characterized in that described supporting base is threaded with valve gap (12).

7, balanced type stop valve according to claim 6 is characterized in that described supporting base comprises the Stuffing box (13) that is threaded with valve gap (12), is positioned at the filler (14) between Stuffing box (13) and the valve rod (21) and is placed in the gland nut (15) that compresses Stuffing box on the valve rod (21).