CN2347019Y - Pressure sealed check throttle valve - Google Patents

Abstract

The utility model relates to a pressure sealed check throttle valve, comprising a valve casing (1), a valve cap (10), a valve rod (4) and a valve flap (2) arranged on one end of the valve rod. The utility model is characterized in that a stuffing box (5) is arranged between the valve rod and the valve cap, a self sealing ring (7) matched with the stuffing box through a conical sealing face (6) is arranged outside of the stuffing box (5), and the self sealing ring (7) is pressed by the valve cap (10); stuffing (9) is arranged in the stuffing box (5), and a pressing dummy club (3) is arranged on a threaded rod above the valve flap (2); after a valve is opened, a medium acts on the lower plane surface of the stuffing box and pushes the stuffing box upwards so as to enhance sealing pressing force; when the valve is opened to a maximum degree, the pressing dummy club (3) presses the stuffing box and pushes the stuffing box upwards so as to enhance pressing force; therefore, initial sealing pressure is small, service life is long, flanges and screw bolts arranged on upper part are left out, and the utility model has small volume and light weight.

Description

The wiper seal cut-off throttle valve

The utility model relates to valve.

Existing valve such as poppet valve, have a valve disc or a lobe that is contained on the valve rod, rotation valve rod makes flap be sitting on the valve seat or lifts off a seat and make valve airtight or open, all adopt Stuffing box and packing seal between valve rod and the valve casing, this sealing rely on fully Gland with filler (as asbestos graphite rope, rubber ring etc.) push down and seal, therefore the life-span weak point is big to the wearing and tearing of valve rod, needs frequent maintain and replace, particularly in high pressure valve, in let out that to leak outside be puzzlement people's a big problem, and Stuffing box and valve casing in conjunction with adopting flange, bolt arrangement, complex structure, volume is big and heavy.

The purpose of this utility model is to overcome above-mentioned shortcoming, and providing a kind of can be compressed sealing by the working medium pressure of valve, and volume is little, lightweight wiper seal cut-off throttle valve.

The purpose of this utility model realizes by following technological scheme, the wiper seal cut-off throttle valve has valve casing, runner and valve seat in the valve casing, be connected in valve gap on the valve casing with screw thread, the Stem Mut that valve gap top and valve gap are connected, the valve rod that is threaded with Stem Mut, the handle of valve rod one end and the flap that is positioned at valve casing of the valve rod the other end, it is characterized in that with said valve cover chamber Stuffing box being arranged outside the said valve rod, Stuffing box and said valve cover chamber have pressure sealing ring, valve gap is pressed Stuffing box by pressure sealing ring and is sitting on the valve casing, between Stuffing box and pressure sealing ring conical seal (contact) face is arranged, between Stuffing box and said valve rod filler is arranged, filler gland and hold-down grid are arranged at filler top, hold-down grid and valve cover chamber have hold-down bolt, compress boss on the valve rod above the flap.

Wiper seal cut-off throttle valve of the present utility model, when in the valve during no pressure medium, by valve gap to the initial pressure sealing of conical seal (contact) face and hold-down bolt to filler, and as pressure medium, then pressure medium acts on the Stuffing box lower surface Stuffing box is upwards pushed away, pressure sealing ring or filler further can be compressed, improved sealing, therefore initial sealing pressure does not need very greatly, has reduced the wearing and tearing of valve rod and filler, has improved the life-span of valve, and when valve leaves greatly, compress boss and be pressed on the Stuffing box lower end and Stuffing box is upwards pushed away, can improve sealing equally, this valve has saved the flange between existing valve packing case and valve casing, bolt, be threaded and use instead, make this valve mechanism compactness, volume is little, and is in light weight.

Below in conjunction with drawings and Examples wiper seal cut-off throttle valve of the present utility model is explained in detail.

Fig. 1 is the structural representation of the utility model wiper seal cut-off throttle valve.

As Fig. 1, this wiper seal cut-off throttle valve has valve casing 1, valve casing 1 can be an angie type, straight-through type or other form, runner and valve seat are arranged on the valve casing 1, can be sitting in the flap 2 on the valve seat, a valve gap 10 that links to each other with the charge end of valve casing 1 with screw thread, the supporting yoke that protrudes upward on the valve gap 10, be fixed with Stem Mut 13 in the supporting yoke, valve rod 4 is threaded with Stem Mut 13 and passes valve gap 10 and stretch in the valve casing, the end that valve rod stretches into valve casing links to each other with flap 2, valve rod then is connected with handwheel 14 at an end in the outside of Stem Mut, at valve gap 10 places, valve rod 4 outsides are with a Stuffing box 5, it is Spielpassung between valve rod and valve gap 10 and with it, Stuffing box 5 Wai Yuan lower ends have the sealing surface 6 of taper, pressure sealing ring 7 is positioned to be held under the outer and valve gap of Stuffing box and has a sealing taper hole that matches with said sealing surface 6, the screw thread that valve gap 10 is connected with valve casing 1 is tightened then valve gap and by pressure sealing ring 7 Stuffing box 5 is pressed and be sitting on the step of valve casing 1, and make pressure sealing ring 7 and 5 sealings of Stuffing box by sealing surface 6, the external diameter of pressure sealing ring 7 then and between the valve casing internal diameter seals, 4 of Stuffing box 5 and valve rods have filler 9, there is Packing seat 8 at the filler two ends, filler 9 is in operating temperature during less than 200 ℃, preferably adopt teflon 0 type seal ring, when operating temperature is 200-550 ℃, preferably adopt asbestos graphite to add the square section packing of Stainless Steel Wire, filler 9 tops are pressed with filler gland 11, filler gland top is pressed with hold-down grid 12, bolt 16 1 ends are connected on the valve gap 10, one end has nut 15 to be pressed on the hold-down grid and hold-down grid is pressed to filler 9, bolt 16 and the most handy bearing pin 17 hinges of being connected of valve gap, it on the hold-down grid screw that opening is arranged, then be convenient to the dismounting of hold-down grid, above the flap 2 and on the appropriate location of the valve rod 4 below the Stuffing box 5, has the boss of compressing 3, it can make valve rod that Stuffing box is upwarded pressure when valve open and increase in the Stuffing box, outer sealing force, the upper surface that compresses boss 3 can be the plane, but be preferably the conical surface, there is the taper hole that cooperates with it the Stuffing box lower end, makes the two have seal action.

Wiper seal cut-off throttle valve of the present utility model, because Stuffing box is valve gap and valve stem slides relatively, when pressure medium acts on the Stuffing box bottom, or valve rod opens and when Stuffing box upwards pushed away, and then Stuffing box can upwards be pressed and pressure sealing ring 7 or filler 9 compressed and produced the wiper seal effect.In not having during pressure (as valve closing time), because the sealing surface between Stuffing box and pressure sealing ring, when valve gap is pushed down Stuffing box, sealing surface has initial sealing pressure and can not leak, the effect of tapering simultaneously makes the pressure sealing ring external diameter rise to make greatly and seals between pressure sealing ring and valve casing endoporus, 9 of fillers are tightened degree and are regulated compaction degree by nut 15, work as opening of valves, high-pressure medium acts on the Stuffing box lower plane Stuffing box is upwards pushed away, pressure sealing ring or filler are compressed, play the wiper seal effect, improved sealability, when valve reaches maximum, compressing boss is pressed on below the Stuffing box, sealing mutually between boss and the conical surface, boss upwards pushes away Stuffing box simultaneously, pressure medium also upwards pushes away Stuffing box simultaneously, plays the wiper seal effect, and therefore initial sealing impacting force does not need very big, so can reduce the wearing and tearing between filler and valve rod, when relying on pressure medium or valve rod to open greatly Stuffing box is upwarded pressure, can when work, obtain good sealing, the therefore working life of having improved valve, simultaneously owing to change the flange of the Stuffing box part on existing valve top, structures such as screw are for being threaded, and this valve arrangement compact volume is little, and is in light weight.

Claims (3)

1, a kind of wiper seal cut-off throttle valve, has valve casing (1), runner and valve seat in the valve casing, be connected in valve gap (10) on the valve casing (1) with screw thread, the Stem Mut (13) that valve gap (10) top and valve gap are connected, the valve rod that is threaded with Stem Mut (4), the handwheel (14) of valve rod one end and the flap that is positioned at valve casing (2) of the valve rod the other end, it is characterized in that outside the said valve rod (4) and between said valve gap (10) Stuffing box (5) being arranged, between Stuffing box (5) and said valve gap (10) pressure sealing ring (7) is arranged, valve gap (10) is pressed Stuffing box (5) by pressure sealing ring (7) and is sitting on the valve casing (1), between Stuffing box (5) and pressure sealing ring (7) conical seal (contact) face (6) is arranged, between Stuffing box (5) and valve rod (4) filler (9) is arranged, filler gland (11) and hold-down grid (12) are arranged at filler top, hold-down grid and valve cover chamber have hold-down bolt, nut compresses boss (3) on the valve rod (4) of flap (2) top.

2, wiper seal cut-off throttle valve as claimed in claim 1 is characterized in that said filler (9) adds the square section packing of Stainless Steel Wire for the O type seal ring of teflon system or asbestos graphite.

3, wiper seal cut-off throttle valve as claimed in claim 1 or 2 is characterized in that the said upper surface that compresses boss (3) is the conical surface, in Stuffing box (5) lower end the taper hole that matches with this conical surface is arranged.