CN201330857Y

CN201330857Y - Triple-eccentric bidirectional metal seal butterfly valve

Info

Publication number: CN201330857Y
Application number: CNU2008201243123U
Authority: CN
Inventors: 张清双; 王楠
Original assignee: BEIJING VALVE GENERAL FACTORY GROUP Co Ltd
Current assignee: BEIJING VALVE GENERAL FACTORY GROUP Co Ltd
Priority date: 2008-12-05
Filing date: 2008-12-05
Publication date: 2009-10-21
Anticipated expiration: 2018-12-05

Abstract

A triple-eccentric bidirectional metal seal butterfly valve belongs to the technical field of valves, which solves the problem that a metal seal butterfly valve with a triple-eccentric structure can not realize bidirectional seal. A butterfly plate (1) adopts a truss structure and has the characteristics of good rigidity and small deflection; a valve rod (2) adopts a through shaft; an eccentric shaft sleeve (3) is adopted between the valve rod (2) and the butterfly plate (1) so as to assemble the valve rod (2) and the butterfly plate (1) with no clearance; besides, a wedge pin (5) is used for positioning and fixation; and the butterfly plate has good rigidity and small deflection, thereby avoiding seal disengagement caused by the clearance between the butterfly plate and the valve rod during reversed pressure bearing, realizing bidirectional seal of a triple-eccentric metal seal butterfly valve, and being capable of bearing pressure in positive direction and reverse direction; moreover, internal leakage does not exist either in positive pressure bearing or in reverse pressure bearing.

Description

The three eccentric two-way metal hard-sealing butterfly valve

Technical field

The utility model belongs to valve technology field, relates to the three eccentric two-way metal hard-sealing butterfly valve.

Background technique

Adopt the metal hard-sealing butterfly valve of three eccentric structures at present, because valve rod adopts two-part, after valve rod and the butterfly plate assembling is Spielpassung, and butterfly plate adopts the arcuate structure that caves in, and makes the amount of deformation of butterfly plate very big, cause the three eccentric metal hard sealed butterfly damper can only one-way sealing, promptly can only the forward pressure-bearing, can not reverse pressure-bearing, during reverse pressure-bearing, flowing medium Yi Yinnei leaks and blows back into the pump housing, thereby makes its application receive limitation greatly.

Summary of the invention

The technical problem that solves:

By changing the structure of three eccentric metal hard sealed butterfly damper, overcome the deficiencies in the prior art, make the three eccentric metal hard sealed butterfly damper can two way sealed, can positive and negative bidirectional bearing, during pressure-bearing, interior leakage does not take place all no matter forward or backwards.

The technological scheme that adopts:

The three eccentric two-way metal hard-sealing butterfly valve, have valve body, be positioned at valve seat on the valve body, by valve rod be contained in valve body butterfly plate, be contained in seal ring, bottom sealing plate and stuffing box on the butterfly plate, it is characterized in that: butterfly plate adopts truss structure, valve rod adopts axis, use adjustable excentric sleeve between valve rod and the butterfly plate, be linked and packed together with the zero clearance, and the taper pin positioning and fixing of crossing valve plate, excentric sleeve and valve rod is arranged.

Beneficial effect:

Butterfly plate adopts truss structure, good rigidly, amount of deformation is little, and valve rod adopts the axis structure, makes it have good rigidity when reverse pressure-bearing, favourable sealing, use adjustable excentric sleeve between valve rod and the butterfly plate, be linked and packed together, and the taper pin positioning and fixing is arranged with the zero clearance, in the time of avoiding reverse pressure-bearing, the sealing that causes because of the gap between butterfly plate and the valve rod breaks away from; Can make the metal hard-sealing butterfly valve of three eccentric structures realize two way sealed, can positive and negative bidirectional bearing, just or interior leakage all do not take place during reverse pressure-bearing.

Description of drawings

Fig. 1, main assembly structural representation;

Fig. 2 is the structure of excentric sleeve 3, and (a) plan view (b) is pressed the A shown in (a) to view;

Fig. 3 is the butterfly plate of truss structure, (c) presses B shown in Figure 1 to partial view, (d) by A-A partial cutaway figure shown in Figure 1;

Embodiment

Further explanation in detail in conjunction with the accompanying drawings;

Among the figure: 12-valve body, 13-valve seat, 14-seal ring, 10-stuffing box, 11-bottom sealing plate;

As shown in Figure 1, 2, one end band is regulated an excentric sleeve 3 of 4 packs in the valve rod hole 9 of butterfly plate 1, again valve rod 2 is packed in the excentric sleeve 3, pull and regulate 4, after being linked and packed with the zero clearance between regulating valve stem 2 and the butterfly plate 1, join brill with special device again, with taper pin 5 positioning and fixing of crossing butterfly plate 1, excentric sleeve 3 and valve rod 2; The quantity of taper pin 5 is generally two on top, one of bottom; When the diameter of valve rod 2 was Φ 90-110mm, eccentricity a was 0.06-0.08mm, and regulating 4 is tetrahedron, hexahedron or octahedral build.

Shown in Fig. 1,3, the truss structure of the butterfly plate 1 that integral body processes is as follows, have forward bearing plate 6 and reverse pressure-bearing plate 7, two bearing plates are by the position at valve rod hole 9 places, and be connected to one to the support beam 8 of the radial distribution of inner side surface of forward bearing plate 6 by the inner side surface central position of reverse pressure-bearing plate 7, perhaps support beam 8 is perpendicular between two bearing plates, and regular distribution two bearing plates are connected as one.

Claims

1, three eccentric two-way metal hard-sealing butterfly valve, have valve body, be positioned at valve seat on the valve body, by valve rod be contained in valve body butterfly plate, be contained in seal ring, bottom sealing plate and stuffing box on the butterfly plate, it is characterized in that: butterfly plate adopts truss structure, valve rod adopts axis, use adjustable excentric sleeve between valve rod and the butterfly plate, be linked and packed together with the zero clearance, and the taper pin positioning and fixing of crossing valve plate, excentric sleeve and valve rod is arranged.

2, three eccentric two-way metal hard-sealing butterfly valve according to claim 1, it is characterized in that: the truss structure of the butterfly plate that integral body processes (1) is as follows, have forward bearing plate (6) and reverse pressure-bearing plate (7), two bearing plates are by the position at valve rod hole (9) place, and be connected to one to the support beam (8) of the radial distribution of inner side surface of forward bearing plate (6) by the inner side surface central position of reverse pressure-bearing plate (7), perhaps support beam (8) is perpendicular between two bearing plates, and two bearing plates are connected as one.

3, three eccentric two-way metal hard-sealing butterfly valve according to claim 1 and 2 is characterized in that: an end of excentric sleeve (3) has regulates head (4).