CN2307960Y

CN2307960Y - Three-eccentric butterfly valve

Info

Publication number: CN2307960Y
Application number: CN 97237428
Authority: CN
Inventors: 史利民; 肖隆明; 杨永莲
Original assignee: CHENGDU VALVE FACTORY
Current assignee: CHENGDU VALVE FACTORY
Priority date: 1997-07-28
Filing date: 1997-07-28
Publication date: 1999-02-17
Anticipated expiration: 2007-07-28

Abstract

The utility model relates to an eccentric butterfly valve, which mainly comprises a valve body. A valve rod is installed on a position which deviates from the centre line of the valve body in a distance. An elliptic cone shape butterfly plate which deviates from the axial lead of valve rod in a distance is installed on the valve rod. A sealing seat is arranged on the inner edge surface of the butterfly plate and the valve body. The butterfly plate which deviates from the cross section of the valve body in an angle is inclined in the valve body. The sealing seat is correspondingly inclined on the inner edge surface of the valve body. The utility model has the advantages of small open moment and reliable sealing. The utility model is especially suitable for middle and high temperature systems and middle and high pressure systems.

Description

Three eccentric butterfly valve

The utility model relates to a kind of eccentric-butterfly-valve.

Chinese patent CN2175859Y discloses a kind of " metallic sealing butterfly valve ", constitute by valve body, valve rod and butterfly plate, wherein, the valve rod shaft axis departs from distance of valve body center line and installs, the end section of butterfly plate is the elliptic cone that is obtained by the circular cone oblique section, depart from distance of valve rod shaft axis and be installed on the valve rod, and be positioned on the cross-section location of valve body.By handling valve rod butterfly plate is rotated, finish the unlatching of valve or close.The less than one of this butterfly valve is that its butterfly plate is positioned on the cross section of runner, and for guaranteeing the unlatching of butterfly plate, the sealing surface of the eccentric side of its valve rod parallels with the runner center line, and both its sealing surface was the linear sealing face of a tangent shape, and sealing is not high.In addition, the Flow area that is in the butterfly plate on the flow channel cross-section is for minimum, and its flow resistance coefficient is big, and required unlatching energy is big; The 3rd, can only take a lot of work by changing or the replacement sealing seat solve after the wearing and tearing of its sealing seat, time-consuming, increase user cost.

The purpose of this utility model is the above-mentioned deficiency that overcomes existing eccentric-butterfly-valve, and the another kind of three eccentric butterfly valve that moment is littler, sealability reliable, the wearing and tearing of sealing seat can be adjusted by the installation station of adjusting valve rod simply of opening is provided.

This technological scheme realizes the purpose of this utility model in the valve body by butterfly plate is inclined in.It is concrete constitute comprise valve body, depart from valve rod that distance of valve body center line installs, depart from distance of valve rod shaft axis be installed in the elliptic cone shape butterfly plate on the valve rod and be arranged on this butterfly plate and the valve body inner edge surface on sealing seat, it is tilting in valve body that described butterfly plate departs from angle of valve body cross section, and described sealing seat correspondence tiltedly is located on the inner edge surface of valve body.Under the drive of butterfly plate at valve rod when the valve rod shaft axis rotate in place, the sealing surface of tilting butterfly plate is face contact seal with the corresponding sealing seat that is arranged on the valve body inner edge surface, the load of its sealing is not only provided by the moment that applies, and also the static pressure moment that is produced by the pressure medium on the non-equilibrium end face that acts on butterfly plate provides.That is to say, owing to the area of the butterfly plate that is in the valve rod both sides is different, be consistent than the action direction of the static pressure moment on the large size and the steering direction that butterfly plate is closed, so this static pressure moment has played the effect of serving as airtight load.On the other hand, the circulation area of tilting butterfly plate is greater than the circulation area of the former butterfly plate of just putting, and it is littler that the corresponding ratio of its flow resistance coefficient is just being put, thereby unlatching moment is reduced; Because the sealing surface between butterfly plate and valve body is a tapered plane, therefore, behind its sealing surface wear, the limit stoper of can regulate butterfly valve is regulated the mounting point of valve rod and compensate toward the sealing seat direction.

The utility model has the advantages that:

1, on 360 ° of circumferential surfacies of butterfly plate, can guarantee that each point seals positive pressure uniformly, need not lean on the self-deformation of seal ring can obtain the sealing effect of zero seepage, thereby can adopt metal-seated, the heat resisting temperature of valve is improved greatly;

2, open that each point breaks away from sealing seat simultaneously on the moment butterfly plate circumference, no interplanar blocked portion, extruding and relative friction-produced between sealing surface have guaranteed the long-life and the operating flexibility of sealing pair, and frequently switching all has uniform sealing effect;

3, the compensation that can be undertaken by " gradual " of butterfly plate position of sealing wear increases working life;

4, unlatching moment is littler, and the sealability of valve is not acted upon by temperature changes.

5, enlarged Applicable scope, can be widely used in the medium and high temperature in the various industries such as heat supply, petrochemical industry, metallurgy, electronics, the middle and high pressing system.

Cheat out embodiment below in conjunction with accompanying drawing.

Fig. 1 structural representation of the present utility model.

The formation schematic representation of the eccentric butterfly plate of Fig. 2.

Fig. 3 butterfly plate opening state schematic representation.

As shown in Figure 1, the opening device (not looking out among the figure) of the valve body 1 of this three eccentric butterfly valve, valve rod 2 and actuate valve stem rotation all can be continued to use the structural type formation of existing eccentric-butterfly-valve.Butterfly plate 4 is a plate that becomes one jiao of α to downcut with the cock axle in taper cock (shown in Fig. 2 double dot dash line) 5, its cross section is an ellipse, periphery 6 is the conical surface, with the cross section of valve body at angle β be installed in the valve body, sealing seat 7 is also corresponding tilting on the inner edge surface of valve body 1.Fig. 3 has provided the schematic representation that butterfly plate 4 is the full open shape.

Claims

1, a kind of three eccentric butterfly valve, comprise valve body, depart from valve rod that one of valve body center line distance installs, depart from distance of valve rod shaft axis be installed in the elliptic cone shape butterfly plate on the valve rod and be arranged on this butterfly plate and the valve body inner edge surface on sealing seat, it is tilting in valve body to it is characterized in that described butterfly plate departs from angle of valve body cross section, and described sealing seat correspondence tiltedly is located on the inner edge surface of valve body.