CN2259530Y

CN2259530Y - Double-eccentric insulation butterfly valve

Info

Publication number: CN2259530Y
Application number: CN 96208749
Authority: CN
Inventors: 刘昌岭
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-04-20
Filing date: 1996-04-20
Publication date: 1997-08-13
Anticipated expiration: 2006-04-20

Abstract

The utility model relates to a double eccentric insulation butterfly valve belonging to the class of butterfly valves. The utility model is composed of a valve body, a valve base, a valve rod and a butterfly plate and is characterized in that a heat preservation chamber is arranged in the valve body, the section of the valve base presents a U-shaped circular ring, and the end of the valve rod is provided with a friction pad. The valve has flexible and quick start and stop, reliable seal, long service life, small fluid resistance and small operating torque. The double eccentric insulation butterfly valve can be used to cut or regulate the flow quantity of medium without hard particles, such as water, air, oil, inorganic acid, alkali, salt, alcohol, etc. for the departments of organic chemical industry, inorganic chemical industry, foodstuff, medicine, etc. The utility model can keep warm for the controlled medium and can work for a long time under 200 DEG C. The double eccentric insulation butterfly valve can serve as a special valve for organic acid, such as benzene, maleic anhydride, etc.

Description

Two eccentric insulation butterfly valves

Two eccentric insulation butterfly valves belong to the butterfly valve class in the valve products.

That the butterfly valve that prior art provided has is simple in structure, volume is little, it is little to take up room during connecting tube, installs, easy to operate, opens and closes advantages such as rapid flexibly.But still have following deficiency: 1. pair controlled medium can not be carried out insulation, and valve body material is generally foundry goods such as grey cast iron, magnesium iron, cast steel, and the annular heat tracing that existing foundry engieering can't cast out the hollow sealing is subjected to plenum chamber; 2. adopting the F4 plastic seat, is the wafer type butterfly valve of forming with the integrated type valve seat of two end flange, is subjected to the restriction of valve seat formation technique, and this type of butterfly valve maximum diameter is 500mm at present; 3. only the butterfly valve of valve seat is made by the F4 plastics in the sealing surface part, because the F4 plastics do not have elasticity substantially, so latus rectum is greater than the valve of 100mm, and sealing reliability is still unresolved; 4. for the butterfly valve of serviceability temperature, do not protect the heat-resisting measure of drive unit greater than 180 ℃.

The object of the present invention is to provide a kind of existing butterfly valve advantage that still possesses, overcome the two eccentric insulation butterfly valve of above-mentioned deficiency.

Technical characterstic of the present invention is: valve body 6 is the two eccentric structures with identical two throw of eccentric A, H with butterfly plate 10, ring heating, moist closet 30 are arranged in the valve body, valve seat 14 is integrated type annulus of the approximate U-shaped in a F4 plastics cross section, full elasticity reinforcement pad 15 in the chamber, there is round pie friction pad 3 valve rod 11 lower end surfaces, the middle flange 24 and the joint chair 22 of valve body 6 accompany thermal insulating pad 18, connect drive unit 23.

Embodiment of the present invention are 1. pairs of eccentric insulation butterfly valve structure schematic representation in conjunction with the accompanying drawings, and Fig. 2 is valve seat and the butterfly plate contacting point schematic representation of Fig. 1, is described further.This pair of eccentric insulation butterfly valve structure is shown in Fig. 1 .2., it is by two discoidal end flange 26 of cylinder 27 welding, cylinder and end flange also can be integrally casting and shape, in the welding of cylinder split diameter place, following pipe shape bearing supporting 25,29, support flange 24 in the welding of 25 upper ends, welding heat insulation wall 7 constitutes the withstand voltage air chamber 30 of ring heat tracing with cylinder 27 peripheries between two end flange 26, the steam that air chamber is communicated with flanged dish advances,

outer pipe

17,31 constitute the valve body 6 of moist closet, cylinder 27 endoporus are established valve seat supporting ring 28, in order to supporting valve seat and location, round ring seat 14, its internal diameter is the inclined-plane and the edge radius R3 at α angle, the sealing surface 32 that R4 forms, its sectional shape is similar to U-shaped, external diameter and cylinder Spielpassung, full elasticity reinforcement pad 15 is an interference fit with cylinder in the U-shaped chamber, 28 of valve seat 14 and supporting rings clamp spacer 13, in order to adjust the size of valve base sealing decrement, valve seat spacer 8, pressure ring 9 and bolt are pressed on end flange 26 sides, and make it produce radial deformation, the valve rod hole center line O of valve seat split and valve body ₂Offset distance is H, butterfly plate 10 is in the form of annular discs, its periphery has α angle inclined-plane and edge radius R1, the R2 identical with valve seat 14 sealing surfaces 32 to be formed, but diameter dimension is greater than a compression of valve seat respective diameters size increment Delta D, and the radial centre lines of butterfly plate is to pass through O ₁Straight line, O ₂The rotating center that is butterfly plate is the valve rod center, O ₁O ₂Distance is A, valve rod 11 insertion upper bearing (metal) supportings 25 install butterfly plate 10 and link together and transmitting torque by taper pin 12, valve rod lower end and lower bearing support and load bearing housing 5 in 29 holes, seal ring 4, there is round pie friction pad 3 the valve rod lower end surface, with spacer 1, bottom 2 bolton constitute the adjustable sealing configuration in valve rod lower end, valve rod 11 tops and upper bearing (metal) support and load onto bearing housing 16 in 25 holes, Packing seat 19, seal ring 20, with Gland 21 bolton, constitute the adjustable sealing configuration in valve rod top, add thermal insulating pad 18 above the middle flange 24, by dress heat radiation joint chair 22, the back connects drive unit 23, valve rod upper end key connecting drive unit, and transmitting torque is formed.Valve body 6, heat insulation wall 7, import and

export pipe

17,31 and each flange can be selected low carbon steel, Corrosion Resisting Steel for use, butterfly plate 10 can be selected magnesium iron, carbon steel, Corrosion Resisting Steel, Cuprum alloy for use, valve rod 11 is selected Corrosion Resisting Steels such as 2Cr13 for use, pressure ring 9 choose shuttles iron, carbon steel, Corrosion Resisting Steel, valve seat 14 selects the F4 plastics, reinforcement pad 15 selects silicone rubber, and each seal ring can be selected F4 plastics or silicone rubber for use.α gets at the angle 10～18 °.

The use and the adjustment of this pair of eccentric insulation butterfly valve:

Start drive unit 23, valve rod 11 drives butterfly plates 10 and rotates arbitrarily angled from 0 ° to 90 °, and G is a MEDIA FLOW to, butterfly plate rotation angle size, can the control media flow from maximum to zero.Heating steam enters annular heat tracing air chamber 30 by inlet tube 17, and it is temperature required that valve body 6 is remained on, and steam is discharged from outer pipe 31, and the control steam flow just can make butterfly valve keep setting temperature.The thickness of increase and decrease

spacer

8,13 can be adjusted the pressure that gives that pressure ring 9 puts on U-shaped valve seat 14, and elasticity reinforcement pad 15 is harmomegathus thereupon also, makes the U-shaped valve seat produce micro-deformation, keeps and the excellent sealing performance of butterfly plate 10.The thickness of attenuate spacer 1 can axially be adjusted valve rod 11 through the long-term wearing and tearing of using follower head, makes the centering position of butterfly plate recovery and valve seat.

The advantage of this pair of eccentric insulation butterfly valve:

1. simple in structure, volume is little, in light weight, open and close rapidly, fluid resistance is little, operational torque is little, can mate manual, pneumatic, electronic, the drive unit that surges, but field control, also can be at a distance or centralized control;

2. valve body, butterfly plate adopt two eccentric structures, and full silicone rubber reinforcement pad and end force are adjusted structure in its U-shaped valve seat, make this valve have that sealing is reliable, surface friction drag is little, the characteristic that the life-span is long;

3. use in case lose due sealing because of long-term, the U-shaped valve seat 14 that need more renew only, elasticity reinforcement pad 15 and

spacer

8,13 can return to the performance of new valve;

4. because being set, friction pad 3 is convenient to the valve rod axially locating, and can bear the axial force that valve rod, butterfly plate produce, and in use particularly important to large-diameter butterfly valve, effectively delay sealing surface 32 mills partially, guarantee reliable sealing performance, improve two times or more than existing similar butterfly valve working life;

5. this butterfly valve is provided with heat tracing chamber 30, and controlled medium is carried out insulation, and thermal insulating pad 18 joint chairs 22 are in order to heat insulation, heat radiation, and the protection drive unit can be adapted to higher temperature, can be 200 ℃ of normal phase work;

6. select for use multiple corrosion resistant material to make, can be widely used in than strong corrosive media and carry, can be used as organic acid special valves such as phthalic anhydride, cis-butenedioic anhydride.

This pair of eccentric insulation butterfly valve Specifications:

Inside nominal diameter (mm) DN 40～1000

Nominal pressure PN (Mpa) 1.0

Casing rigidity (Mpa) 1.5PN

Leakage test (Mpa) 1.1PN

Heat insulation work pressure (Mpa) 0.8

Applicable temperature (℃)-30～+ 200

Applicable media: organic acids such as gas phase phthalic anhydride, cis-butenedioic anhydride, phthalic acid, water, air, steam, oil product, food, medicine, inorganic acid, alkali, salt, ammonia, alcohol etc.

This pair of eccentric insulation butterfly valve can extensively be adapted to departments such as organic chemical industry, inorganic chemical industry, food, medicine, oil field, metallurgy, mine, electric power, and the medium that does not contain hard particles with gas (vapour) liquid phase of steam insulation ends or regulates flow.

Embodiment: model LEBD941F4-10C LEBD941F4-10P LEBD941F4-10P inside nominal diameter DN, (mm) 100 200 400 nominal pressure PN, (Mpa) 1.0 1.0 1.0 moist closet pressure, (Mpa) 0.8 0.8 0.8 throw of eccentric A, (mm) 333

H (mm) 23 31 46 sealing surface of seat angle [alpha] (degree) 15 18 15

Claims

1. two eccentric insulation butterfly valves, it is made up of valve body 6, valve rod 11, friction pad 3, butterfly plate 10, valve seat 14, pressure ring 9 and drive unit 23, it is characterized in that, and valve seat 14 is integrated type annulus of the approximate U-shaped in cross section.

2. by the described two eccentric insulation butterfly valves of claim 1, it is characterized in that in the said valve body 6 ring moist closet 30 being arranged.

3. by the described two eccentric insulation butterfly valves of claim 1, it is characterized in that full elasticity reinforcement pad 15 in the said valve seat 14.

4. by the described two eccentric insulation butterfly valves of claim 1, it is characterized in that there is round pie friction pad 3 said valve rod 11 lower end surfaces.

5. by the described two eccentric insulation butterfly valves of claim 1, it is characterized in that the middle flange 24 and the joint chair 22 of said valve body 6 accompany thermal insulating pad 18, connect drive unit 23.