CN212718083U

CN212718083U - Ultra-low temperature plate valve

Info

Publication number: CN212718083U
Application number: CN202021406230.5U
Authority: CN
Inventors: 庄新; 梁月星; 陈洪坤
Original assignee: Cepai Group Co Ltd
Current assignee: Cepai Group Co Ltd
Priority date: 2020-07-16
Filing date: 2020-07-16
Publication date: 2021-03-16
Anticipated expiration: 2030-07-16

Abstract

The utility model discloses an ultra-low temperature plate valve, including last valve gap, valve body and lower valve gap, go up the valve gap with through bolt fixed connection between the valve body, down the valve gap with through bolt fixed connection between the valve body, still including first disk seat and the second disk seat that the symmetry set up, be equipped with the flow liquid chamber in the valve body, be located flow liquid chamber both sides, the symmetry is equipped with the disk seat mounting groove on the valve body, first disk seat with the second valve seat is installed respectively in the disk seat mounting groove on the valve body, first disk seat with between the valve body, the second disk seat with all be equipped with LIP SEAL sealing washer between the valve body, first disk seat with all be equipped with the flow liquid through-hole on the second valve seat axial direction, the valve plate with first disk seat the second valve seat is sliding connection respectively. The utility model discloses a institutional advancement can satisfy the application under the operating mode of ultra-low temperature, has good gas tightness and reliability.

Description

Ultra-low temperature plate valve

Technical Field

The utility model belongs to the technical field of the gate valve, in particular to ultra-low temperature plate valve.

Background

The design and manufacture of the low-temperature valve in China are late, the product quality and reliability are generally not high, and the difference between the low-temperature valve and the product quality and the reliability is large. On some ultralow temperature (-196 ℃) pipelines, most operation valves are imported valves, which will cause the increase of the operation cost of production enterprises and restrict the development of domestic low temperature valves.

The liquefied natural gas storage tank area largely uses ultralow temperature valves including ball valves, butterfly valves and flat gate valves. The flat valve has the advantages of reliable sealing, small opening torque, convenient operation and maintenance, long service life and the like. Therefore, the development of an ultra-low temperature and ultra-high pressure flat gate valve is the first choice for replacing an inlet valve, and is the key point of design, development and planning of a plurality of valve enterprises.

The low-temperature valve used on site at present mainly adopts a soft seal ball valve, and under the low-temperature working condition, the opening and closing torque is very large, the operation is laborious, and the number of switch turns is large; the sealing is not tight, the inner leakage is serious, the service life is short, and the service life of the product can not be better met, so that the problem existing in the prior art needs to be solved by improving the prior art.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art, the utility model aims to provide an ultra-low temperature plate valve solves the problem in the background art to realize that can use under the operating mode of ultra-low temperature, have good gas tightness and reliability.

The utility model discloses a realize through following technical scheme:

an ultralow-temperature flat gate valve comprises an upper valve cover, a valve body and a lower valve cover, wherein the upper valve cover is fixedly connected with the valve body through bolts, the lower valve cover is fixedly connected with the valve body through bolts, the ultralow-temperature flat gate valve further comprises a first valve seat and a second valve seat which are symmetrically arranged, a liquid flowing cavity is arranged in the valve body and is positioned on two sides of the liquid flowing cavity, valve seat mounting grooves are symmetrically formed in the valve body, the first valve seat and the second valve seat are respectively mounted in the valve seat mounting grooves in the valve body, LIP SEAL sealing rings are respectively arranged between the first valve seat and the valve body and between the second valve seat and the valve body, valve plate through holes are respectively formed in the first valve seat and the second valve seat in the radial direction, and a valve plate is respectively connected with the first valve seat and the second valve seat in a sliding mode through; and double sealing structures are arranged between the valve plate and the first valve seat and between the valve plate and the second valve seat, a liquid flow hole is formed in the valve plate, and when the valve is opened, the liquid flow hole, the valve seat through hole and the liquid flow cavity are communicated.

The utility model discloses a further improvement is, first disk seat with between the valve body the second disk seat with be equipped with respectively between the valve body and tight spring.

The utility model discloses a further improvement scheme is, double seal structure is including soft seal and hard seal.

The utility model discloses a further improvement is, the soft seal includes the disk seat sealing member, the disk seat sealing member is located respectively first disk seat with between the valve plate the second disk seat with between the valve plate, and the nestification is in first disk seat with on the second disk seat.

The utility model discloses a further improvement is, hard seal includes Co base hard alloy layer, Co base hard alloy layer piles up the welding respectively first disk seat with on the second disk seat, and is located the disk seat sealing member with between the valve plate.

The utility model discloses a further improvement is, still include the valve rod, the valve rod with can dismantle the connection through T type groove between the valve plate, the valve rod still with go up valve cap sliding connection.

The utility model discloses a further improvement is, go up the valve gap with be equipped with valve rod packing subassembly between the valve rod, valve rod packing subassembly nestification is in go up the inner wall of valve gap.

The utility model discloses a further improvement scheme is, valve rod packing subassembly is graphite packing subassembly.

Compared with the prior art, the utility model, following obvious advantage has:

1. the utility model provides an ultra-low temperature plate valve, first disk seat and second valve seat are installed respectively on the valve body in the disk seat mounting groove, between first disk seat and the valve body, are equipped with LIP SEAL sealing washer between second disk seat and the valve body respectively, and LIP SEAL sealing washer is a spring energy storage sealing washer. The sealing washer overcoat adopts the PTFE material, and inside spring material is the Elgiloy alloy, and elasticity is big, can compensate in the low temperature medium, outside nonmetal PTFE shrinkage deformation, and the spring can compensate, can satisfy the ultra-low temperature operating mode well and use.

2. The utility model provides an ultra-low temperature plate valve, between valve plate and the first disk seat, between valve plate and the second valve seat, all be equipped with double seal structure, this double seal structure includes soft seal and hard seal, during daily work, soft seal material plays the main seal effect, when the pipeline is undulant increases, the hard seal plays to support and the main seal effect, like this, can reduce the daily operating torque of valve, can adopt the hand wheel to easily open, and need not adopt the turbine box to carry out the deceleration and fall the power, the on-off time obtains greatly saving.

3. A Co-based hard alloy layer is adopted for hard sealing, the Co-based hard alloy layer is circumferentially overlaid on a first valve seat and a second valve seat, the material is STL6, the surface hardness is more than HRC37, the polishing treatment is carried out after the processing of a mirror grinding machine, the surface roughness reaches more than 0.1, the abrasion of a sealing surface caused by frequent opening of a valve under the low-temperature working condition is facilitated, and the sealing reliability is ensured.

4. In soft sealing, a valve seat sealing element is made of PCTFE material, the applicable temperature of the material is-196 to +125 ℃, and the strength, hardness and wear resistance of the material are hardly influenced in a low-temperature state, so that the material is an ideal low-temperature material. The valve seat is embedded in a sealing groove at the end part of the valve seat, and after being processed by a mirror surface grinder, the surface roughness reaches more than 0.1, and the friction coefficient is very low.

5. The utility model provides an ultra-low temperature plate valve, valve body adopt integrative whole forging structure, compact structure, and the valve outer leak source is few, uses safelyr, between first disk seat and the valve body, between second disk seat and the valve body, is equipped with respectively and tight spring to tight spring realizes the developments pretension to first disk seat and second disk seat.

Drawings

FIG. 1 is the utility model discloses an overall structure section view of ultra-low temperature plate valve

FIG. 2 is the utility model discloses a local structure enlarger of ultra-low temperature plate valve

In the figure, 1-lower valve cover, 2-gasket, 3-valve body, 4-valve plate, 5-LIP SEAL, 6-clamping spring, 7-second valve seat, 8-valve seat sealing element, 9-first valve seat, 10-valve rod, 11-upper valve cover, 12-valve rod packing component, 13-plane thrust bearing, 14-Co-based hard alloy layer.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

Example 1

As shown in fig. 1-2, the present embodiment provides an ultra-low temperature plate gate valve, which comprises an upper valve cover 11, a valve body 3, and a lower valve cover 1, wherein the upper valve cover 11 is fixedly connected with the valve body 3 through bolts, the lower valve cover 1 is fixedly connected with the valve body 3 through bolts, the ultra-low temperature plate gate valve further comprises a first valve seat 9 and a second valve seat 7 which are sequentially arranged from left to right, a fluid flow cavity is arranged in the valve body 3, the fluid flow cavity is located at two sides of the fluid flow cavity, valve seat mounting grooves are symmetrically arranged on the valve body 3, the first valve seat 9 and the second valve seat 7 are respectively mounted, an LIP SEAL sealing ring 5 is respectively arranged between the first valve seat 9 and the valve body 3 and between the second valve seat 7 and the valve body 3, valve seat through holes are respectively arranged in the axial direction of the first valve seat 9 and the second valve seat 7, a valve plate through cavity is formed between the first valve seat 9 and the second valve seat 7, and the valve plate 4 is respectively connected with the first valve seat 9 and the second valve seat 7 in a sliding manner; LIP SEAL sealing washer 5 is a spring energy storage sealing washer, and the sealing washer overcoat adopts the PTFE material, and inside spring material is the Elgiloy alloy, and elasticity is big, can compensate in the low temperature medium, outside nonmetal PTFE shrinkage deformation, and the spring can compensate, can satisfy the ultra-low temperature operating mode better and use.

And a double-sealing structure is respectively arranged between the valve plate 4 and the first valve seat 9 and between the valve plate 4 and the second valve seat 7, a liquid flow hole is arranged on the valve plate 4, and when the valve is opened, the liquid flow hole, the valve seat through hole and the liquid flow cavity are communicated.

And springs 6 are arranged between the first valve seat 9 and the valve body 4 and between the second valve seat 7 and the valve body 4 respectively. The valve body 3 adopts an integral forging structure, the structure is compact, the leakage points outside the valve are few, the use is safer, the first valve seat 9 and the valve body 4 and the second valve seat 7 and the valve body 4 are respectively provided with the tightening springs 6, and the tightening springs 6 realize the dynamic pre-tightening of the first valve seat 9 and the second valve seat 7.

This dual seal structure includes soft seal and hard seal, and during daily work, soft seal material plays the main seal effect, when the pipeline is undulant to be increased, and hard seal plays support and main seal effect, like this, can reduce the daily operating torque of valve, can adopt the hand wheel to easily open, and need not adopt the turbine case to carry out the speed reduction and fall the power, and the on-off time obtains greatly saving.

The soft seal comprises a valve seat sealing piece 8, wherein the valve seat sealing piece 8 is respectively nested on a first valve seat 9 and a second valve seat 7 and is distributed between the first valve seat 9 and the valve plate 3 and between the second valve seat 7 and the valve plate 3. The valve seat sealing element is made of PCTFE material, the applicable temperature of the material is-196 to +125 ℃, and the strength, hardness and wear resistance of the material are hardly influenced in a low-temperature state, so that the material is an ideal low-temperature material, is embedded in a sealing groove at the end part of a valve seat, and is processed by a mirror surface grinder, the surface roughness of the material reaches more than 0.1, and the friction coefficient is very low.

The hard seal comprises a Co-based hard alloy layer 14 (as a black solid part in fig. 2, the same below), the Co-based hard alloy layer 14 is respectively stacked and welded on the first valve seat 9 and the second valve seat 7 and is positioned between the valve seat seal 8 and the valve plate 4, the Co-based hard alloy layer 14 is circumferentially overlaid on the first valve seat 9 and the second valve seat 7, the material is STL6, the surface hardness is more than HRC37, and the surface roughness is more than 0.1 after being processed by a mirror grinding machine, so that the hard seal is beneficial to preventing the sealing surface from being scratched due to frequent opening of the valve under the low-temperature working condition, and the sealing reliability is ensured. In this embodiment, a Co-based hard alloy layer 14 is further deposited on the valve plate 4, and at this time, the hard seal means that the Co-based hard alloy layer 14 on the valve plate 4 is in contact with the Co-based hard alloy layer 14 on the first valve seat 9 and the Co-based hard alloy layer 14 on the second valve seat 7, so as to avoid abrasion between the valve plate 4 and the first valve seat 9 and between the valve plate 4 and the second valve seat 7, and the abrasion only occurs on the Co-based hard alloy layer 14. When the pressure is normal or lower, the soft seal is effective, and the Co-based hard alloy layer 14 is not in surface contact with the valve plate 4; when the pressure is high, the soft seal is compressed to generate large deformation, and the Co-based hard alloy layer 14 comes into contact, and a hard seal is formed.

Can dismantle through T type groove between valve rod 10 and the valve plate 4 and be connected, valve rod 10 and the 11 sliding connection of last valve gap, go up and be equipped with valve rod packing assembly between valve gap 11 and the valve rod 10, valve rod packing assembly 12 nests at the inner wall of last valve gap 11, this valve rod packing assembly 12 is graphite packing assembly, what adopt is the chinese utility model patent, the graphite packing assembly that the patent number is CN 209990994U belongs to prior art, this graphite packing assembly, sealing performance is good, the coefficient of friction is little, can switch more than 2000 times in succession, need not pretension packing clamp plate, valve rod 10 is located to seal still reliably.

The valve is a hard seal flat gate valve, and the design pressure is 1500 LB. The valve body adopts an integrated integral forging structure, the structure is compact, the leakage points outside the valve are few, and the use is safer. The upper valve cover 11 adopts an extended neck design (see figure 1), the height from the bottom of a valve rod filler hole to an inner cavity is increased, and the gap between the valve cover hole and the valve rod 10 is controlled to be not more than 1.5mm, so that a low-temperature medium in the inner cavity flows through the valve cover elongated hole to be in heat conduction with the outer surface of the upper valve cover 11, and when the medium flows to the valve rod filler, the temperature of the medium is reduced to about 0 ℃. The valve plate 4, the first valve seat and the second valve seat adopt floating sealing structures, the valve plate 4 and the valve rod 10 are connected by adopting a T-shaped groove, are suspended in the valve cavity and are in a relatively floating state; valve seat 4 adopts clearance fit with valve body 3, relies on and tight spring 6, tightly presses first valve seat 9 and second valve seat 7 to valve plate 4, and under the thrust effect of medium, first valve seat 9 and second valve seat 7 compress tightly valve plate 4 more and realize reliable high-pressure seal. The main SEAL of the valve seat adopts the design of an LIP SEAL SEAL ring 5, can resist the low temperature of-196 ℃, has very good ageing resistance and service life, and can improve the maintenance-free period by 1-2 times compared with the normal valve. The valve rod 10 adopts a patent low-leakage graphite packing group (patent number: CN 209990994U) for sealing, has good sealing performance and small friction coefficient, can be continuously opened and closed for more than 2000 times, does not need to pre-tighten a packing pressing plate, and is still reliable in sealing at the position of the valve rod 10. The upper part of the nut of the valve rod 10 is provided with a plane thrust bearing 13, so that the opening and closing torque of the valve 10 can be reduced, the valve is easier and more labor-saving to operate, when the hand wheel rotates forwards, the valve rod 10 drives the valve plate 4 to vertically ascend, at the moment, the liquid flow hole on the valve plate 4 is not communicated with the liquid flow cavity, and the valve is closed; when the hand wheel rotates reversely, the valve rod 10 drives the valve plate 4 to vertically descend, the liquid flowing hole in the valve plate 10 is communicated with the liquid flowing cavity, and the valve is opened.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration only, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides an ultra-low temperature plate valve, includes upper valve cover (11), valve body (3) and lower valve cover (1), upper valve cover (11) with through bolt fixed connection between valve body (3), lower valve cover (1) with through bolt fixed connection, its characterized in that between valve body (3): the valve body (3) is internally provided with a liquid flowing cavity and positioned on two sides of the liquid flowing cavity, valve seat mounting grooves are symmetrically formed in the valve body (3), the first valve seat (9) and the second valve seat (7) are respectively mounted in the valve seat mounting grooves in the valve body (3), LIP SEAL sealing rings (5) are respectively arranged between the first valve seat (9) and the valve body (3) and between the second valve seat (7) and the valve body (3), valve seat through holes are respectively formed in the axial directions of the first valve seat (9) and the second valve seat (7), and the valve plate (4) is respectively in sliding connection with the first valve seat (9) and the second valve seat (7);

the double-seal structure is characterized in that a double-seal structure is respectively arranged between the valve plate (4) and the first valve seat (9) and between the valve plate (4) and the second valve seat (7), a liquid flow hole is formed in the valve plate (4), and when the valve is opened, the liquid flow hole, the valve seat through hole and the liquid flow cavity are communicated with one another.

2. An ultra-low temperature plate gate valve as claimed in claim 1, wherein: and tightening springs are respectively arranged between the first valve seat (9) and the valve body (3) and between the second valve seat (7) and the valve body (3).

3. An ultra-low temperature plate gate valve as claimed in claim 1, wherein: the dual seal structure includes a soft seal and a hard seal.

4. An ultra-low temperature plate gate valve as claimed in claim 3, wherein: the soft seal comprises a valve seat sealing piece (8), wherein the valve seat sealing piece (8) is respectively positioned between the first valve seat (9) and the valve plate (4) and between the second valve seat (7) and the valve plate (4), and is embedded on the first valve seat (9) and the second valve seat (7).

5. An ultra-low temperature plate gate valve as claimed in claim 4, wherein: the hard seal comprises a Co-based hard alloy layer, and the Co-based hard alloy layer is respectively welded on the first valve seat (9) and the second valve seat (7) in a stacking mode and is positioned between the valve seat seal (8) and the valve plate (4).

6. An ultra-low temperature plate gate valve as claimed in claim 1, wherein: still include the valve rod, valve rod (10) with can dismantle the connection through T type groove between valve plate (4), valve rod (10) still with go up valve gap (11) sliding connection.

7. An ultra-low temperature plate gate valve as claimed in claim 6, wherein: a valve rod packing component (12) is arranged between the upper valve cover (11) and the valve rod (10), and the valve rod packing component (12) is nested on the inner wall of the upper valve cover (11).

8. An ultra-low temperature plate gate valve as claimed in claim 7, wherein: the valve stem packing assembly (12) is a graphite packing assembly.