CN212297796U - Balance buffer cavity for resetting safety valve with pressure grade of more than 35Mpa - Google Patents

Abstract

The utility model provides a balanced cushion chamber that is used for reset relief valve more than pressure level 35Mpa belongs to valve technical field. The balance buffer cavity comprises a piston and a closed valve cavity; the piston comprises a valve stem and a valve head; the closed valve cavity is formed by enclosing the upper surface of the valve head and a sealing retainer ring together; the sealing retainer ring is sealed in the inner cavity of the three-way valve body of the reset safety valve; the upper surface of the valve head is provided with at least one through hole. The utility model provides a balanced cushion chamber can make the pressure rating of resetting the relief valve improve 56-70 Mpa.

Description

Balance buffer cavity for resetting safety valve with pressure grade of more than 35Mpa

Technical Field

The utility model belongs to the technical field of the valve, especially, relate to a balanced cushion chamber that is used for the relief valve of resetting more than pressure level 35 Mpa.

Background

Quick opening reset relief valves are commonly used in systems that encounter acute or transient pressure spikes that exceed system operating or design limits. Depending on the application, such valves may experience overpressure only a limited number of times, or may recur. When an overpressure condition is encountered, a reset relief valve is required to open quickly to prevent system failure. In addition, as the system operating pressure increases, the pressure on the valve member increases, which may result in loss of seal integrity and compromise valve function.

The utility model patent with patent number ZL201610828401 discloses a spring reset relief valve, uses reset spring to realize that the valve safety opens the function in this patent. The patent well solves the problem of resetting the safety valve when the fluid pressure is below 35 Mpa. However, for high pressure systems exceeding 35Mpa, this single piston structure can result in accidental opening of the valve, affecting the proper functioning of the valve or causing malfunction, thereby compromising the integrity and safety of the system.

The hydraulic valve piston or valve member that is subjected to system pressure will only be subjected to the above-mentioned rapid increase or decrease in force during pressure relief caused by overpressure. However, it is important that the reset relief valve not only function properly during venting, but also not leak during normal system operation. Typical reset relief valves install seals made of elastomeric material at the interface between the valve components to prevent fluid leakage. Loss of valve integrity due to seal rupture or other failure can compromise the integrity and safety of the system.

As shown in the utility model with the patent number ZL201610828401, the leakage of liquid in the valve cavity is reduced. The patent uses a rubber damping sleeve for damping as the piston approaches its travel limit, attenuating the initial rapid rate of movement of the vent opening member/piston while minimizing the rebound forces in the piston movement.

Additionally, utility model patent No. ZL201610828401 utilizes threads to rotate the flange piston into position to engage the seal (note that the installer can remove the nut from the valve body and expose the valve member seal). If the engagement surface of the flange piston is damaged or does not meet the specifications required to mate with the sealing surface, a seal failure may occur and the valve member may be damaged. It is also noted that the torque applied by the installer may over compress and damage the seal, also leading to failure.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a balanced cushion chamber that is used for the relief valve of resetting more than pressure level 35Mpa can work under high-pressure environment, and is sealed better, and the life-span is longer, and it is more convenient to maintain, but the wide application is in the high-pressure system who is higher than 35Mpa for promote the security performance, maintenance system overall stability.

In order to realize the purpose of the utility model, the utility model provides a following technical scheme:

a balance buffer cavity for a reset safety valve with the pressure grade of more than 35Mpa comprises a piston and a closed valve cavity; the piston comprises a valve stem and a valve head; the closed valve cavity is formed by enclosing the upper surface of the valve head and a sealing retainer ring together; the sealing retainer ring is sealed in the inner cavity of the three-way valve body of the reset safety valve; the upper surface of the valve head is provided with at least one through hole.

Preferably, a first boss is arranged at the top of the sealing retainer ring; the lower surface of the valve cover of the reset safety valve is provided with a first counter bore matched with the first boss; the first boss is connected with the first counter bore in a sealing mode.

Preferably, the outer surface of the sealing retainer ring is provided with a second boss; a second counter bore matched with the second boss is arranged in the inner cavity of the three-way valve body of the reset safety valve; the second boss is connected with the second counter bore in a sealing mode.

Preferably, the balance buffer chamber is used for a reset safety valve with the pressure grade of 56-70 Mpa.

Compared with the prior art, the utility model, following beneficial effect has:

1. the utility model discloses one set of piston balance cushion chamber of built-in the valve body and sealing ring structure thereof makes high-pressure fluid seal in the airtight intracavity that special high strength material was made to realized, only increased the withstand voltage level of valve under 25%'s the condition at the whole quality of valve and improved 2 times. Under the condition of ensuring safety, the maximum safety pressure grade of the reset safety valve is increased to 70Mpa (10000 psi). But the valve housing is not subjected to high pressures. The valve member moves into engagement with the seal to close the valve fluid passage and moves out of engagement with the seal to open the valve fluid passage. The sealing retainer ring is fixed in the three-way valve body through the valve cover, sufficient power is provided for sealing, the reset safety valve can work under a high-pressure environment, sealing is better, the service life is longer, and maintenance is more convenient.

2. Through the piston balance cavity, the surface of a valve rod bushing or other parts of a valve cover is not required to be used for limiting, the integral pressure resistance value of the valve is improved by 1-1.5 times, and the fluid leakage at the part interface is minimized; improving the sealing function, durability, and maintainability of the valve, minimizing fluid leakage from the pressurized chamber; the reset safety valve can bear normal system working pressure through the piston balance cavity: (56-70MPa) 8000-.

Drawings

Fig. 1 is a schematic structural view of the safety valve installed in the reset position of the present invention;

FIG. 2 is an enlarged view of the sealing connection between the boss and the concave hole of the present invention;

FIG. 3 is a diagram illustrating the open state of the piston under the action of fluid pressure;

reference numerals: 1. the valve comprises a valve cap, a valve cover, a first fastener, a valve cover through hole, a valve body, a valve cover, a valve body, a valve cover, a.

The specific implementation mode is as follows:

the following description will be made in detail with reference to the accompanying drawings, which illustrate the present invention in a balanced buffer chamber for a reset safety valve with a pressure level above 35 Mpa.

As shown in fig. 1, a balance buffer chamber for a reset safety valve with a pressure grade above 35Mpa comprises a piston 5 and a closed valve chamber 6; the piston 5 comprises a valve stem 51 and a valve head 52; the closed valve cavity 6 is formed by the upper surface of the valve head 52 and a sealing retainer ring 7 which are enclosed together; the sealing retainer ring 7 is sealed in the inner cavity of the three-way valve body 3 of the reset safety valve; the valve head 52 has at least one through hole 53 in its upper surface.

As shown in fig. 2, in the present invention, a first boss 71 is disposed at the top of the sealing retainer 7; the lower surface of the valve cover of the reset safety valve is provided with a first counter bore matched with the first boss 71; the first boss 71 is in sealing connection with the first counterbore.

As shown in the figures, in the present invention, the outer surface of the sealing retainer 7 is provided with a second boss 72; the inner cavity of the three-way valve body 3 of the reset safety valve is provided with a second counter bore matched with the second boss 72; the second boss 72 is in sealing connection with the second counterbore.

In the utility model discloses in, balanced cushion chamber is used for the pressure rating to be 56-70Mpa reset relief valve.

For the detailed description the utility model provides a pair of a structure and theory of operation that is used for the balanced cushion chamber of the relief valve that resets of pressure level more than 35Mpa, now combine the attached drawing to do detailed explanation to balanced cushion chamber and reset the position relation of connection and the theory of operation between the relief valve.

As shown in fig. 1, the reset safety valve comprises a base 4 fixed on a three-way valve body 3 by bolts or studs or other means, a piston 5 positioned in the three-way valve body 3, a bonnet 2 fixed on the three-way valve body 3 by bolts or studs or other means, and a bonnet 1 fixed on the bonnet 2 by bolts or studs or other means. The bonnet 1 is connected with the first thread groove 34 in a threaded mode through the bonnet through hole 22 through bolts or studs and other fastener connection modes.

In the present invention, the bonnet 2 connected to the three-way valve body 3 by the fastener receives the upward force generated by the fluid pressure in the second flow passage 31 and the sealed valve chamber 6, instead of the bonnet 1 receiving the pressure of the fluid. Thus, the valve closure 2 may vary in size and accessory configuration depending on the mechanical specifications and design requirements. The sealing valve cavity 6 is formed by the lower surface of the valve cover, the sealing retainer 7 and the upper surface of the piston valve head 52 which are enclosed together. The sealing retainer ring 7 is sealed with the inner cavity of the three-way valve body 3.

The utility model discloses in, valve gap 2 is fixed on tee bend valve body 3 by 8 bolts. The other fastener design is that a stud is screwed into the three-way valve body 3, and only a nut needs to be disassembled when the three-way valve body is disassembled. Furthermore, the utility model discloses the use of well valve gap 2 makes can be close the sealed that is located three-way valve body 3 better. Another advantage of the present invention is that the bonnet 1 assembly is connected to the bonnet 2 instead of being connected to the three-way valve body 3, so that the pressure generated by the fluid acts on the bonnet 2 instead of on the bonnet 1, ensuring the safety of the bonnet 1 assembly.

In the present invention, the base 4 has a first flow passage 41, a first flow passage inlet 42 for receiving a fluid, a first flow passage outlet 43 connected to the three-way valve body 3, and a flange 47. The upper surface of the flange 47 is connected to the lower surface of the three-way valve body 3. One or more base through holes 46 extend through the flange 47 at right angles to the upper surface of the flange 47 for the attachment of bolts, studs or other fasteners. The bolts pass through the base through holes 46 and connect to the second threaded recesses 35 on the three-way valve body 3 so that the base 4 is secured to the three-way valve body 3 to seal the flange seal against the upper surface of the flange 47 and the lower surface of the three-way valve body 3.

In the present invention, the three-way valve body 3 has a second flow passage 31, and the lower portion of the second flow passage 31 has a third counter bore which is matched with the first flow passage outlet 43, the discharge end 32 and the discharge port 33 of the base 4. A third boss 44 is designed at the first flow passage outlet 43 of the base 4, and the third boss 44 is in sealing connection with a third counter bore so as to tightly engage the outer side of the valve head 52 of the piston 5. The piston 5 in the three-way valve body 3 is movable between two positions, as shown in fig. 1 and 3, the first position being a valve-closed position, i.e. the position of the valve head 52 of the piston 5 in fig. 1, the valve head 52 cooperating with the third boss 44 and the third counter bore and being in tight engagement with the seat 4 for closing the fluid passage. The second position is an open position as shown in fig. 3, the piston 5 is disengaged from the base 4, and the second flow path 31 is opened. The use of a matrix 4 with a zig-zag pattern may reduce or eliminate the possibility of damaging the seals and valve components during installation.

In the present invention, the piston 5 passing through the three-way valve body 3 includes a valve head 52, a valve rod 51 protruding from the valve head 52, an upper surface formed by a difference between an outer diameter of the valve rod 51 and an outer diameter of the valve head 52, and a lower surface facing the first flow passage 41. The valve stem 51 extends from the valve head 52 and is reversibly attached to the bonnet 1 by pins or other fasteners through the sealing collar 7 and the bonnet 2. The upper surface of the valve head 52 is the bottom end of the closed valve chamber 6 and is further defined by the inner wall of the sealing collar 7. One or more through holes 53 are provided through the valve head 52 to allow fluid to pass through the first flow passage 41 into the closed valve chamber 6 to provide a restricted flow of fluid at fluid pressure. The importance of this confined fluid is readily apparent. When the pressure in the first flow passage 41 exceeds a set pressure relief value, the piston 5 moves to the valve-open position, as shown in fig. 3, and fluid flows from the first flow passage 41 in the base 4 into the second flow passage 31 in the three-way valve body 3 through the discharge end 32 to the discharge port 33. When the piston 5 is moved by the release of the valve cap 1, the presence of the restricted fluid in the closed valve chamber 6 limits the speed of movement of the piston 5, since this restricted fluid must flow out through the through hole 53 under the pressure of the first flow passage 41 to allow the piston 5 to occupy the closed valve chamber 6 and open the second flow passage 31, thereby absorbing and reducing the acceleration and deceleration forces encountered by the piston 5 when releasing the pressure.

As shown in fig. 2, in the present invention, the sealing retainer 7 is detachable, the boss on the outer surface thereof is engaged with the counter bore of the inner cavity side wall of the three-way valve body 3, and the first boss 71 on the upper surface of the sealing retainer 7 is combined with the first counter bore of the bonnet 2. The end of the sealing retainer ring 7 is designed with a second boss 72 to seal with a second counter bore of the three-way valve body 3.

The utility model discloses in, the upper surface of three-way valve body 3 links to each other with the lower surface of valve gap 2, and one or more valve gap through-hole 22 passes through valve gap 2 to approximately right angled angle connection is at the upper surface of three-way valve body 3 for accept bolt, double-screw bolt or other fasteners. Bolts or studs and other fasteners are passed through the bonnet throughbore 22 to engage the first threaded groove 34 in the three-way valve body 3, thus tightly securing the bonnet 2 to the three-way valve body 3. The bonnet 1 is reversibly attached to the upper surface of the bonnet 2 and is pinned to the valve stem 51 to secure the valve element within the flow passage.

In another embodiment of the present invention, no projection is provided outside the sealing collar 7, so that different types of seals can be used between the valve head 52 and the inner wall of the second flow passage 31, and between the valve rod 51 and the inner wall of the valve cover 2.

Those skilled in the art will recognize from the above description that the relief valve can be disassembled by removing the support bolts in the first screw grooves 34 of the three-way valve body 3, thereby detaching the bonnet 2 and the sealing collar 7 from the three-way valve body 3. By removing the bonnet 2 and the sealing collar 7 in this way, and removing the base 4 from the three-way valve body 3 in the same way, the seals of the first boss 71, the second boss 72 and the third boss 44 can be easily removed, thereby facilitating replacement when resetting the safety valve for maintenance. Furthermore, because the utility model discloses well reset relief valve can conveniently dismantle the sealed of each boss, consequently, installation and fixed sealing are also more convenient than traditional reset relief valve. In the reset relief valves used today and before, it is not uncommon that some of the seals must be pressed or otherwise deformed during seal installation, which may cause damage to the seals, even if the seals are placed in the reset relief valve, it is difficult to secure them in place in the corresponding seal grooves. It will also be clear to one skilled in the art that during installation of the seal of the reset relief valve of the present invention, the seal need not be folded, rolled or otherwise deformed, and that a seal made of a harder material can be used to better withstand the pressure of the fluid in the flow passage. In addition to the presently known seals that are commercially available, the reset safety valve of the present invention may also use U-seals, V-spring loaded seals, and polymeric seals as they are often said. Although not specifically required in some cases, the present invention may also optionally use a seal reinforced with a metallic material for increased durability and pressure resistance. Based on as above reason and combine the utility model discloses a relevant design, the utility model discloses reset relief valve can obtain high-efficient advantageous the application in high-pressure operating system.

Also included in the reset relief valve are means mounted in the bonnet 1 for urging the piston 5 into a first position, i.e. a reset relief valve closed position, as shown in fig. 1, and reset means, i.e. after the piston 5 has been moved to a second position, as shown in fig. 3, for resetting the piston 5 to the first position, thereby re-closing the reset relief valve. Such reset mechanisms are well known in the art and will not be described in detail herein.

The utility model also provides a use method of this balanced cushion chamber, specifically as follows:

as shown in fig. 1, step 1, the piston 5 of the safety valve is reset to a closed state, which is a first position.

As shown in fig. 3, step 2. passing a fluid at a predetermined pressure from the first channel inlet 42; when the piston 5 is subjected to pressure from the fluid in the first flow passage 41, the piston 5 moves upward, with the piston in an open state, which is a second position.

Step 3, when the piston is in the second position, fluid flows into the second flow passage 31 and is discharged through the discharge end 32 and the discharge port 33.

The piston 5 has at least one through hole 53 on the upper surface thereof, and when the fluid pressure in the first flow passage 41 exceeds a predetermined pressure value, the piston 5 moves upward, and a part of the fluid enters the second flow passage 31, and is discharged through the discharge end 32 and the discharge port 33. Another part of the fluid flows into the piston 5 and out through the through holes 53 in the upper surface of the piston 5 to allow the piston 5 to occupy the closed valve chamber 6 and open the flow passage, thereby absorbing and reducing the acceleration and deceleration forces encountered by the piston 5 when releasing pressure.

In the utility model provides a balanced cushion chamber that is used for reset relief valve of pressure rating 35Mpa above, when piston 5 moved because of the release of valve cap 1, the existence of restricted fluid in the airtight valve chamber 6 has restricted piston 5's rate of movement because this restricted fluid must flow out through second runner 31 under the pressure of first runner 41 to allow the piston to occupy airtight valve chamber 6 and open the runner, thereby absorb and reduce the acceleration and deceleration force that piston 5 met when releasing pressure.

The method further comprises allowing a portion of the fluid in the flow passage to pass through the through-holes 53 in the upper surface of the piston 5 into the closed valve chamber 6 above the piston 5, holding the piston in engagement with the outside of the top of the piston by means of a sealing gasket 7, securing the sealing gasket 7 in the three-way valve body 3, attaching the valve cap 2 to the three-way valve body 3, the valve cap 2 being subjected to the force generated by the pressure of the fluid in the closed valve chamber 6, the piston 5 being subjected to the force generated by the pressure of the fluid in the flow passage, and the piston being moved from the first position to the second position when the pressure of the fluid in the flow passage exceeds.

For the test the utility model provides a pressure level that is used for the balanced cushion chamber of the reset relief valve more than 35Mpa of pressure level to be applicable to, the utility model provides an following embodiment and comparative example.

Example 1

By adopting the reset safety valve and the method for releasing the fluid pressure, the preset pressure is 50 Mpa; the fluid pressure in the first flow channel 41 is 56Mpa (the fluid pressure in the first flow channel 41 is 56Mpa measured by the 2D1SY electric pressure test pump), the piston 5 moves upward, and a part of the fluid enters the second flow channel 31 and is discharged through the discharge end 32 and the discharge port 33. Another part of the fluid flows into the piston 5 and out through the through holes 53 in the upper surface of the piston 5 to allow the piston 5 to occupy the closed valve chamber 6 and open the flow passage, thereby absorbing and reducing the acceleration and deceleration forces encountered by the piston 5 when releasing pressure. A part of fluid in the flow passage enters a closed valve cavity 6 above a piston 5 through a through hole 53 on the upper surface of the piston 5, the closed valve cavity is kept jointed with the outer side of the top of the piston by a sealing retainer ring 7, the sealing retainer ring 7 is fixed in a three-way valve body 3, a valve cover 2 is connected on the three-way valve body 3, the valve cover 2 bears the force generated by the fluid pressure in the closed valve cavity 6, and the piston 5 bears the force generated by the fluid pressure in the flow passage.

Example 2

The same as in example 1, except that the pressure of the fluid introduced into the first flow passage 41 was measured to be 65Mpa by using a 2D1SY electric pressure test pump.

Example 3

The same as in example 1, except that the pressure of the fluid introduced into the first flow passage 41 was measured to be 70Mpa by using a 2D1SY electric pressure test pump.

Comparative example 1

Adopt the utility model discloses the spring that mentions in the background art resets relief valve, and predetermined pressure 20Mpa adopts 2D1SY electric pressure testing pump to survey the fluid pressure who lets in the runner to be 25 Mpa.

Comparative example 2

The same as comparative example 1, except that the predetermined pressure was 30Mpa, the pressure of the fluid introduced into the flow passage was 35Mpa as measured by a 2D1SY electric pressure test pump.

Comparative example 3

The same as comparative example 1, except that the predetermined pressure was 35Mpa, the pressure of the fluid introduced into the flow passage was 37Mpa as measured by a 2D1SY electric pressure test pump.

TABLE 1 pressure ratings for measured reset relief valves for examples 1-3 and comparative examples 1-3

As can be seen from the contents of table 1, the pressure rating of the spring type reset relief valve provided in comparative example 1 is suitable for a pressure rating of 35Mpa or less; the pressure grade of the balance buffer cavity for resetting the safety valve with the pressure grade of more than 35Mpa reaches 56-70 Mpa.

Claims (4)

1. A balance buffer cavity for a reset safety valve with the pressure grade of more than 35Mpa is characterized by comprising a piston and a closed valve cavity; the piston comprises a valve stem and a valve head; the closed valve cavity is formed by enclosing the upper surface of the valve head and a sealing retainer ring together; the sealing retainer ring is sealed in the inner cavity of the three-way valve body of the reset safety valve; the upper surface of the valve head is provided with at least one through hole.

2. The balance buffer chamber for a reset safety valve with a pressure grade of above 35Mpa as claimed in claim 1, characterized in that the top of the sealing collar is provided with a first boss; the lower surface of the valve cover of the reset safety valve is provided with a first counter bore matched with the first boss; the first boss is connected with the first counter bore in a sealing mode.

3. The balance buffer chamber for a reset relief valve with a pressure level above 35Mpa of claim 1, wherein the outer surface of the sealing collar is provided with a second boss; a second counter bore matched with the second boss is arranged in the inner cavity of the three-way valve body of the reset safety valve; the second boss is connected with the second counter bore in a sealing mode.

4. The equalizing buffer chamber for a reset relief valve at a pressure level of 35Mpa or greater of claim 1, wherein the equalizing buffer chamber is used for a reset relief valve at a pressure level of 56-70 Mpa.

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