Ultrahigh-pressure hydraulic direct control valve

Abstract

The invention relates to the technical field of hydraulic control valves, and discloses an ultrahigh pressure hydraulic direct control valve which comprises a valve cover, a flow guide part serving as a control part and a valve body, the valve cover and the valve body are combined and fixed through a plurality of fasteners, and a valve seat is embedded in the side, close to the valve cover, of the interior of the valve body. The flow guide piece is installed in the valve body and located at the tail end of the valve seat, and two high-pressure oil connectors are installed at the upper end of the valve body. According to the direct control valve, the fixed valve clack (the flow guide piece) is innovatively adopted, the valve seat is designed to be a controllable moving piece, and the leakage risk at the penetrating position of the valve rod is fundamentally eliminated.

Description

Technical Field

[0001] This invention relates to the field of hydraulic control valve technology, and in particular to an ultra-high pressure hydraulic direct control valve. Background Technology

[0002] A hydraulic direct-control valve is one in which the movement of the valve core (opening, closing, or reversing) is directly driven by a force acting on the valve core, and this force usually comes directly from the operator (manually, by foot) or a power source such as an electromagnet. It does not require pilot pressure oil from the system for control and is independent of the control oil circuit.

[0003] Existing hydraulic valves have fixed or floating valve seats, but they are not controllable. The valve disc (flow guide) is the control component, and it is necessary to install a manual or actuator outside the valve body to control the valve disc through the shaft. This leads to the risk of external leakage during use.

[0004] Therefore, this application provides an ultra-high pressure hydraulic direct control valve to solve the problems mentioned in the background art. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an ultra-high pressure hydraulic direct control valve. Through the innovative structure of fixed flow guide and controllable moving valve seat, the risk of external leakage caused by valve stem penetration is eliminated. At the same time, the flow guide structure is optimized to solve the problems of turbulence and cavitation under high pressure conditions.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An ultra-high pressure hydraulic direct control valve includes a valve cover, a flow guide as a control component, and a valve body. The valve cover is fixed to the valve body by a combination of multiple fasteners. A valve seat is embedded inside the valve body near the valve cover. The flow guide is installed inside the valve body and located at the end of the valve seat. Two high-pressure oil ports are installed on the upper end of the valve body. The valve seat is driven by external hydraulic oil and moves axially along the inner wall of the valve body to adjust the gap between it and the flow guide, thereby controlling the flow channel opening.

[0008] Furthermore, an annular groove is provided at the contact surface between the end of the valve cover and the valve body, and a No. 1 sealing ring is embedded in the annular groove. The No. 1 sealing ring is made of fluororubber and is used to achieve static sealing of the joint surface between the valve cover and the valve body.

[0009] Furthermore, multiple sealing elements are fixedly provided at the contact surfaces between the outer wall of the valve seat and the valve cover and the inner wall of the valve body. The sealing elements include a guide ring and a combined sealing ring. The guide ring guides the axial movement of the valve seat, and the combined sealing ring achieves dynamic sealing between the valve seat and the valve cover and valve body.

[0010] Furthermore, a second sealing ring is fixedly fitted onto the outer wall of the valve seat near the end. The outer ring of the second sealing ring is tightly attached to the inner wall of the valve body to enhance the radial sealing of the valve seat under ultra-high pressure conditions and prevent the medium from leaking along the outer wall of the valve seat into the downstream cavity.

[0011] Furthermore, the valve seat is hollow inside, and a No. 3 sealing ring is embedded at the end of the hollow cavity where it contacts the flow guide. The No. 3 sealing ring is a metal-coated gasket. When the valve seat moves to the closed position, the No. 3 sealing ring achieves a high-pressure seal between the valve seat and the flow guide. The flow guide has a streamlined conical structure, and its conical surface curvature is adapted to the fluid flow trajectory to reduce turbulence and cavitation when the fluid passes through, thereby reducing noise and vibration.

[0012] Furthermore, a rear cover is threadedly installed at the opening at the rear end of the valve body. The threaded connection between the rear cover and the valve body is coated with high-pressure sealant. The rear cover is used for the installation and maintenance of the flow guide and also withstands the medium pressure under ultra-high pressure conditions. The fasteners are high-strength bolts with a strength grade of not less than 12.9, used to ensure the connection strength between the valve cover and the valve body under ultra-high pressure conditions.

[0013] The present invention has the following beneficial effects:

[0014] This invention proposes an ultra-high pressure hydraulic direct-control valve. Compared to conventional valves, which typically have fixed or floating but uncontrollable valve seats, and require a manual mechanism or actuator mounted outside the valve body to drive the valve disc via a shaft, this valve presents a risk of external leakage. The direct-control valve proposed in this invention innovatively employs a fixed valve disc (flow guide), designing the valve seat as a controllable moving part, fundamentally eliminating the risk of external leakage at the valve stem penetration point. Suitable for ultra-high pressure applications, the valve disc (flow guide) is designed with a streamlined conical shape, significantly reducing turbulence and cavitation during fluid flow, and minimizing noise and vibration. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the internal structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the overall structure of the present invention;

[0017] Figure 3 For the present invention Figure 2 Another perspective structural diagram;

[0018] Figure 4 This is a schematic diagram of the high-pressure oil interface of the present invention.

[0019] Legend:

[0020] 1. Valve cover; 2. Fasteners; 3. Seals; 4. Valve seat; 5. Flow guide; 6. Valve body; 7. High-pressure oil interface; 8. No. 1 sealing ring; 9. No. 2 sealing ring; 10. No. 3 sealing ring. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Reference Figures 1-4 The present invention provides an embodiment of an ultra-high pressure hydraulic direct control valve, comprising a valve cover 1, a flow guide 5 as a control component, and a valve body 6. The valve cover 1 is fixed to the valve body 6 by a plurality of fasteners 2. A valve seat 4 is embedded in the valve body 6 on the side near the valve cover 1. The flow guide 5 is installed inside the valve body 6 and located at the end of the valve seat 4. Two high pressure oil ports 7 are installed on the upper end of the valve body 6.

[0023] Specifically, the valve seat 4 can be used as an axial moving part, and the gap between it and the guide part 5 can be controlled by external hydraulic drive to adjust the flow channel opening.

[0024] In one embodiment of the present invention, an annular groove is provided at the contact surface between the end of the valve cover 1 and the valve body 6, and a first sealing ring 8 is embedded in the annular groove; the first sealing ring 8 is used for static sealing of the joint surface between the valve cover 1 and the valve body 6 to prevent high pressure fluid from leaking out from the connection.

[0025] In one embodiment of the present invention, a plurality of sealing elements 3 are fixedly provided at the contact surface between the outer wall of the valve seat 4 and the inner wall of the valve cover 1 and the valve body 6; the sealing element 3 may include a combination of a guide ring and a sealing ring, which not only guides the movement of the valve seat 4, but also realizes dynamic sealing between the valve seat 4 and the valve cover 1 and the valve body 6.

[0026] In one embodiment of the present invention, a second sealing ring 9 is fixedly sleeved on the outer wall of the valve seat 4 near the end, and the outer ring of the second sealing ring 9 is tightly attached to the inner wall of the valve body 6; the second sealing ring 9 further strengthens the radial sealing of the valve seat 4 under high pressure and prevents the medium from leaking along the outer wall of the valve seat 4 to the downstream cavity.

[0027] In one embodiment of the present invention, the valve seat 4 is hollow inside and a No. 3 sealing ring 10 is embedded at the end of the hollow cavity where it contacts the flow guide 5; the No. 3 sealing ring 10 is used for end face sealing when the valve seat 4 and the flow guide 5 are in contact, and when the valve seat 4 moves forward to the closed position, high pressure sealing of the valve port is achieved.

[0028] In one embodiment of the present invention, a rear cover is threadedly installed at the opening at the end of the valve body 6; the rear cover is in the shape of a cylindrical ring, which serves as an auxiliary obstruction and ensures the normal flow of the valve body 6, while facilitating the installation and maintenance of the guide 5, and its threaded connection structure adapts to the load-bearing requirements under high pressure conditions.

[0029] In this invention, the two high-pressure oil ports 7 are the inlet and outlet ports, respectively. Externally driven hydraulic oil enters the cavity between the valve seat 4 and the valve cover 1 through the inlet port. The hydraulic oil pressure acts on the valve seat end face, pushing the valve seat to move axially. The outlet port is used for hydraulic oil return, which, together with the spring reset mechanism or reverse hydraulic pressure, realizes the valve seat reset, thereby completing the precise adjustment of the flow channel opening. The sealing element 3 (guide ring + combined sealing ring) is responsible for the dynamic sealing during the axial movement of the valve seat, continuously blocking medium leakage when the valve seat reciprocates. At the same time, the guide ring ensures the coaxiality of the valve seat movement. The second sealing ring 9 is responsible for the radial reinforcement sealing when the valve seat moves to the limit position, further preventing high-pressure medium from entering the downstream cavity under ultra-high pressure conditions, forming a double protection with the sealing element 3. The streamlined conical structure of the guide element is adapted to the fluid flow trajectory, allowing the high-pressure fluid to transition smoothly along the conical surface, avoiding the formation of eddies at the valve port, and reducing the conditions for cavitation from the root. Experimental results show that, compared with the traditional flat plate valve disc structure, the streamlined conical guide of the present invention can reduce turbulence intensity by 35%, reduce cavitation damage by 40%, reduce operating noise by 15dB, and extend valve service life by more than 2 times.

[0030] Working principle: This direct-control valve is driven by external hydraulic oil through the high-pressure oil interface 7 to move the valve seat 4 axially. When the valve seat 4 moves backward, it forms an annular flow channel with the fixed guide member 5, allowing the medium to pass through. When the valve seat 4 moves forward, the flow channel gradually narrows until it closes. At this time, the inner end face of the valve seat 4 is tightly fitted with the conical surface of the guide member 5 through the No. 3 sealing ring 10, achieving a seal. Since the guide member 5 is fixed and the valve seat 4 is controlled, there is no dynamic sealing structure penetrating the valve body 6, completely eliminating external leakage. The streamlined conical design of the guide member 5 can guide the fluid to transition smoothly, reducing noise and vibration under high speed and high pressure.

[0031] Example 1: The ultra-high pressure hydraulic direct control valve provided in this example includes a valve cover 1, a fastener 2, a seal 3, a valve seat 4, a flow guide 5, a valve body 6, a high pressure oil interface 7, a first sealing ring 8, a second sealing ring 9, and a third sealing ring 10.

[0032] Assembly relationship: Valve cover 1 is fixed to valve body 6 by 12.9 grade high strength bolts. Valve seat 4 is embedded in the side of valve body 6 near valve cover 1 and can slide axially along the inner wall of valve body 6. The guide 5 is fixed to a preset position inside valve body 6 by welding and is located at the end of valve seat 4. The two high pressure oil ports 7 at the upper end of valve body 6 are respectively connected to the oil inlet and oil return port of driving hydraulic oil. The rear cover is threadedly installed at the end of valve body 6, and the threaded connection between the rear cover and valve body 6 is coated with high pressure sealant.

[0033] Sealing structure: The first sealing ring 8 between the valve cover 1 and the valve body 6 is made of fluororubber, which is resistant to high pressure and oil; the sealing element 3 on the outer wall of the valve seat 4 is composed of a polytetrafluoroethylene guide ring and a nitrile rubber combined sealing ring, which takes into account both guiding accuracy and dynamic sealing performance; the second sealing ring 9 at the end of the valve seat 4 is made of polytetrafluoroethylene, which can meet the radial sealing requirements under high pressure conditions; the third sealing ring 10 between the valve seat 4 and the flow guide 5 is a metal-coated gasket, which can withstand the end face sealing pressure under ultra-high pressure.

[0034] Working principle: Externally driven hydraulic oil enters the cavity between valve seat 4 and valve cover 1 through high-pressure oil port 7, pushing valve seat 4 to move axially along the inner wall of valve body 6. When valve seat 4 moves backward, it forms an annular flow channel with the fixed guide member 5, allowing the high-pressure medium to flow through the channel. When valve seat 4 moves forward, the opening of the flow channel gradually decreases until the No. 3 sealing ring 10 on the inner end face of valve seat 4 is tightly fitted with the conical surface of guide member 5, achieving complete closure of the valve port. Since guide member 5 is fixedly installed, there is no need for the valve stem to penetrate the valve body 6, completely eliminating the risk of external leakage; the streamlined conical guide member 5 guides the fluid to a smooth transition, reducing turbulence and cavitation, and reducing noise and vibration.

[0035] This invention eliminates the traditional through-body valve stem structure, employing a controllable moving valve seat and a fixed flow guide design, eliminating dynamic sealing penetration points and fundamentally solving the problem of media leakage under ultra-high pressure conditions. The streamlined conical structure of the flow guide adapts to the fluid flow trajectory, reducing eddies and impacts during fluid passage, minimizing cavitation damage to the valve, and significantly reducing operating noise and vibration. Multi-stage sealing enhances reliability: Through a multi-stage sealing structure design including static sealing, dynamic sealing, radial sealing, and end-face sealing, the valve's sealing performance under ultra-high pressure conditions is comprehensively improved, adapting to harsh working environments. Convenient maintenance: The threaded rear cover at the valve body facilitates the disassembly and replacement of the flow guide and seals, reducing subsequent maintenance costs.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An ultra-high pressure hydraulic direct control valve, comprising a valve cover (1), a flow guide (5) as a control element, and a valve body (6), characterized in that: The valve cover (1) is fixed to the valve body (6) by a combination of multiple fasteners (2). A valve seat (4) is embedded in the valve body (6) on the side close to the valve cover (1). The flow guide (5) is installed inside the valve body (6) and located at the end of the valve seat (4). Two high-pressure oil ports (7) are installed on the upper end of the valve body (6). The valve seat (4) is driven by external hydraulic oil and moves axially along the inner wall of the valve body (6) to adjust the gap between it and the flow guide (5) and realize the control of the flow channel opening.

2. The ultra-high pressure hydraulic direct control valve according to claim 1, characterized in that: An annular groove is provided at the contact surface between the valve cover (1) and the valve body (6), and a No. 1 sealing ring (8) is embedded in the annular groove. The No. 1 sealing ring (8) is made of fluororubber and is used to achieve static sealing of the joint surface between the valve cover (1) and the valve body (6).

3. The ultra-high pressure hydraulic direct control valve according to claim 1, characterized in that: Multiple sealing elements (3) are fixedly provided at the contact surfaces between the outer wall of the valve seat (4) and the inner wall of the valve cover (1) and valve body (6). The sealing elements (3) include a guide ring and a combined sealing ring. The guide ring guides the axial movement of the valve seat (4), and the combined sealing ring achieves dynamic sealing between the valve seat (4) and the valve cover (1) and valve body (6).

4. The ultra-high pressure hydraulic direct control valve according to claim 1, characterized in that: A second sealing ring (9) is fixedly fitted on the outer wall of the valve seat (4) near the end. The outer ring of the second sealing ring (9) is tightly attached to the inner wall of the valve body (6) to strengthen the radial sealing of the valve seat (4) under ultra-high pressure conditions and prevent the medium from leaking along the outer wall of the valve seat (4) to the downstream cavity.

5. The ultra-high pressure hydraulic direct control valve according to claim 1, characterized in that: The valve seat (4) is hollow inside, and a No. 3 sealing ring (10) is embedded at the end of the hollow cavity where it meets the guide (5). The No. 3 sealing ring (10) is a metal-coated gasket. When the valve seat (4) moves to the closed position, the No. 3 sealing ring (10) achieves high-pressure sealing of the end face between the valve seat (4) and the guide (5).

6. The ultra-high pressure hydraulic direct control valve according to claim 1, characterized in that: The flow guide (5) is a streamlined conical structure, and its conical surface curvature is adapted to the fluid flow trajectory to reduce turbulence and cavitation when the fluid passes through, and reduce noise and vibration.

7. The ultra-high pressure hydraulic direct control valve according to claim 1, characterized in that: A rear cover is threadedly installed at the opening at the end of the valve body (6). The threaded connection between the rear cover and the valve body (6) is coated with high-pressure sealant. The rear cover is used for the installation and maintenance of the flow guide (5) and also withstands the medium pressure under ultra-high pressure conditions.

8. The ultra-high pressure hydraulic direct control valve according to claim 1, characterized in that: The fastener (2) is a high-strength bolt with a strength grade of not less than 12.9, which is used to ensure the connection strength between the valve cover (1) and the valve body (6) under ultra-high pressure conditions.

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