Double-sealing self-locking fire safety valve and unlocking and opening method thereof
By designing a double-sealed self-locking fire safety valve, the connecting rod self-locking mechanism reduces wear on the sealing surface, achieving self-reinforcing sealing. The unlocking mechanism prevents misoperation, thus solving the problems of sealing surface wear and misoperation in traditional valves and improving the valve's service life and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-03-10
- Publication Date
- 2026-04-07
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Traditional valves suffer severe wear on the sealing surface during opening and closing, affecting their service life and lacking safety features to prevent misoperation. In existing technologies, the safety and sealing problems of transmission-driven gate valves during opening and closing have not been effectively solved.
A double-seal self-locking fire safety valve is designed. The valve achieves no contact or slight contact between the sealing surfaces when closed through a linkage self-locking mechanism, utilizes the medium pressure to form a self-reinforcing effect, and ensures the correct opening sequence through an unlocking mechanism to prevent misoperation.
This reduces wear on the sealing surface, extends service life, ensures reliable self-locking seals, prevents accidental opening, and improves operational safety and sealing reliability.
Smart Images
Figure CN121803671A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of valve technology, and in particular to a double-sealed self-locking fire safety valve and its unlocking and opening method. Background Technology
[0002] In critical industrial sectors such as fire protection and petrochemicals, valves used not only require excellent sealing performance and reliable bidirectional sealing, but also extremely high operational safety and long-term reliability. Traditional gate valves often experience significant friction between the sealing surface and the valve seat during opening and closing, easily leading to wear on the sealing surface, affecting sealing performance and valve lifespan. Furthermore, conventional valves lack safety mechanisms to prevent misoperation, which can have serious consequences in emergency systems such as fire protection. Therefore, there is an urgent need to develop a double-sealed, self-locking fire safety valve that can reduce sealing surface wear, extend service life, and achieve reliable self-locking after closure to prevent accidental opening, along with its unlocking and opening method. Summary of the Invention
[0003] In order to overcome the shortcomings of traditional gate valves, which are prone to wear on the sealing surface during opening and closing, affecting the sealing effect and valve life, and lacking a safety mechanism to prevent misoperation, the present invention aims to provide a double-seal self-locking fire safety valve and its unlocking and opening method that can reduce wear on the sealing surface, extend service life, and achieve reliable self-locking sealing after closing to prevent accidental opening.
[0004] This invention is achieved through the following specific technical means: A double-sealed self-locking fire safety valve includes a valve body; a valve cover mounted on the upper end of the valve body; a mounting bracket mounted on the upper end of the valve cover; a valve stem nut mounted on the mounting bracket; a valve stem rotatably mounted on the valve body and the valve cover via the valve stem nut; a gland and a sealing cover are installed at the connection between the valve stem and the valve cover; packing is filled between the gland and the sealing cover; a handwheel is fixedly connected to the upper end of the valve stem; and two relatively fixed sealing seats are provided in the cavity of the valve body. It also includes a double-sealed gate assembly connected to the lower end of the valve stem and sealingly engaged with two sealing rings; the double-sealed gate assembly includes a main body with a central mounting through hole; two sealing plates symmetrically slidably disposed on both sides of the through hole of the main body, the opposite end faces of the two sealing plates being sealing surfaces for engaging with the sealing surfaces of the corresponding sealing rings; a linkage self-locking mechanism is provided between the two sealing plates, used to drive the two sealing plates to move in opposite directions when the double-sealed gate assembly moves to the closed position, so that the sealing surfaces of the sealing plates press tightly against the sealing rings and form a self-lock; on the valve body, a unlocking mechanism is provided on the lower side relative to the double-sealed gate assembly, cooperating with the linkage self-locking mechanism, for releasing the self-locking mechanism.
[0005] Furthermore, the linkage self-locking mechanism includes two linkage groups symmetrically arranged at the upper and lower ends of the two sealing plates; the linkage group includes a first linkage and a second linkage; one end of the first linkage is hinged to one sealing plate, one end of the second linkage is hinged to another sealing plate, and the other ends of the first linkage and the second linkage are hinged to each other to form a hinge point; the hinge points of the two linkage groups on the upper and lower sides are connected to each other by a connecting rod; the linkage self-locking mechanism also includes a push rod, the upper end of the push rod is hinged to the hinge point of the lower linkage group, and the lower end of the push rod extends through to the lower side of the main body.
[0006] Furthermore, the bottom of the inner wall of the valve body is provided with a groove for accommodating the lower end of the push rod; when the lower end of the push rod extends into the groove and contacts the bottom of the groove, the push rod is blocked and stops descending. At this time, the connecting rod assembly is pushed upward by the push rod and is forced to unfold and pass the mechanical dead point, thereby pressing the two sealing plates together to seal the sealing seat ring and achieving self-locking.
[0007] Furthermore, the unlocking mechanism includes a locking rod, which is threadedly mounted on the valve body and located to the side of the lower end of the push rod; the lower end of the push rod has a locking hole that engages with the locking rod for locking; rotating the locking rod allows one end of the locking rod to extend into or retract from the locking hole, thereby locking the push rod onto the valve body or releasing it.
[0008] Furthermore, it also includes an elastic push assembly, which is disposed on the valve body and acts on the lower end of the push rod. The elastic push assembly includes a push rod, a plug, and a spring. The push rod is slidably mounted on the valve body, with one end in contact with the lower end of the push rod. The plug is fixedly connected to the valve body by a thread. A spring is disposed between the push rod and the plug. One end of the spring abuts against the push rod, and the other end abuts against the plug. It is used to apply a continuous upward holding force to the push rod after the linkage self-locking mechanism reaches the mechanical dead point position.
[0009] Furthermore, the linkage self-locking mechanism also includes several baffles; the baffles are respectively disposed on the upper side of the linkage assembly and fixedly connected to the opposite end faces of the two sealing plates; used to restrict the linkage assembly on the upper and lower sides from continuing to move upward after reaching the mechanical dead point position.
[0010] Furthermore, the main body is provided with a sliding groove, and the inner wall of the valve body cavity is provided with a guide rib that slides with the sliding groove; this is used to restrict the double-sealed gate assembly to move only in the vertical direction.
[0011] Furthermore, a method for unlocking and opening a double-sealed self-locking fire safety valve includes the following steps: S1: Rotate the locking rod forward so that its end extends into the locking hole at the lower end of the push rod to lock the push rod; S2: Reverse rotation of the handwheel drives the main plate upward through the valve stem; since the push rod is locked, the upward movement of the main plate forces the connecting rod assembly to deform, disengage from the mechanical dead point and retract, thereby pulling the two sealing plates to move towards each other, retracting into the through hole of the main plate, and releasing the seal with the sealing seat ring; S3: Rotate the locking rod in the opposite direction so that its end exits from the locking hole of the push rod; S4: Continue to rotate the handwheel in the opposite direction to lift the double-sealed gate assembly to the upper part of the valve body cavity, so that the valve is fully open.
[0012] Compared with the prior art, the present invention has the following beneficial effects: This invention achieves the effects of reducing wear on the sealing surface, extending service life, and providing a reliable self-locking seal after closure to prevent accidental opening, thereby improving the sealing reliability, operational safety, and overall service life of the valve in application.
[0013] During the closing process, the sealing plate and the sealing seat ring have no contact or only slight contact for most of the stroke, and are only pressed together at the moment of closing, which greatly reduces the friction and wear of the sealing surface and extends the service life of the valve.
[0014] The linkage mechanism overcomes the mechanical dead point to achieve self-locking and converts the pressure of the pipeline medium into a force that further tightens the sealing surface, forming a self-reinforcing effect and ensuring the long-term reliability of the bidirectional seal.
[0015] The valve must be opened in a mandatory sequence of "locking the push rod first, then reversing the handwheel" to effectively prevent abnormal opening caused by accidental handwheel turning. It is especially suitable for safety-sensitive systems such as fire protection systems. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the first cross-sectional structure of the present invention.
[0017] Figure 2 This is a schematic diagram of the second cross-sectional front view structure of the present invention.
[0018] Figure 3 This is a three-dimensional structural diagram of the valve body of the present invention.
[0019] Figure 4 This is a schematic diagram of the three-dimensional structure of the double-sealed gate of the present invention.
[0020] Figure 5 This is a schematic cross-sectional view of the first type of double-sealed gate assembly of the present invention.
[0021] Figure 6 This is a schematic diagram of a second cross-sectional structure of the double-sealed gate assembly of the present invention.
[0022] Figure 7 This is a three-dimensional structural diagram of the linkage self-locking mechanism of the present invention.
[0023] Figure 8 This is a partial cross-sectional view of the present invention.
[0024] The labels in the attached diagram are as follows: 1-valve body, 2-valve cover, 3-mounting bracket, 4-valve stem nut, 5-valve stem, 6-gland, 7-sealing cover, 8-packing, 9-handwheel, 10-sealing seat ring, 11-double-sealed gate assembly, 12-unlocking mechanism, 13-elastic push assembly, 101-groove, 102-guide rib, 111-main body, 112-sealing plate, 113-linkage assembly, 1131-first link, 1132-second link, 114-connecting rod, 115-push rod, 116-baffle, 121-locking rod, 122-locking hole, 131-push rod, 132-plug, 133-spring. Detailed Implementation
[0025] The present invention will be further described below with reference to the accompanying drawings: Example
[0026] A double-sealed self-locking fire safety valve, such as Figures 1-8 As shown, the valve includes a valve body 1; a valve cover 2 mounted on the upper end of the valve body 1; a mounting bracket 3 mounted on the upper end of the valve cover 2; a valve stem nut 4 mounted on the mounting bracket 3; a valve stem 5 rotatably mounted on the valve body 1 and the valve cover 2 via the valve stem nut 4; a pressure cap 6 and a sealing cap 7 are installed at the connection between the valve stem 5 and the valve cover 2; a packing 8 is filled between the pressure cap 6 and the sealing cap 7; a handwheel 9 is fixedly connected to the upper end of the valve stem 5; and two relatively fixed sealing seats 10 are provided in the cavity of the valve body 1. It also includes a double-sealed gate assembly 11 connected to the lower end of the valve stem 5 and sealingly engaged with the two sealing rings 10; the double-sealed gate assembly 11 includes a main body 111 with a central mounting through hole; two sealing plates 112 symmetrically slidably disposed on both sides of the through hole of the main body 111, the opposite end faces of the two sealing plates 112 being sealing surfaces for engaging with the sealing surfaces of the corresponding sealing rings 10; a connecting rod self-locking mechanism is provided between the two sealing plates 112, which drives the two sealing plates 112 to move in opposite directions when the double-sealed gate assembly 11 moves to the closed position, so that the sealing surfaces of the sealing plates 112 press and seal against the sealing rings 10, forming a self-lock; on the valve body 1, a unlocking mechanism 12 is provided on the lower side relative to the double-sealed gate assembly 11, which engages with the connecting rod self-locking mechanism and is used to release the self-locking mechanism of the connecting rod self-locking mechanism. The linkage self-locking mechanism includes two linkage groups 113 symmetrically arranged at the upper and lower ends of two sealing plates 112; the linkage group 113 includes a first linkage 1131 and a second linkage 1132; one end of the first linkage 1131 is hinged to one sealing plate 112, one end of the second linkage 1132 is hinged to the other sealing plate 112, and the other ends of the first linkage 1131 and the second linkage 1132 are hinged to each other to form a hinge point; the hinge points of the two linkage groups 113 on the upper and lower sides are connected to each other through a connecting rod 114; the linkage self-locking mechanism also includes a push rod 115, the upper end of the push rod 115 is hinged to the hinge point of the lower linkage group 113, and the lower end of the push rod 115 extends through to the lower side of the main body 111; The unlocking mechanism 12 includes a locking rod 121, which is threadedly mounted on the valve body 1 and located to the side of the lower end of the push rod 115. The lower end of the push rod 115 has a locking hole 122 that engages with the locking rod 121 for locking. Rotating the locking rod 121 allows one end of the locking rod 121 to extend into or retract from the locking hole 122, thereby locking the push rod 115 onto the valve body 1 or releasing it.
[0027] Working principle: When the handwheel 9 is turned forward to close the valve, the valve stem 5 drives the entire double-seal gate assembly 11 to move downward within the valve cavity. During this process, the sealing plate 112 and the sealing seat ring 10 remain in a state of no contact or only slight contact for most of the stroke, greatly reducing friction and wear on the sealing surface. When the gate assembly descends to the bottom, the lower end of the push rod 115 of the linkage self-locking mechanism first extends into and contacts the bottom of the groove 101 at the bottom of the valve body 1, and stops descending due to obstruction. At this time, under the continuous rotation drive, the valve stem 5 continues to push the main plate body 111 downward. This relative movement forces the lower connecting rod group 113, which is hinged to the push rod 115, to receive an upward thrust, driving the hinge point to move upward, and through the connecting rod 114, it drives... The upper linkage 113 operates synchronously; under the action of the jacking force, the linkage 113 is forced to unfold and forcibly cross its designed mechanical dead point position, thereby smoothly pushing out the two sealing plates 112 and finally pressing the sealing seat ring 10; the linkage mechanism thus enters the self-locking state. In this state, when the pressure from the pipeline medium acts on the sealing plates 112, it will be converted into a force through the linkage mechanism to further press the two sealing plates 112 against each other, forming a self-reinforcing sealing effect; the sealing surfaces of the two sealing plates 112 are tightly pressed onto the sealing seat rings 10 on both sides, achieving a reliable bidirectional seal; this design ensures that the sealing surfaces are only subjected to force and fit in the final stage of closure, significantly extending the service life of the valve and ensuring the reliability of long-term sealing; the baffle 116 is used to limit the excessive upward movement of the linkage to ensure the stability of the self-locking position; at the same time, the elastic jacking assembly 13 on the valve body 1 provides a continuous upward holding force to the push rod 115, helping to maintain the linkage 113 in the self-locking state and preventing accidental unlocking.
[0028] When the valve needs to be opened, it is in a mechanically self-locking state, and directly lifting the valve stem 5 will not unlock it. To ensure operational safety, a specific procedure must be followed: First, the locking rod 121 installed on the side of the valve body 1 must be rotated forward so that its end is screwed into the locking hole 122 at the lower end of the push rod 115, thereby completely fixing the position of the push rod 115 relative to the valve body 1. In this state, the handwheel 9 is rotated in the reverse direction, and the valve stem 5 drives the main plate 111 to begin to move upward. Since the push rod 115 is locked by the locking rod 121 and cannot move with it, the upward movement of the main plate 111 forces the upper and lower connecting rod assemblies 113 connected to it to deform. Under the pulling force of the main plate 111, the connecting rod assemblies 113 are forced to change from the self-locking unfolded state that has passed the dead point to the retracted state, thereby pulling the two sealing plates 112 to move towards each other, causing their sealing surfaces to disengage from the sealing seat ring 10 and retract into the through hole of the main plate 111. This process actively unlocks the valve. In addition to the sealed state and mechanical self-locking, after the seal is unlocked, the locking rod 121 is rotated out in the opposite direction, so that its end exits the locking hole 122 of the push rod 115, releasing the fixation on the push rod 115; at this time, the handwheel 9 is rotated in the opposite direction, and the entire double-sealed gate assembly 11 can be smoothly lifted to the upper part of the valve cavity, realizing the full opening of the valve; the mandatory operation sequence of "locking the push rod 115 first, and then rotating the handwheel 9" effectively prevents abnormal opening caused by accidental rotation of the handwheel 9, and is particularly suitable for fire protection systems with extremely high safety requirements.
[0029] The linear motion of valve stem 5 drives the connecting rod self-locking mechanism. At the end of the closing stroke, the bottom of valve body 1 blocks the push rod 115 to trigger the mechanism to cross the dead point, achieving mechanical self-locking and final instantaneous smooth clamping, taking into account both low wear and high sealing performance. When opening, the locking step, which must be executed first, forces the mechanism to move in the opposite direction to disengage from the dead point, thereby achieving safe and controllable unlocking and opening, and comprehensively ensuring the sealing reliability and operational safety of the valve in critical applications.
[0030] Although this disclosure has been described in detail with reference to exemplary embodiments, it is not limited thereto, and it will be apparent to those skilled in the art that various modifications and changes may be made thereto without departing from the scope of this disclosure.
Claims
1. A double-sealed self-locking fire safety valve, comprising a valve body (1); a valve cover (2) installed on the upper end of the valve body (1); a mounting bracket (3) installed on the upper end of the valve cover (2); a valve stem nut (4) provided on the mounting bracket (3); a valve stem (5) rotatably installed on the valve body (1) and the valve cover (2) by the valve stem nut (4); a pressure cap (6) and a sealing cap (7) are installed at the connection between the valve stem (5) and the valve cover (2); a filler (8) is filled between the pressure cap (6) and the sealing cap (7); a handwheel (9) is fixedly connected to the upper end of the valve stem (5); and two relatively fixed sealing seats (10) are provided in the cavity of the valve body (1). Its features are, It also includes a double-sealed gate assembly (11) connected to the lower end of the valve stem (5) and sealingly engaged with the two sealing seats (10); the double-sealed gate assembly (11) includes a main body (111) with a central mounting through hole; two sealing plates (112) symmetrically slidably disposed on both sides of the through hole of the main body (111), the opposite end faces of the two sealing plates (112) being sealing surfaces, used to engage with the sealing surfaces of the corresponding sealing seats (10); A linkage self-locking mechanism is provided between the two sealing plates (112) to drive the two sealing plates (112) to move in opposite directions when the double sealing gate assembly (11) moves to the closed position, so that the sealing surfaces of the sealing plates (112) press and seal on the sealing seat ring (10) and form a self-lock; On the valve body (1), a unlocking mechanism (12) is provided on the lower side of the double sealing gate assembly (11) to cooperate with the linkage self-locking mechanism and to release the self-lock of the linkage self-locking mechanism. The linkage self-locking mechanism includes two linkage groups (113) symmetrically arranged at the upper and lower ends of the two sealing plates (112); the linkage group (113) includes a first linkage (1131) and a second linkage (1132); one end of the first linkage (1131) is hinged to a sealing plate (112), one end of the second linkage (1132) is hinged to another sealing plate (112), and the other ends of the first linkage (1131) and the second linkage (1132) are hinged to each other to form a hinge point; the hinge points of the two linkage groups (113) on the upper and lower sides are connected to each other through a connecting rod (114); the linkage self-locking mechanism also includes a push rod (115), the upper end of the push rod (115) is hinged to the hinge point of the lower linkage group (113), and the lower end of the push rod (115) extends through to the lower side of the main body (111).
2. The double-sealed self-locking fire safety valve according to claim 1, characterized in that, The bottom of the inner wall of the valve body (1) is provided with a groove (101) for accommodating the lower end of the push rod (115).
3. The double-sealed self-locking fire safety valve according to claim 1, characterized in that, The unlocking mechanism (12) includes a locking rod (121), which is threadedly installed on the valve body (1) and located on one side of the push rod (115); the lower end of the push rod (115) is provided with a locking hole (122) that cooperates with the locking rod (121) for locking.
4. The double-sealed self-locking fire safety valve according to claim 1, characterized in that, It also includes an elastic push assembly (13), which is disposed on the valve body (1) and acts on the lower end of the push rod (115). The elastic push assembly (13) includes a push rod (131), a plug (132) and a spring (133). The push rod (131) is slidably mounted on the valve body (1), and one end of it is in contact with the lower end of the push rod (115). The plug (132) is fixedly connected to the valve body (1) by a thread. A spring (133) is disposed between the push rod (131) and the plug (132). One end of the spring (133) abuts against the push rod (131) and the other end abuts against the plug (132).
5. A double-sealed self-locking fire safety valve according to claim 1, characterized in that, The connecting rod self-locking mechanism also includes several baffles (116); the several baffles (116) are respectively disposed on the upper side of the connecting rod assembly (113) and fixedly connected to the opposite end faces of the two sealing plates (112).
6. A double-sealed self-locking fire safety valve according to claim 1, characterized in that, The main body (111) is provided with a sliding groove, and the inner wall of the valve body (1) is provided with a guide rib (102) that slides with the sliding groove.
7. A method for unlocking and opening a double-sealed self-locking fire safety valve as described in any one of claims 1 to 6, characterized in that, Includes the following steps: S1: Rotate the locking rod (121) in the forward direction so that its end extends into the locking hole (122) at the lower end of the push rod (115) to lock the push rod (115). S2: Rotate the handwheel (9) in the opposite direction to drive the main body (111) upward through the valve stem (5); Since the push rod (115) is locked, the upward movement of the main body (111) forces the connecting rod assembly (113) to deform, break away from the mechanical dead point and retract, thereby pulling the two sealing plates (112) to move towards each other and retract into the through hole of the main body (111), releasing the seal with the sealing seat ring (10); S3: Rotate the locking rod (121) in the opposite direction so that its end exits from the locking hole (122) of the push rod (115); S4: Continue to rotate the handwheel (9) in the opposite direction to lift the double-sealed gate assembly (11) to the upper part of the cavity of the valve body (1) to achieve full opening of the valve.