CN219623280U - Hard sealing wedge type rising stem gate valve - Google Patents

Abstract

The utility model discloses a hard sealing wedge type open-lever gate valve, relates to the field of gate valves, and solves the problem that the residual service life of the gate valve cannot be judged in the use process. The top end of the valve rod is provided with an extension section penetrating out of the nut sleeve, a limit sleeve is fixedly arranged on the extension section, and a preset gap is formed between the bottom surface of the limit sleeve and the nearest end surface below the limit sleeve; the preset gap is a standard gap value when the valve is initially open and is considered to have no remaining life of the sealing surface when the preset gap is near or at 0. After the valve is used, the height of the limiting sleeve is reduced due to the abrasion of the sealing surface, the preset gap is gradually reduced until the preset gap reaches 0, the abrasion of the sealing surface is considered to be serious, and the fact that the valve has no residual service life is judged; the residual service life of the sealing surface can be judged through the limiting sleeve outside the gate valve, the sealing leakage failure caused by excessive abrasion of the sealing surface can be prevented, a sensor with high cost and complex calculation are not required to be added, and the structure is simple and easy to realize.

Description

Hard sealing wedge type rising stem gate valve

Technical Field

The utility model relates to the field of gate valves, in particular to a hard sealing wedge type rising stem gate valve.

Background

The open-lever gate valve is one kind of gate valve, and its work time rotates the hand wheel, through the advancing, withdrawing of the screw thread of hand wheel and valve rod, promotes or descends the flashboard of being connected with the valve rod, reaches the effect of opening and closing. The traditional rising stem gate valve is characterized in that the sealing surfaces of the gate plate and the valve seat are positioned in the valve body, so that the sealing surfaces can be gradually worn until the sealing surfaces leak in long-term use, and the residual service life of the sealing surfaces can not be judged outside the gate valve in the use process, so that the gate valve sealing surfaces can be used in the pipeline after being excessively worn easily, and the process pipeline is at risk of leakage due to closing failure of the gate valve. In the prior utility model patent: CN111507046B is a method and a system for predicting the remaining service life of an electric gate valve, which are characterized in that raw data obtained through acoustic emission sensors, acceleration sensors, pressure difference, temperature, voltage, current, flow and other process parameter sensors on the electric gate valve are stored in a computer through a data acquisition board card, the acquired raw parameters are subjected to data characteristic engineering and converted into three-dimensional data to be predicted, and the three-dimensional data to be predicted are input into a trained model for predicting the remaining service life of the electric gate valve, so that the remaining service life of the electric gate valve is obtained. However, various sensors are required to be installed in the gate valve, so that the gate valve has the advantages of increased cost, complex structure and very high requirements on data hardware, and cannot be simply applied to common valve enterprises.

Disclosure of Invention

The purpose of the utility model is that: in order to overcome the defects of the prior art, the utility model provides a hard sealing wedge type rising stem gate valve, which solves the problem that the residual service life of the valve cannot be judged in the use process.

The technical scheme of the utility model is as follows: the device comprises a valve rod, a hand wheel and a nut sleeve, wherein the nut sleeve is mounted in the hand wheel in a linkage way, the valve rod penetrates through the nut sleeve and is in threaded connection with the nut sleeve, an extension section penetrating out of the nut sleeve is arranged at the top end of the valve rod, a limit sleeve is fixedly mounted on the extension section, and a preset gap is formed between the bottom surface of the limit sleeve and the nearest end surface below the limit sleeve; the preset gap is a standard gap value when the valve is initially open and is considered to have no remaining life of the sealing surface when the preset gap is near or at 0.

By adopting the technical scheme, when the valve leaves a factory to fix the limit sleeve, the preset clearance is preset to be a clearance value meeting relevant standards, the clearance value is the abrasion allowance of the sealing surface of the gate valve, after the valve is used, the height of the valve rod in the closed state can be reduced due to abrasion of the sealing surface, the height of the limit sleeve can be reduced along with the abrasion of the valve rod, the preset clearance is gradually reduced until the preset clearance reaches 0, the abrasion of the sealing surface is very serious, and the condition that the valve has no residual life is judged; therefore, the residual service life of the sealing surface can be judged through the limiting sleeve outside the gate valve, the sealing leakage failure caused by excessive abrasion of the sealing surface can be prevented, a sensor with high cost and complex calculation are not required to be added, and the structure is simple and easy to realize.

The utility model is further provided with: the nearest end face below the limiting sleeve is the top face of the nut sleeve, and a locking nut for tightly pressing the hand wheel is arranged on the nut sleeve.

By adopting the further arrangement, the top surface of the nut sleeve is used as a reference, the condition of the existing gate valve is met, the existing gate valve is convenient to refit, and the design is reasonable and effective.

Still further, the present utility model provides: the inner wall of the limit sleeve is connected with the periphery of the extension section through threads.

By adopting the further arrangement, the limiting sleeve can be rotationally adjusted on the extension section so as to adjust the numerical value of the preset gap when the gate valve leaves the factory.

Still further, the present utility model is provided with: the peripheral wall of the limit sleeve is provided with a pin groove in a ring, the extending section is fixedly provided with a pin, and the pin penetrates through the pin groove to form the fixed fit between the limit sleeve and the extending section.

By adopting the above arrangement, the stop collar and the extension section are simply and effectively fixed.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of a portion of a structure according to an embodiment of the present utility model;

FIG. 3 is an exploded view of a portion of the structure of an embodiment of the present utility model;

wherein, 1, valve rod; 2. a hand wheel; 3. a nut sleeve; 11. an extension section; 4. a limit sleeve; 5. presetting a gap; 6. a lock nut; 41. a pin slot; 12. and (5) a pin.

Description of the embodiments

The hard sealing wedge type open-rod gate valve as shown in fig. 1-3 comprises a valve rod 1, a hand wheel 2 and a nut sleeve 3, wherein the nut sleeve 3 is arranged in the hand wheel 2 in a linkage manner, the valve rod 1 penetrates through the nut sleeve 3, the valve rod 1 is connected with the nut sleeve 3 through threads, and the hand wheel 2 can be rotated to drive the valve rod 1 to lift or descend so as to open or close a gate plate. The top end of the valve rod 1 extends upwards to enable the valve rod 1 to be provided with an extension section 11 which penetrates out of the nut sleeve 3 and then is exposed out of the nut sleeve 3, a limiting sleeve 4 is fixedly arranged on the extension section 11, and a preset gap 5 is formed between the bottom surface of the limiting sleeve 4 and the nearest end surface below the limiting sleeve 4. The preset gap 5 is a standard gap value at the initial start of the valve and is considered to have no remaining life of the sealing surface when the preset gap 5 is near or at 0. After the newly produced gate valve is tightly closed, the limit sleeve 4 is arranged, and the preset gap 5 which can be contacted with the nearest end surface when the bottom end surface of the limit sleeve 4 is downward from the limit sleeve is ensured to have a gap value meeting relevant standards, and the gap value is the abrasion allowance of the sealing surface of the gate valve. After the valve is used for a long time, due to the abrasion of the sealing surface between the flashboard and the valve seat, the height of the flashboard and the valve rod 1 in the closed state can be reduced due to the abrasion, and the height of the limiting sleeve 4 can be reduced along with the abrasion, so that the clearance value of the preset clearance 5 is gradually reduced until the clearance value is reduced to or near 0, the limiting sleeve 4 contacts the nearest end surface below the limiting sleeve 4, the abrasion of the sealing surface is considered to be very serious at the moment, the fact that the sealing surface has no residual service life can be judged, and replacement or maintenance is carried out, so that the gate valve is still used in a pipeline after the sealing surface is prevented from being severely abraded.

With the structural condition of current gate valve, through the nearest terminal surface in below of stop collar 4 for the top surface of nut cover 3, install the lock nut 6 of sticiss hand wheel 2 on the nut cover 3, the top surface of lock nut 6 is high unanimous with the top surface of nut cover 3.

The inner wall of the limit sleeve 4 is provided with internal fine threads, the periphery of the extension section 11 is provided with corresponding external threads, and the limit sleeve 4 is connected with the extension section 11 through threads, so that the limit sleeve 4 can be rotatably adjusted to set a preset gap 5 when the gate valve leaves a factory.

The circumferential wall of the limit sleeve 4 is provided with a pin groove 41 in a ring, and the extending section 11 is fixedly provided with a pin 12 arranged along the radial direction of the valve rod 1. After the height position of the limit sleeve 4 is determined, the pin 12 passes through the pin groove 41 to fix the limit sleeve 4 on the extension section 11.

Claims (4)

1. The utility model provides a hard seal wedge formula open-lever gate valve, includes valve rod, hand wheel and nut cover, nut cover linkage is installed in the hand wheel, the valve rod passes in the nut cover and valve rod and nut cover pass through threaded connection, its characterized in that: the top end of the valve rod is provided with an extension section penetrating out of the nut sleeve, a limit sleeve is fixedly arranged on the extension section, and a preset gap is formed between the bottom surface of the limit sleeve and the nearest end surface below the limit sleeve; the preset gap is a standard gap value when the valve is initially started, and is regarded as the sealing surface to have no residual life when the preset gap is close to or 0.

2. The hard seal wedge type rising stem gate valve of claim 1, wherein: the nearest terminal surface in below of stop collar is the top surface of nut cover, install the lock nut of sticiss the hand wheel on the nut cover.

3. The hard seal wedge type rising stem gate valve of claim 1 or 2, wherein: the inner wall of the limit sleeve is connected with the periphery of the extension section through threads.

4. The hard seal wedge type rising stem gate valve of claim 1 or 2, wherein: the limiting sleeve is characterized in that a pin groove is formed in the peripheral wall of the limiting sleeve in a surrounding mode, a pin is fixedly installed on the extending section, and the pin penetrates through the pin groove to form fixed fit between the limiting sleeve and the extending section.