Non-rotating full penetration welding type ultralow-temperature stop valve

Abstract

The utility model relates to the field of stop valves, in particular to a non-rotating full penetration welding type ultralow-temperature stop valve which comprises a valve body, a first valve rod is arranged at the top end of the valve body, a lower valve cover and an upper valve cover are sequentially arranged at the upper end and the lower end of the outer side of the first valve rod, and filler is arranged at the intersection position of the middle section of the first valve rod and the upper valve cover and located on the inner side of the upper valve cover. Two side ribs of the upper valve cover are used for guiding, the limiting plate, the flat key, the set screw, the first valve rod and the valve rod nut are combined to form a valve rod non-rotating lifting mechanism, a conventional cut-off rotating rod mechanism is replaced, when filler is reversely loosened, the disc spring releases pretightening force, the effect of providing continuous pretightening force is achieved, and the safety of the filler is improved. And in the welding process of the upper valve cover and the lower valve cover, the coaxiality of the upper valve cover and the lower valve cover is achieved in a seam allowance matching mode, then butt welding is conducted, seam allowances of the valve covers are machined and removed after welding, and a complete butt welding groove is formed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of stop valve especially relates to a non-rotating full penetration type ultralow temperature stop valve. BACKGROUND

[0002] The ultralow temperature stop valve is a valve specially used in severe working conditions, usually works in low temperature environment, compared with normal temperature valve, the valve packing position is usually designed to be high, and the valve rod adopts lengthened rod, and in order to prevent deep cold deformation, the main parts of the ultralow temperature stop valve are all subjected to cryogenic treatment, so that the valve can keep opening and closing flexible under ultralow temperature state.

[0003] However, in the process of using the ultralow temperature stop valve, the manual ultralow temperature stop valve is mostly a rotating rod, compared with a non-rotating rod, the sealing performance of the packing is poor, the torque is large, the upper seal is unstable after being used for many times, the welding groove of the lengthened neck of the valve cover is welded, the industry adopts socket welding, the welding safety factor is low, leakage is prone to occur, and the industry mostly does not install pre-tightening load at the packing position, when the packing is loose after being used for a period of time, the packing position is prone to leakage, and the online maintenance under low temperature working condition is not safe.

[0004] Therefore, in view of the problems of the prior art that the manual ultralow temperature stop valve is mostly a rotating rod, compared with a non-rotating rod, the sealing performance of the packing is poor, the torque is large, the upper seal is unstable after being used for many times, the welding groove of the lengthened neck of the valve cover is welded, the industry adopts socket welding, the welding safety factor is low, leakage is prone to occur, and the industry mostly does not install pre-tightening load at the packing position, when the packing is loose after being used for a period of time, the packing position is prone to leakage, and the online maintenance under low temperature working condition is not safe, a non-rotating full penetration type ultralow temperature stop valve is designed, a valve rod non-rotating lifting mechanism formed by the guide, the limiting plate, the flat key, the set screw, the valve rod and the valve rod nut on both sides of the upper valve cover is used to replace the conventional stop rotating rod mechanism, the disc spring releases the pre-tightening force when the packing is loose, the function of providing continuous pre-tightening force is achieved, the risk of packing leakage under low temperature dangerous working condition is avoided, and during the welding process of the upper and lower valve covers, the coaxiality of the upper and lower valve covers is realized by adopting the sub-port matching mode first, then butt welding is carried out, and after welding, the sub-port of the valve cover is removed to form a complete butt welding groove. SUMMARY

[0005] In order to overcome the problems of the prior art that the manual ultralow temperature stop valve is mostly a rotating rod, compared with a non-rotating rod, the sealing performance of the packing is poor, the torque is large, the upper seal is unstable after being used for many times, the welding groove of the lengthened neck of the valve cover is welded, the industry adopts socket welding, the welding safety factor is low, leakage is prone to occur, and the industry mostly does not install pre-tightening load at the packing position, when the packing is loose after being used for a period of time, the packing position is prone to leakage, and the online maintenance under low temperature working condition is not safe.

[0006] The technical scheme of the utility model discloses: a non-rotating full penetration type ultra-low temperature stop valve, including the valve body, the top of valve body is equipped with first valve rod, the upper and lower both ends of first valve rod outside are equipped with lower valve cover and upper valve cover in proper order, the intersection of the middle section of first valve rod and upper valve cover is located the inside of upper valve cover and is equipped with packing, the outer end surface of packing is located the both sides of upper valve cover and is equipped with first nut and slip knot in proper order, the connecting place of first nut and upper valve cover is equipped with disc spring, the bottom of first valve rod extends to the inside of valve body, the top of first valve rod is equipped with hand wheel in the top of upper valve cover.

[0007] Preferably, the valve rod non-rotating lifting mechanism is formed by the guide, the limiting plate, the flat key, the set screw, the valve rod and the valve rod nut, which replaces the conventional rotating rod mechanism of the stop valve, and the disc spring releases the pre-tightening force when the packing is loosened, thereby providing the continuous pre-tightening force, avoiding the risk of packing leakage in the low-temperature dangerous working condition, and in the welding process of the upper valve cover and the lower valve cover, the coaxialities of the upper valve cover and the lower valve cover are realized by adopting the sub-port matching mode, then butt welding is carried out, and the sub-port of the valve cover is removed after welding, thereby forming the complete butt welding bevel.

[0008] Preferably, the outer side of the top of the first valve rod is provided with the limiting plate on the outer end surface of the upper valve cover, one side of the limiting plate is provided with the set screw, and one end of the set screw extends to the outer side of the first valve rod through the limiting plate.

[0009] Preferably, the set screw is provided with the flat key at the intersection with the first valve rod.

[0010] Preferably, the top of the first valve rod extends to the inside of the hand wheel.

[0011] Preferably, the intersection of the hand wheel and the first valve rod is provided with the valve rod nut, and the hand wheel and the first valve rod are connected through the valve rod nut.

[0012] Preferably, the outer side of the lower valve cover is provided with the drip tray, and the intersection of the bottom of the first valve rod and the lower valve cover is provided with the supporting ring on the inner wall of the lower valve cover.

[0013] Preferably, the lower part of the first valve rod is provided with the valve flap on the inside of the valve body, and the bottom of the first valve rod extends to the inside of the valve flap.

[0014] The utility model discloses the beneficial effect:

[0015] The stop valve replaces the conventional stop rotary rod mechanism by the non-rotating lifting mechanism of the valve rod formed by the guide and limiting plate on both sides of the upper valve cover, the flat key, the retaining screw, the first valve rod and the valve rod nut, and provides the continuous pre-tightening force by releasing the pre-tightening force of the disc spring when the packing is loosened, thereby avoiding the risk of packing leakage in the low-temperature dangerous working condition, and the coaxiality of the upper and lower valve covers is realized by the sub-port matching method during the welding of the upper and lower valve covers, then the butt welding is performed, and the sub-port of the valve cover is removed after welding to form the complete butt welding bevel. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The whole structure schematic view of the utility model is shown;

[0017] Figure 2 The whole structure schematic view of the utility model is shown;

[0018] Figure 3 The whole structure schematic view of the utility model is shown;

[0019] Figure 4 The whole structure schematic view of the utility model is shown.

[0020] The reference signs are explained as follows: 1, hand wheel; 2, valve rod nut; 3, retaining screw; 4, flat key; 5, limiting plate; 6, first nut; 7, disc spring; 8, slipknot; 9, packing; 10, first valve rod; 11, drip tray; 12, lower valve cover; 13, support ring; 14, valve clack; 15, valve body; 16, upper valve cover. DETAILED DESCRIPTION

[0021] The utility model will be further explained in combination with the drawings and examples.

[0022] Please refer to Figures 1-4The utility model provides a technical scheme: a non-rotating full penetration type ultralow temperature stop valve, the top of valve body 15 is equipped with first valve rod 10, the upper and lower ends of the outside of first valve rod 10 are equipped with lower valve cover 12 and upper valve cover 16 in proper order, the intersection of the middle segment of first valve rod 10 and upper valve cover 16 is located the inside of upper valve cover 16 and is equipped with packing 9, the outer end surface of packing 9 is located the both sides of upper valve cover 16 and is equipped with first nut 6 and live knot 8 in proper order, the connecting place of first nut 6 and upper valve cover 16 is equipped with disc spring 7, the bottom of first valve rod 10 extends to the inside of valve body 15, the top of first valve rod 10 is located the top of upper valve cover 16 and is equipped with hand wheel 1, the top of first valve rod 10 extends to the inside of hand wheel 1, the intersection of hand wheel 1 and first valve rod 10 is equipped with valve rod nut 2, hand wheel 1 and first valve rod 10 are connected through valve rod nut 2, and then through only relative movement without rotation at the position of packing 9, reduce the frictional resistance and packing 9 wear, to improve the sealing performance of packing 9, reduce the torque, and the upper sealing contact surface is matched from the fixed position to the determined position, and the upper sealing stability is improved.

[0023] Please refer to Figures 2-3 In the embodiment, the outside of the top of first valve rod 10 is located the outer end surface of upper valve cover 16 and is equipped with limit plate 5, one side of limit plate 5 is equipped with tight screw 3, one end of tight screw 3 extends to the outside of first valve rod 10 through limit plate 5, the intersection of tight screw 3 and first valve rod 10 is located one end of first valve rod 10 and is equipped with flat key 4, and then the first valve rod 10 non-rotating lifting mechanism formed by the combination of upper valve cover 16 both sides rib, limit plate 5, flat key 4, tight screw 3, first valve rod 10 and valve rod nut 2 replaces the conventional stop rotating rod mechanism.

[0024] Please refer to Figures 3-4 The outside of lower valve cover 12 is equipped with drip tray 11, the intersection of the bottom of first valve rod 10 and lower valve cover 12 is located the inner wall of lower valve cover 12 and is equipped with support ring 13, the inside of valve body 15 is equipped with valve flap 14 below first valve rod 10, the bottom of first valve rod 10 extends to the inside of valve flap 14, and then lower valve cover 12 is connected with first valve rod 10.

[0025] In the work, by the upper valve cover 16 both sides of the guide, limit plate 5, flat key 4, tight screw 3, the first valve rod 10 and valve rod nut 2 combination formed by the first valve rod 10 non-rotating lifting mechanism, instead of the conventional cut-off rotary rod mechanism, in the packing 9 position only has relative movement without rotation, reduce the friction resistance and packing 9 wear, thereby improving the packing 9 sealing performance, reduce the torque; At the same time, the upper sealing contact surface from the fixed position to the determined position, improve the stability of the upper sealing, and in the upper and lower valve cover welding process, first adopt the way of sub-port matching to realize the coaxial degree of the upper and lower valve cover, then butt welding, after welding, the sub-port of the valve cover is processed to remove, form the complete butt welding groove, avoid the problem that the bottom of the socket welding is easy to appear defect, and each increase a group of disc spring 7 at the live bolt of the packing 9, when the packing 9 is loose, the disc spring 7 releases the pre-tightening force, provides the continuous pre-tightening force, avoids the risk of packing 9 leakage in low temperature dangerous working condition.

[0026] Through the above steps, by the upper valve cover 16 both sides of the guide, limit plate 5, flat key 4, tight screw 3, the first valve rod 10 and valve rod nut 2 combination formed by the first valve rod 10 non-rotating lifting mechanism, instead of the conventional cut-off rotary rod mechanism, and through the disc spring 7 releases the pre-tightening force when the packing 9 is loose, provides the continuous pre-tightening force, avoids the risk of packing 9 leakage in low temperature dangerous working condition, and in the upper and lower valve cover welding process, first adopt the way of sub-port matching to realize the coaxial degree of the upper and lower valve cover, then butt welding, after welding, the sub-port of the valve cover is processed to remove, form the complete butt welding groove, solve the problem that the existing ultra-low temperature cut-off valve is mostly rotary rod, compared with the non-rotary rod, the sealing performance of the packing is poor, the torque is large, the upper sealing is unstable after multiple uses, and the welding groove of the lengthened neck of the valve cover is socket welded, the welding safety factor is low, easy to leak, and the packing is not installed with pre-tightening load in the industry, when the packing is loose after a period of use, the packing position is easy to leak, and the online maintenance is not safe in low temperature working condition.

Claims

1. A non-rotating full-penetration ultra-low temperature globe valve comprising a valve body (15); characterized in that: The top end of the valve body (15) is provided with a first valve rod (10), the upper and lower ends of the outer side of the first valve rod (10) are sequentially provided with a lower valve cover (12) and an upper valve cover (16), the intersection between the middle segment of the first valve rod (10) and the upper valve cover (16) is located on the inner side of the upper valve cover (16) and is provided with a packing (9), the outer end surface of the packing (9) is located on both sides of the upper valve cover (16) and is sequentially provided with a first nut (6) and a live knot (8), the connecting part between the first nut (6) and the upper valve cover (16) is provided with a disc spring (7), the bottom end of the first valve rod (10) extends to the inner side of the valve body (15), and the upper side of the first valve rod (10) is located at the top end of the upper valve cover (16) and is provided with a hand wheel (1).

2. A non-rotating full-penetration ultra-low temperature globe valve according to claim 1, characterized in that: The outer side of the top end of the first valve rod (10) is located on the outer end surface of the upper valve cover (16) and is provided with a limiting plate (5), one side of the limiting plate (5) is provided with a set screw (3), and one end of the set screw (3) extends to the outer side of the first valve rod (10) through the limiting plate (5).

3. A non-rotating full-penetration ultra-low temperature globe valve according to claim 1, wherein: The intersection between the set screw (3) and the first valve rod (10) is located at one end of the first valve rod (10) and is provided with a flat key (4).

4. The non-rotating full-penetration ultra-low temperature globe valve of claim 1, wherein: The top end of the first valve rod (10) extends to the inner side of the hand wheel (1).

5. A non-rotating full-penetration ultra-low temperature globe valve according to claim 1, wherein: The intersection between the hand wheel (1) and the first valve rod (10) is provided with a valve rod nut (2), and the hand wheel (1) and the first valve rod (10) are connected through the valve rod nut (2).

6. A non-rotating full-penetration ultra-low temperature globe valve according to claim 1, wherein: The outer side of the lower valve cover (12) is provided with a drip tray (11), and the intersection between the bottom end of the first valve rod (10) and the lower valve cover (12) is located on the inner wall of the lower valve cover (12) and is provided with a support ring (13).

7. A non-rotating full-penetration ultra-low temperature globe valve according to claim 1, wherein: The lower side of the first valve rod (10) is located on the inner side of the valve body (15) and is provided with a valve clack (14), and the bottom end of the first valve rod (10) extends to the inner side of the valve clack (14).

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