Hidden spherical sealing anti-scouring drain stop valve

Abstract

The invention belongs to the technical field of drain stop valves, and discloses a hidden spherical sealing anti-scouring drain stop valve which is characterized in that an outer ring of a valve seat is thin, an inner ring of the valve seat is thick, the valve seat is gradually increased in a step shape to form three steps, a first-step seat, a second-step seat and a third-step seat are sequentially arranged from low to high, the bottom end of an anti-scouring sleeve is pressed on the first-step seat, and the periphery of the bottom surface of a valve clack downwards forms an annular bulge; the center of the bottom face of the valve clack downwards forms a ball protrusion. When the valve is in a closed state, the annular protrusion is pressed on the second-step seat, and the ball protrusion is pressed on the inner edge of the third-step seat. By means of the special structure of the spherical sealing valve clack, the annular protrusion on the periphery of the valve clack protects the sealing face of the valve clack, when the valve clack is opened, fluid is prevented from directly washing the sealing face of the valve clack, and when the valve is closed, the sealing face of the valve clack and the valve seat is covered by the annular protrusion through close fit of the spherical protrusion of the valve clack and the valve seat. And a high-pressure-difference and high-flow-rate medium is prevented from directly and seriously washing a sealing surface for a long time, the service life of a product is prolonged, and the use cost of a user is reduced to the maximum extent.

Description

Technical Field

[0001] The invention belongs to the technical field of hydrophobic stop valves, and in particular relates to a hidden spherical sealing anti-scouring hydrophobic stop valve. Background Art

[0002] Steam traps, also known as steam traps, are valves used in steam pipelines. Their basic function is to discharge condensed water, air and carbon dioxide gas in the steam system as quickly as possible; at the same time, they automatically prevent steam leakage to the maximum extent. There are many types of steam traps, each with different performances. Traditional steam traps are slow to move, the valve trim is severely eroded, and the service life is short. Imported valves are expensive and have high maintenance costs. In order to adapt to various complex working conditions and to meet the high pressure difference working conditions at the same time, conventional steam traps are used as such during operation. The valve trim is quickly damaged by cavitation, flash, evaporation, vibration and other unstable factors after being eroded by the medium in a short time. Therefore, they are forced to stop work and production during maintenance and replacement, resulting in greater economic losses. Summary of the invention

[0003] In order to overcome the above technical problems, the present invention provides a hidden spherical sealing anti-scour steam trap stop valve to ensure the sealing effect and extend the service life of the steam trap.

[0004] The present invention adopts the following technical solutions:

[0005] Hidden spherical seal anti-scour hydrophobic stop valve, the valve disc adopts a high-walled hidden spherical seal multi-layer anti-scour structure to prevent the spherical seal valve disc and spherical seal valve seat seal with a pressure-reducing porous sleeve to avoid direct and serious scour. It includes a valve body, a valve cavity inside the valve body, a liquid inlet channel on one side of the valve cavity, and a liquid outlet channel at the bottom of the valve cavity. A vertical anti-scour sleeve is also arranged in the valve cavity, and a plurality of circular holes are provided on the bottom end wall of the anti-scour sleeve. A valve seat is sandwiched between the bottom end of the anti-scour sleeve and the entrance of the liquid outlet channel. A valve disc is arranged above the valve seat and inside the anti-scour sleeve, and a valve stem is connected above the valve disc. The outer ring of the valve seat is thin and the inner ring is thick, and there are three steps in a stepped manner, from low to high, namely, a first-step seat, a second-step seat, and a third-step seat. The bottom end of the anti-scour sleeve is pressed on the first-step seat, and an annular convexity is formed downward on the outer periphery of the bottom surface of the valve disc, and a spherical convexity is formed downward on the center of the bottom surface of the valve disc; when the valve is closed, the annular convexity is pressed on the second-step seat, and the spherical convexity is pressed on the inner edge of the third-step seat; the bottom end of the valve seat is connected to the pressure reducing sleeve, and the pressure reducing sleeve is in the shape of a cylinder with a sealed bottom, and the side wall of the cylinder is porous.

[0006] Preferred: The valve disc adopts a high-walled hidden spherical seal multi-layer anti-scouring structure to prevent the spherical seal valve disc spherical seal valve seat seal with a pressure-reducing porous sleeve to avoid direct and severe scouring.

[0007] Preferably, the inner edge of the three-step seat is provided with a chamfer, and when the valve is closed, the chamfer cooperates with the ball protrusion to form a seal.

[0008] Preferably, the inner and outer diameters of the annular protrusion are consistent with the inner and outer diameters of the top surface of the second-stage seat.

[0009] Preferably, the central angle of the spherical projection is 120°, the included angle of the chamfers on both sides of the three-step seat is 60°, and in the closed valve state, the edge of the spherical projection fits with the chamfered portion, and the flat section fits with the top surface of the three-step seat.

[0010] Preferably, a clamping nut is arranged above the anti-scour sleeve, the clamping nut is sleeved on the valve stem, a pressure cap is arranged above the clamping nut, a gasket is arranged between the clamping nut and the pressure cap, and a sealing ring is arranged between the pressure cap and the valve body; the pressure cap is sleeved on the valve stem, and packing is filled between the pressure cap and the valve stem, a packing pressure sleeve is arranged above the packing, a packing pressure plate is arranged above the packing pressure sleeve, and the packing pressure plate is connected to the pressure cap by bolts; the pressure cap is connected to the valve body by bolts, and the valve stem and the pressure cap are vertically slidably connected; a connecting plate is arranged above the valve body, and the connecting plate is connected to the valve body by bolts: a through hole is opened in the middle of the connecting plate, the upper end of the valve stem passes through the through hole, the upper end of the valve stem is connected to the connecting plate by the valve stem nut, a thrust ball bearing is arranged between the valve stem nut and the connecting plate, and a handwheel is bolted after the upper end of the valve stem nut exceeds the connecting plate.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The present invention adopts the special structure of the spherical sealing valve disc, and the annular convexity on the outer periphery of the valve disc protects the valve disc sealing surface. When the valve disc is opened, the fluid is prevented from directly scouring the valve disc sealing surface. When the valve is closed, the valve disc spherical convexity and the valve seat are closely matched, and the annular convexity covers the sealing surfaces of the valve disc and the valve seat, thereby preventing the high pressure difference and high flow rate medium from directly and seriously scouring the sealing surface for a long time. The structural design is reasonable, the rationality of the structure of the internal components of the hydrophobic stop valve is improved, the service life of the product is extended, the user's use cost is reduced to the maximum, and the shutdown due to serious damage to the hydrophobic stop valve is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall longitudinal section of the present invention;

[0014] Figure 2 It is a schematic diagram of the longitudinal section of the anti-scour sleeve, valve disc and valve seat.

[0015] Description of reference numerals:

[0016] 1 valve body; 2 liquid inlet channel; 3 liquid outlet channel; 4 valve seat; 5 valve disc; 6 anti-scour sleeve; 7 clamping nut; 8 gland; 9 packing; 10 packing gland; 11 packing pressure plate; 12 connecting plate; 13 valve stem nut; 14 handwheel; 15 valve stem; 16 pressure reducing sleeve. DETAILED DESCRIPTION

[0017] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. Unless otherwise specified, the raw materials and equipment used can be purchased from the market or are commonly used in the art. The methods in the embodiments are conventional methods in the art unless otherwise specified. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0018] The hidden spherical sealing anti-scouring hydrophobic stop valve comprises a valve body 1, a valve cavity is inside the valve body 1, a liquid inlet channel 2 is formed on one side of the valve cavity, a liquid outlet channel 3 is formed on the bottom of the valve cavity, a vertical anti-scouring sleeve 6 is also arranged in the valve cavity, a plurality of circular holes are provided on the bottom wall of the anti-scouring sleeve 6, a valve seat 4 is sandwiched between the bottom end of the anti-scouring sleeve 6 and the entrance of the liquid outlet channel 3, a pressure reducing sleeve 16 is connected to the bottom end of the valve seat 4, the pressure reducing sleeve 16 is in the shape of a bottom-sealed cylinder, and the side wall of the cylinder is porous, a valve disc 5 is arranged above the valve seat 4 and inside the anti-scouring sleeve 6, a valve stem 15 is connected above the valve disc 5, a clamping nut 7 is arranged above the anti-scouring sleeve 6, the clamping nut 7 is sleeved on the valve stem 15, a pressure cap 8 is arranged above the clamping nut 7, and a gasket is arranged between the clamping nut 7 and the pressure cap 8, A sealing ring is provided between the gland 8 and the valve body 1; the gland 8 is sleeved on the valve stem 15, and a packing 9 is filled between the gland 8 and the valve stem 15, a packing gland 10 is provided above the packing 9, a packing pressure plate 11 is provided above the packing gland 10, and the packing pressure plate 11 is connected to the gland 8 by bolts; the gland 8 is connected to the valve body 1 by bolts, and the valve stem 15 is vertically slidably connected to the gland 8; a connecting plate 12 is provided above the valve body 1, and the connecting plate 12 is connected to the valve body 1 by bolts: a through hole is opened in the middle of the connecting plate 12, and the upper end of the valve stem 15 passes through the through hole, and the upper end of the valve stem 15 is connected to the connecting plate 12 through a stem nut 13, and a thrust ball bearing is provided between the stem nut 13 and the connecting plate 12, and the upper end of the stem nut 13 exceeds the connecting plate 12 and is bolted to a handwheel 14.

[0019] The outer ring of the valve seat 4 is thin and the inner ring is thick, and the valve seat 4 is stepped and increases in three steps, from low to high, they are the first-step seat, the second-step seat, and the third-step seat. The bottom end of the anti-scouring sleeve 6 is pressed on the first-step seat, the outer periphery of the bottom surface of the valve disc 5 forms a ring convex downward, and the center of the bottom surface of the valve disc 5 forms a ball convex downward; when the valve is closed, the ring convex is pressed on the second-step seat, and the ball convex is pressed on the inner edge of the third-step seat; the inner edge of the third-step seat is chamfered, and the chamfer cooperates with the ball convex to form a closure when the valve is closed. The inner and outer diameters of the ring convex are consistent with the inner and outer diameters of the top surface of the second-step seat; the center angle of the ball convex is 120°, and the angle of the chamfers on both sides of the third-step seat is 60°. When the valve is closed, the edge of the ball convex fits the chamfered part, and the flat section fits the top surface of the third-step seat.

[0020] Hidden spherical seal anti-scour drain stop valve, when in use:

[0021] Rotating the handwheel 14 drives the valve stem nut 13 to rotate, and the thread drives the valve stem 15 to rise and fall, and the valve stem 15 drives the valve disc 5 to rise and fall to control the opening and closing of the valve; when opening, the ring convex replaces the sealing surface of the valve disc 5 to meet the direct scouring of the fluid entering the anti-scouring sleeve 6; after closing, the ball convex and the chamfered part of the three-step seat are fitted and plugged, and the flat section between the ball convex and the ring convex is fitted with the top surface of the three-step seat to ensure the sealing effect. The ring convex and the three-step seat jointly form a protective layer for the sealing surface to prevent the fluid from stamping and scouring to damage the sealing surface.

[0022] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the above embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A hidden spherical seal anti-scour hydrophobic stop valve, comprising a valve body, a valve cavity inside the valve body, a liquid inlet channel on one side of the valve cavity, a liquid outlet channel at the bottom of the valve cavity, a vertical anti-scour sleeve in the valve cavity, a plurality of circular holes in the bottom wall of the anti-scour sleeve, a valve seat sandwiched between the bottom end of the anti-scour sleeve and the inlet of the liquid outlet channel, a valve disc above the valve seat and inside the anti-scour sleeve, a valve stem connected above the valve disc, characterized in that: The outer ring of the valve seat is thin and the inner ring is thick, and it is stepped in three steps, from low to high, they are first-step seat, second-step seat, and third-step seat. The bottom end of the anti-scour sleeve is pressed on the first-step seat, the outer periphery of the bottom surface of the valve disc forms a ring convex downward, and the center of the bottom surface of the valve disc forms a ball convex downward; when the valve is closed, the ring convex is pressed on the second-step seat, and the ball convex is pressed on the inner edge of the third-step seat; the bottom end of the valve seat is connected to the pressure reducing sleeve, which is in the shape of a cylinder with a sealed bottom, and the side wall of the cylinder is porous.

2. The hidden spherical sealing anti-scouring drain stop valve according to claim 1 is characterized in that: The inner edge of the three-step seat is chamfered, and the chamfer cooperates with the ball protrusion to form a seal when the valve is closed.

3. The hidden spherical sealing anti-scouring drain stop valve according to claim 1 is characterized in that: The inner and outer diameters of the annular convexity are consistent with the inner and outer diameters of the top surface of the second-order seat.

4. The hidden spherical sealing anti-scouring drain stop valve according to claim 2 is characterized in that: The central angle of the ball convex is 120°, and the included angle of the chamfers on both sides of the three-step seat is 60°. In the closed valve state, the edge of the ball convex fits with the chamfered part, and the flat section fits with the top surface of the three-step seat.

5. The hidden spherical sealing anti-scouring drain stop valve according to claim 1 is characterized in that: A clamping nut is arranged above the anti-scour sleeve, the clamping nut is sleeved on the valve stem, a gland is arranged above the clamping nut, a gasket is arranged between the clamping nut and the gland, and a sealing ring is arranged between the gland and the valve body; the gland is sleeved on the valve stem, and packing is filled between the gland and the valve stem, a packing gland is arranged above the packing, a packing pressure plate is arranged above the packing gland, and the packing pressure plate is connected to the gland by bolts; the gland is connected to the valve body by bolts, and the valve stem and the gland are vertically slidably connected; a connecting plate is arranged above the valve body, and the connecting plate is connected to the valve body by bolts: a through hole is opened in the middle of the connecting plate, the upper end of the valve stem passes through the through hole, the upper end of the valve stem is connected to the connecting plate by the valve stem nut, a thrust ball bearing is arranged between the valve stem nut and the connecting plate, and the handwheel is bolted after the upper end of the valve stem nut exceeds the connecting plate.

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