A high-performance pressure reducing valve

Abstract

This invention discloses a high-performance pressure reducing valve. A pressure regulating mechanism is provided in the inner cavity of the upper valve cover. A guide sleeve is provided in the upper end hole of the valve body. The upper end of the slide valve is positioned within the guide sleeve. A first horizontal partition wall is provided within the valve cavity. A valve seat sleeve is provided on the inner hole of the first horizontal partition wall. A second horizontal partition wall is provided in the upper section of the inner hole of the valve seat sleeve. An annular cutting edge is provided at the lower end of the central hole of the second horizontal partition wall. A sealing gasket is provided on the slide valve below the annular cutting edge. The annular cutting edge and the sealing gasket form the valve port of the pressure reducing valve. The lower section of the inner hole of the valve seat sleeve is an inverted conical hole. The lower end of the slide valve is screwed to a slide valve head. A radial pressure-sensing hole communicating with the lower cavity of the diaphragm is provided in the cylindrical inner hole of the upper part of the slide valve head. This high-performance pressure reducing valve can significantly reduce throttling losses, keeping the output pressure of the pressure reducing valve essentially at the set value, and greatly improving the flow characteristics of the pressure reducing valve.

Description

Technical Field

[0001] This invention belongs to the field of valve technology, and specifically relates to a high-performance pressure reducing valve. Background Technology

[0002] A pressure reducing valve is a type of valve that reduces high-pressure fluid upstream to the required low pressure downstream, and maintains a relatively constant output pressure even when the input pressure or output flow rate fluctuates. However, with the increase of flow rate, the output pressure of ordinary pressure reducing valves will decrease more significantly, resulting in poor flow characteristics. Especially under conditions of low input pressure and high output flow rate, the high flow velocity at the valve port leads to high energy consumption, causing the output pressure to decrease further, and it may even be impossible to deliver fluid downstream. This is particularly disadvantageous for users downstream of the pipeline network. Summary of the Invention

[0003] The purpose of this invention is to solve the problem that in existing pressure reducing valves, the output pressure decreases significantly as the output flow rate increases, resulting in poor flow characteristics. This is especially true under conditions of low input pressure and high output flow rate, where the high flow velocity at the valve port leads to high energy consumption, causing the output pressure to decrease further, or even making it impossible to deliver fluid downstream. The invention provides a high-performance pressure reducing valve that can significantly reduce throttling losses, keep the output pressure of the pressure reducing valve basically at the set value, and greatly improve the flow characteristics of the pressure reducing valve.

[0004] The technical solution adopted by this invention to solve the above-mentioned technical problems is a high-performance pressure reducing valve, including a valve body. An upper valve cover is provided above the center of the upper end hole of the valve body. An adjusting mechanism consisting of an adjusting screw, an adjusting spring, and a diaphragm is provided in the inner cavity of the upper valve cover. A guide sleeve is provided in the upper end hole of the valve body. The upper end of a slide valve is movably fitted into the inner hole of the guide sleeve. A first horizontal partition wall is provided inside the valve cavity of the valve body. A valve seat sleeve is provided on the inner hole of the first horizontal partition wall. A second horizontal partition wall is provided in the upper section of the inner hole of the valve seat sleeve. An annular cutting edge is provided at the lower end of the center hole of the second horizontal partition wall. A sealing gasket is provided on the slide valve below the shaped cutting edge. A sealing gasket is provided in the annular groove of the sealing gasket. The annular cutting edge and the sealing gasket form the valve port of the pressure reducing valve. The lower section of the inner hole of the valve seat sleeve is an inverted conical hole. The lower end of the slide valve is screwed to the slide valve head. A lower valve cover is provided in the lower end hole of the valve body below the slide valve head. A radial pressure sensing hole communicating with the lower cavity of the diaphragm is provided on the cylinder of the upper part of the slide valve head. When the slide valve rises, the opening of the valve port decreases and the distance between the radial pressure sensing hole and the inner wall of the inverted conical hole increases. When the slide valve falls, the opening of the valve port increases and the distance between the radial pressure sensing hole and the inner wall of the inverted conical hole decreases.

[0005] The valve cavity of this invention has an inverted conical orifice on the fluid flow channel. A pressure-sensing orifice communicating with the lower cavity of the diaphragm is located on the spool valve head at the center of the inverted conical orifice. This pressure-sensing orifice is located in the hydraulic dynamic region. As the spool valve moves up and down, the distance between the generatrix of the inverted conical orifice and the orifice of the pressure-sensing orifice is unequal (changing), meaning the resulting annular cross-sectional area of ​​the flow channel is unequal. When the valve opening is small, the annular cross-sectional area of ​​the flow channel corresponding to the pressure-sensing orifice is large. At this time, the fluid velocity is low, the Venturi effect is weak, and the dynamic pressure at the orifice of the pressure-sensing orifice exerts a small force on the diaphragm. However, when the inlet pressure is low… Furthermore, when the flow rate is high, the valve opening is large, the annular cross-sectional area of ​​the flow channel corresponding to the pressure sensing orifice is small, the fluid velocity is high, and the dynamic pressure at the pressure sensing orifice is low. Since the pressure sensing orifice is connected to the lower cavity of the diaphragm, this low pressure is fed back to the lower cavity of the diaphragm through the pressure sensing orifice, reducing the force acting on the lower part of the diaphragm. Under the push of the pressure regulating spring, the slide valve moves downward, and the valve opening is appropriately increased. This reduces throttling losses, appropriately increases the output pressure, and keeps the fluctuation of the output pressure within a reasonable range, thus improving the flow characteristics of the pressure reducing valve. The pressure regulating principle of the pressure regulating mechanism of this invention is the same as that of an adjustable pressure reducing valve.

[0006] Taking a DN100 water pressure reducing valve as an example, the feasibility of this invention will be analyzed. It is assumed that when the valve opening V is small, the pressure sensing orifice a is located at the position with the larger cross-sectional area of ​​the inverted conical orifice ( Figure 1 At position I-I, the inner diameter of the inverted conical hole is φ125mm, and the diameter of the cylinder with pressure-sensing hole a is φ45mm. Then, the annular cross-sectional area at this location is:

[0007]

[0008] When the input pressure is low (e.g., 0.2 MPa) and the flow rate is high (e.g., 100 m³ / h) 3 When / h), the valve port V opening is at its maximum, assuming that at this time the pressure sensing orifice a is located at the position with the smaller cross-section of the inverted conical orifice ( Figure 1 (At position II-II), the inner diameter of the inverted conical hole at this position is φ95mm. Therefore, the annular cross-sectional area at this location is:

[0009]

[0010] Furthermore, assuming the output pressure P1 = 0.16 MPa and the effective diameter of the diaphragm d0 = φ150 mm, the Bernoulli equations for the two cross sections are listed as follows:

[0011]

[0012] Right now:

[0013]

[0014] In the formula:

[0015] P1: The pressure at the orifice of the pressure-sensing orifice at section I-I. Due to the large annular cross-sectional area and low fluid velocity at this location, P1 is close to the output pressure. P1 = 0.16 MPa = 1.6 × 10⁻⁶ 5 Pa;

[0016] P2: Pressure at the orifice of the pressure-sensing hole at section II-II, unit Pa;

[0017] u1: The fluid velocity at the orifice of the pressure-sensing orifice at section I-I:

[0018]

[0019] u2: The fluid velocity at the orifice of the pressure-sensing hole at section II-II:

[0020]

[0021] ρ: density of the fluid, ρ = 1000 kg / m³ 3 ;

[0022] Substituting the above values ​​into equation (1), we get:

[0023]

[0024] Calculations show that the second position ( Figure 1 The force acting below the diaphragm at position II-II is smaller than that at position I by ΔF.

[0025]

[0026] This force is sufficient to allow the pressure regulating spring to overcome the resistance of the O-ring and other components, pushing the spool valve downwards and appropriately increasing the valve opening. Changing the taper of the inverted conical orifice allows adjustment of the range of output pressure fluctuations.

[0027] Preferably, the inlet and outlet of the pressure reducing valve are located at both ends of the valve body in the horizontal direction and their center lines are on the same straight line. The upper and lower holes of the valve body are on the same straight line as the center lines of the inner holes of the first and second horizontal partitions in the valve cavity, and intersect perpendicularly with the center lines of the inlet and outlet. A sealing gasket is provided between the upper hole and the guide sleeve and the lower hole and the lower valve cover. The inner hole of the first horizontal partition is press-fitted with the slide sleeve. The guide sleeve has a two-stage stepped shape and inner hole, and is positioned on the corresponding shoulder of the upper hole of the valve body by the outer convex ring at the upper end.

[0028] Preferably, the upper section of the valve seat sleeve inner hole is provided with a second horizontal partition wall, the lower end of the center hole of the second horizontal partition wall is provided with an annular cutting edge, a sealing gasket is provided on the slide valve below the annular cutting edge, a sealing gasket is provided in the sealing gasket, the annular cutting edge and the sealing gasket form the valve port of the pressure reducing valve, the lower section of the valve seat sleeve inner hole is an inverted conical hole, and the lower end of the slide valve is screwed to the slide valve head.

[0029] Preferably, the upper end of the slide valve is a piston, which is movably fitted into the small hole of the stepped inner hole of the guide sleeve and is equipped with an O-ring seal. The piston and the middle hole of the stepped inner hole of the guide sleeve form an annular gap. The middle section of the slide valve is a valve stem, with an outer convex ring at the lower end of the valve stem and a stud at the lower end of the valve stem. An axial blind hole is provided in the center of the slide valve, and a radial through hole is provided at an appropriate position on the piston. The radial through hole communicates with the axial blind hole. When the slide valve moves up and down, the radial through hole and the annular gap are always in communication. The diaphragm is fixed to the top of the slide valve by a nut and a pressure plate. The outer edge of the diaphragm is pressed between the lower annular surface of the upper valve cover and the outer convex ring of the guide sleeve by several bolts, and the guide sleeve is pressed against the corresponding inner shoulder of the upper hole of the valve body.

[0030] Preferably, the spool head is stepped in shape, with an internal thread and a blind hole in the central hole of the upper large-diameter cylinder. The internal thread engages with the stud at the lower end of the spool valve, clamping the sealing gasket and sealing gasket seat between the outer convex ring at the lower part of the valve stem and the spool head. The sealing gasket serves as the valve disc of the valve port. The diameter and centerline of the blind hole are consistent with the axial blind hole at the center of the spool valve. The radial pressure sensing hole on the upper cylinder of the spool head communicates with the lower cavity of the diaphragm through the blind hole, the axial blind hole, and the annular gap. The small-diameter shaft at the lower end of the spool head is dynamically fitted in the corresponding hole of the lower valve cover.

[0031] The beneficial effect of this invention is that it effectively solves the problem of existing pressure reducing valves where the output pressure decreases significantly with increasing output flow rate, resulting in poor flow characteristics. This is especially problematic under conditions of low input pressure and high output flow rate, where high flow velocity at the valve orifice leads to high energy consumption, further reducing the output pressure and even preventing downstream fluid delivery. The high-performance pressure reducing valve of this invention can significantly reduce throttling losses, maintaining the output pressure of the pressure reducing valve essentially at the set value, and greatly improving the flow characteristics of the pressure reducing valve. Attached Figure Description

[0032] Figure 1 This is a structural cross-sectional view of the high-performance pressure reducing valve of the present invention;

[0033] Figure 2 This is a partial structural enlarged view of the high-performance pressure reducing valve of the present invention;

[0034] Figure 3 This is a partial structural enlarged view of the high-performance pressure reducing valve of the present invention.

[0035] In the diagram: 1. Valve body, 2. Upper valve cover, 3. Pressure regulating screw, 4. Pressure regulating spring, 5. Diaphragm, 6. Guide sleeve, 7. Spool valve, 8. O-ring, 9. Valve seat sleeve, 10. Sealing gasket, 11. Sealing gasket seat, 12. Spool valve head, 13. Lower valve cover, a. Radial pressure sensing hole, b. Axial blind hole, c. Annular clearance, d. Radial through hole, e. Center hole, f. Inverted conical hole, g. Blind hole, V. Valve port, W1. First horizontal partition wall, W2. Second horizontal partition wall, A. Water inlet, B. Water outlet. Detailed Implementation

[0036] The specific implementation of the technical solution of the present invention will be further described below through examples and in conjunction with the accompanying drawings.

[0037] Example 1

[0038] In such Figure 1 Figure 2 Figure 3 In the illustrated embodiment 1, a high-performance pressure reducing valve includes a valve body 1. An upper valve cover 2 is located above the center of the upper end hole of the valve body 1. The inner cavity of the upper valve cover 2 contains a pressure regulating mechanism consisting of a pressure regulating screw 3, a pressure regulating spring 4, and a diaphragm 5. A guide sleeve 6 is located in the upper end hole of the valve body 1. The upper end of a slide valve 7 is movably fitted into the inner hole of the guide sleeve 6. A first horizontal partition wall W1 is located within the valve cavity of the valve body 1. A valve seat sleeve 9 is located in the inner hole of the first horizontal partition wall W1. A second horizontal partition wall W2 is located in the upper section of the inner hole of the valve seat sleeve 9. An annular cutting edge is located at the lower end of the central hole e of the second horizontal partition wall W2. A sealing edge is located on the slide valve 7 below the annular cutting edge. The seat 11 has a sealing gasket 10 in its annular groove. The annular edge and the sealing gasket 10 together form the valve port V of the pressure reducing valve. The lower section of the inner hole of the valve seat sleeve 9 is an inverted conical hole f. The lower end of the slide valve 7 is screwed to the slide valve head 12. The lower end hole of the valve body 1 below the slide valve head 12 is provided with a lower valve cover 13. A radial pressure sensing hole a is drilled on the cylindrical inner hole of the upper section of the slide valve head 12, which communicates with the lower cavity of the diaphragm 5. When the slide valve 7 rises, the opening of the valve port V decreases, and the distance between the radial pressure sensing hole a and the inner wall of the inverted conical hole f increases. When the slide valve 7 falls, the opening of the valve port V increases, and the distance between the radial pressure sensing hole a and the inner wall of the inverted conical hole f decreases.

[0039] The inlet hole A and outlet hole B of the pressure reducing valve are located at both ends of the valve body 1 in the horizontal direction, and their center lines are on the same straight line. The upper and lower holes of the valve body 1 are on the same straight line as the center lines of the inner holes of the first horizontal partition wall W1 and the second horizontal partition wall W2 in the valve cavity, and intersect perpendicularly with the center lines of the inlet hole A and the outlet hole B. A sealing gasket is provided between the upper hole and the guide sleeve 6 and the lower hole and the lower valve cover 13. The inner hole of the first horizontal partition wall W1 is press-fitted with the slide sleeve 9. The guide sleeve 6 has a two-stage stepped shape and inner hole, and is positioned on the corresponding shoulder of the upper hole of the valve body 1 by the outer convex ring at the upper end.

[0040] The second horizontal partition wall W2 is set in the upper section of the inner hole of the valve seat sleeve 9. The annular cutting edge is set in the lower port of the center hole e of the second horizontal partition wall W2. The inverted conical hole f is set in the lower section of the inner hole of the valve seat sleeve 9. The top of the valve seat sleeve 9 is provided with an external convex ring, which axially positions the valve seat sleeve 9 on the first horizontal partition wall W1.

[0041] The upper end of the slide valve 7 is a piston, which is dynamically fitted into the small hole of the stepped inner hole of the guide sleeve 6 and is equipped with an O-ring seal 8. The piston and the middle hole of the stepped inner hole of the guide sleeve 6 form an annular gap c. The middle section of the slide valve 7 is a valve stem, and the lower part of the valve stem is equipped with an outer convex ring. The lower end of the valve stem is equipped with a stud. The center of the slide valve 7 is equipped with an axial blind hole b. The piston is equipped with a radial through hole d, which communicates with the axial blind hole b. When the slide valve moves up and down, the radial through hole d and the annular gap c are always in communication. The diaphragm 5 is fixed to the top of the slide valve 7 by a nut and a pressure plate. The outer edge of the diaphragm 5 is pressed between the lower annular surface of the upper valve cover 2 and the outer convex ring of the guide sleeve 6 by several screws, and the guide sleeve 6 is pressed against the corresponding inner shoulder of the upper hole of the valve body 1.

[0042] The slide valve head 12 has a stepped shape. The upper large-diameter cylindrical center hole is provided with an internal thread and a blind hole g. The internal thread is screwed into the stud at the lower end of the slide valve 7 and clamps the sealing gasket 10 and the sealing gasket seat 11 between the outer convex ring at the lower part of the valve stem of the slide valve 7 and the slide valve head 12. The sealing gasket 10 is used as the valve disc of the valve port V. The size and center line of the blind hole g are consistent with the axial blind hole b at the center of the slide valve 7. The radial pressure sensing hole a on the upper cylindrical section of the slide valve head 12 is connected to the lower cavity of the diaphragm through the blind hole g, the axial blind hole b, the radial through hole d and the annular gap c. The small-diameter shaft at the lower end of the slide valve head 12 is dynamically fitted in the corresponding hole of the lower valve cover 13.

[0043] The valve cavity of this invention has an inverted conical orifice on the fluid flow channel. A pressure-sensing orifice communicating with the lower cavity of the diaphragm is located on the spool valve head at the center of the inverted conical orifice. This pressure-sensing orifice is located in the hydraulic dynamic region. As the spool valve moves up and down, the distance between the generatrix of the inverted conical orifice and the orifice of the pressure-sensing orifice is unequal, meaning the resulting annular cross-sectional area of ​​the flow channel is unequal. When the flow rate is small and the valve opening is small, the annular cross-sectional area of ​​the flow channel corresponding to the position of the pressure-sensing orifice is large. At this time, the fluid velocity is low, the Venturi effect is weak, and the dynamic pressure at the orifice of the pressure-sensing orifice exerts a small force on the diaphragm. However, when the flow rate is low and the valve opening is small, the dynamic pressure at the orifice of the pressure-sensing orifice exerts a small force on the diaphragm. When the flow rate is high, the valve opening is large, the annular cross-sectional area of ​​the flow channel corresponding to the pressure sensing orifice is small, the fluid velocity is high, and the dynamic pressure at the pressure sensing orifice is low. Since the pressure sensing orifice is connected to the lower chamber of the diaphragm, this low pressure is fed back to the lower chamber of the diaphragm through the pressure sensing orifice, which reduces the force acting on the lower part of the diaphragm. Under the push of the pressure regulating spring, the slide valve moves downward, and the valve opening is also appropriately increased. This reduces throttling losses, appropriately increases the output pressure, keeps the fluctuation of the output pressure within a reasonable range, and improves the flow characteristics of the pressure reducing valve.

Claims

1. A high-performance pressure reducing valve, comprising a valve body (1), characterized in that, The valve body (1) has an upper valve cover (2) above the center of the upper end hole. The upper valve cover (2) has a pressure regulating mechanism consisting of a pressure regulating screw (3), a pressure regulating spring (4) and a diaphragm (5) in its inner cavity. The valve body (1) has a guide sleeve (6) in its upper end hole. The upper end of the slide valve (7) is dynamically fitted in the corresponding inner hole of the guide sleeve (6). The valve cavity of the valve body (1) has a first horizontal partition wall (W1). The inner hole of the first horizontal partition wall has a valve seat sleeve (9). The upper section of the inner hole of the valve seat sleeve (9) has a second horizontal partition wall (W2). The lower end of the center hole (e) of the second horizontal partition wall (W2) has an annular blade edge. The slide valve (7) below the annular blade edge has a sealing gasket seat (11). The annular groove of the sealing gasket seat (11) has a sealing gasket (10). The annular blade edge and the sealing gasket (10) form the valve port (V) of the pressure reducing valve. The lower section of the inner hole of the valve seat sleeve (9) is an inverted conical hole (f); the lower end of the slide valve (7) is screwed to the slide valve head (12), and a lower valve cover (13) is provided in the lower end hole of the valve body (1) below the slide valve head (12); a radial pressure sensing hole (a) communicating with the lower cavity of the diaphragm (5) is drilled on the inner hole of the upper cylindrical section of the slide valve head (12); as the slide valve moves up and down, the area of ​​the annular cross section formed between the slide valve head cross section where the radial pressure sensing hole is located and the inner wall of the inverted conical hole changes.

2. The high-performance pressure reducing valve according to claim 1, characterized in that, The inlet (A) and outlet (B) of the pressure reducing valve are located at both ends of the valve body (1) in the horizontal direction, and their center lines are on the same straight line. The upper and lower holes of the valve body (1) are on the same straight line as the center lines of the inner holes of the first horizontal partition wall (W1) and the second horizontal partition wall (W2) in the valve cavity, and intersect perpendicularly with the center lines of the inlet (A) and the outlet (B). A sealing gasket is provided between the upper hole and the guide sleeve (6) and the lower hole and the lower valve cover (13). The inner hole of the first horizontal partition wall (W1) is press-fitted with the slide sleeve (9). The guide sleeve (6) has a two-stage stepped shape and inner hole, and is positioned on the corresponding shoulder of the upper hole of the valve body (1) by the outer convex ring at the upper end.

3. The high-performance pressure reducing valve according to claim 1, characterized in that, The second horizontal partition wall (W2) is set in the upper section of the inner hole of the valve seat sleeve (9). The annular cutting edge is set at the lower port of the center hole (e) of the second horizontal partition wall (W2). The annular cutting edge serves as the valve seat of the pressure reducing valve port (V). The inverted conical hole (f) is set in the lower section of the inner hole of the valve seat sleeve (9). The top of the valve seat sleeve (9) is provided with an external convex ring, which axially positions the valve seat sleeve (9) on the first horizontal partition wall (W1).

4. The high-performance pressure reducing valve according to claim 1, characterized in that, The upper end of the slide valve (7) is a piston. The piston is dynamically fitted in the small hole of the stepped inner hole of the guide sleeve (6) and is provided with an O-ring seal (8). The piston and the middle hole of the stepped inner hole of the guide sleeve (6) form an annular gap (c). The middle section of the slide valve (7) is a valve stem. The lower part of the valve stem is provided with an external convex ring. The lower end of the slide valve (7) is provided with a stud. The center of the slide valve (7) is provided with an axial blind hole (b). The piston is provided with a radial through hole (d). The radial through hole (d) communicates with the axial blind hole (b). When the slide valve moves up and down, the radial through hole (d) and the annular gap (c) are always in communication.

5. The high-performance pressure reducing valve according to claim 1, characterized in that, The diaphragm (5) is fixed to the top of the slide valve (7) by nuts and pressure plates. The outer edge of the diaphragm (5) is pressed between the lower annular surface of the upper valve cover (2) and the outer convex ring of the guide sleeve (6) by several bolts, and the guide sleeve (6) is pressed on the corresponding inner shoulder of the upper hole of the valve body (1).

6. The high-performance pressure reducing valve according to claim 4, characterized in that, The slide valve head (12) is stepped in shape. The upper large-diameter cylindrical center hole is provided with an internal thread and a blind hole (g). The internal thread is screwed into the stud at the lower end of the slide valve (7) and clamps the sealing gasket (10) and the sealing gasket seat (11) between the outer convex ring at the lower part of the valve stem of the slide valve (7) and the slide valve head (12). The sealing gasket (10) is used as the valve disc of the valve port (V). The size and center line of the blind hole (g) are consistent with the axial blind hole (b) at the center of the slide valve (7). The radial pressure sensing hole (a) on the upper cylindrical section of the slide valve head (12) is connected to the lower cavity of the diaphragm through the blind hole (g), the axial blind hole (b) and the annular gap (c). The small-diameter shaft at the lower end of the slide valve head (12) is dynamically fitted in the corresponding hole of the lower valve cover (13).

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