CN205479402U - High life high pressure isolating valve - Google Patents

Abstract

The utility model discloses a high-life and high-pressure cut-off valve, which comprises a hand wheel, a packing sealing device, a valve cover, a valve rod, a valve body and a valve disc, wherein the valve body is provided with an inlet channel, an internal channel, a valve disc channel and an outlet channel. ; One end of the internal passage is connected to the inlet passage, and the two passages are in an obtuse angle shape, and the other end is connected to the disc passage, and the two passages are on the same axis, wherein the connection between the internal passage and the disc passage is provided with a valve body As for the sealing surface, the end of the disc passage close to the sealing surface of the valve body is connected to the outlet passage, wherein a valve seat is provided at the corner of the sealing surface of the valve body and the internal passage. The flow direction and stroke of this design medium are relatively gentle, and the flow is smooth, so the fluid resistance is small, which can reduce the scouring force on the valve disc and improve the service life of the globe valve.

Description

A high-life and high-pressure globe valve

technical field

The utility model relates to a high-pressure cut-off valve, in particular to a long-life high-pressure cut-off valve.

Background technique

The globe valve is one of the most widely used valves. Its sealing is by applying torque to the valve stem, and the valve stem exerts pressure on the valve disc in the axial direction, so that the sealing surface of the valve disc fits closely with the sealing surface of the valve body, preventing The medium leaks along the gap between the sealing surfaces. Its structure is simple, not only suitable for medium and low pressure, but also suitable for high pressure; its sealing surface is not easy to wear and scratch, and is relatively durable. However, due to the large fluid resistance, the reliability of the seal decreases during long-term operation, and the high-pressure fluid constantly scours the sealing surface, causing wear and deformation of the sealing surface. In addition, impurities and particles in the fluid may gather on the sealing surface, resulting in poor sealing. Reliable, sealing surface wear.

Utility model content

Purpose of the utility model: The utility model discloses a high-life high-pressure stop valve, which can reduce fluid resistance, reduce scouring, reduce the possibility of impurity retention, improve the durability of the valve disc, improve the sealing reliability, and increase the service life of the stop valve the goal of.

Technical solution: In order to achieve the above purpose, the utility model discloses a high-life high-pressure globe valve, which includes a hand wheel, a packing sealing device, a valve cover, a valve stem, a valve body, and a valve disc, wherein the valve body is provided with an inlet passage, an internal Channel, valve disc channel, outlet channel; one end of the internal channel is connected to the inlet channel, and the two channels are in an obtuse angle shape, and the other end is connected to the valve disc channel, and the two channels are on the same axis, wherein the internal channel and the valve disc A sealing surface of the valve body is provided at the junction of the channel, the end of the disc channel close to the sealing surface of the valve body is connected to the outlet channel, and a valve seat is provided at the corner of the sealing surface of the valve body and the internal channel. The flow direction and stroke of this design medium are relatively gentle, and the flow is smooth, so the fluid resistance is small, which can reduce the scouring force on the valve disc, reduce the possibility of impurity retention, and improve the service life of the globe valve.

Further, in the above-mentioned high-life and high-pressure stop valve, the valve flap includes a mounting part, a cut-off part, and a valve flap sealing part, wherein the mounting part is connected to the valve stem, the cut-off part is conical, the valve flap sealing part is spherical and the surface is provided with Disc sealing surface. The spherical design of the sealing part of the disc can evenly disperse the scouring force of the medium to the surroundings, so the anti-scouring force is strong. This design improves the scouring resistance of the disc and also improves the service life of the globe valve.

Further, in the above-mentioned high-life and high-pressure cut-off valve, the outlet passage includes a first outlet passage and a second outlet passage, and the two passages form an obtuse angle, and the second outlet passage and the inlet passage are in the same direction. This design makes the flow path more gentle and reduces fluid resistance. In addition, the pressure loss of the fluid through the shut-off valve is small.

Further, in the above-mentioned high-life and high-pressure stop valve, the sealing surface of the valve body forms an included angle of 45° with the center line of the inlet channel. This design makes the flow path smooth, the medium flows smoothly, the fluid resistance is small, and the erosion and impurity retention are reduced.

Furthermore, in the above-mentioned high-pressure globe valve with high service life, the sealing surface of the disc is in line contact with the valve seat on the sealing surface of the valve body. When the globe valve cuts off the fluid, the conical cut-off part and the valve seat of the valve body are sealed in a line contact manner, that is, the line seal. Compared with the surface seal, the line seal effect is better, and it is more suitable for high pressure between moving parts. Frequent impact action. In addition, it is not easily affected by sundries and solid particles, improving sealing reliability.

Further, in the aforementioned high-life and high-pressure cut-off valve, a disc sealing ring is provided at the joint between the disc sealing part and the shut-off part, and the disc sealing ring is in line contact with the valve seat. This kind of disc is also designed with a sealing ring. As a further interception measure, when the sealing surface of the disc is worn and the work effect is deteriorated, the cooperation between the disc sealing ring and the valve seat can be used to intercept the flow as the first step. Double protection, the disc sealing ring and the valve seat are matched and sealed, the sealing effect is better and the reliability is higher.

Further, in the above-mentioned high-life and high-pressure globe valve, the valve body is made of 304 material, and the sealing surface of the disc is made of 304 cladding STL. This design significantly enhances the wear resistance and erosion resistance of the sealing surface of the valve body and disc.

It can be seen from the above technical solution that the utility model has the following beneficial effects: a high-life high-pressure cut-off valve described in the utility model has a smooth flow path, and is not easily affected by sundries and solid particles when sealing, and can reduce the flow rate of fluid Reduce the possibility of scouring and impurity retention, improve the anti-scouring ability and durability of the disc, improve the sealing reliability, and achieve the purpose of increasing the service life of the globe valve.

Description of drawings

Figure 1 is a cross-sectional structure diagram of a high-life high-pressure stop valve described in the utility model;

Fig. 2 is a detailed cross-sectional structure diagram of a valve disc of a high-life high-pressure stop valve described in the utility model;

In the figure: 1-valve body, 2-disc, 3-inlet channel, 4-internal channel, 5-disc channel, 6-outlet channel, 7-body sealing surface, 8-valve seat, 9-installation part , 10-cut-off part, 11-disc sealing part, 12-disc sealing surface, 13-first outlet channel, 14-second outlet channel, 15-disc sealing ring.

detailed description

Below in conjunction with accompanying drawing, specific embodiment of the utility model is described in detail.

Example

A high-life and high-pressure globe valve of the present utility model, as shown in Figure 1 and Figure 2, includes a hand wheel, a packing sealing device, a valve cover, a valve stem, a valve body 1, and a valve disc 2, wherein the valve body 1 is provided with an inlet Channel 3, internal channel 4, valve disc channel 5, outlet channel 6; valve disc 2 includes installation part 9 connected with valve stem, conical cut-off part 10, valve disc sealing part 11 in hemispherical shape. The inner channel 4 and the valve disc channel 5 are on the same axis and the valve body sealing surface 7 is provided at the joint. The end of the body sealing surface 7 is connected to the outlet channel 6, the outlet channel 6 includes a first outlet channel 13 and a second outlet channel 14, and an obtuse angle is formed between the two channels, and the second outlet channel 14 and the inlet channel 3 are in the same direction . There is a valve seat 8 at the corner of the valve body sealing surface 7 and the internal channel 4, the valve disc sealing surface 12 and the valve seat 8 on the valve body sealing surface 7 are line seals, the valve disc sealing part 11 of the valve disc 2 and the cut-off part The junction of 10 is provided with disc sealing ring 15, and valve disc sealing ring 15 and valve seat 8 are line seals. In addition, the valve body 1 is made of 304 material, and the valve disc sealing surface 12 is made of 304 cladding STL.

When the valve disc 2 is opened and the medium is circulating, the stroke and flow direction of the fluid are horizontal flow, 135° turning, obtuse angle turning, and slightly changing direction to adjust to horizontal flow. The process is gentle and the fluid resistance is small. The backward water outlet direction is consistent with the water inlet direction, and the pressure loss of the fluid passing through the shut-off valve is small. The valve disc sealing part 11 of the valve disc 2 is hemispherical, and its size and shape are suitable for the size and shape of the internal channel 4. The spherical shape has strong tolerance, and the force can be evenly dispersed to the surroundings when any point is subjected to force, so The spherical shape is stronger than any other shape, and can better withstand the scouring force of the fluid; moreover, the disc sealing surface 12 is 304 overlay welding STL, that is, Steyr alloy, which is superhard, scouring-resistant, and corrosion-resistant; in addition, the fluid The stroke is smooth and the resistance is small, so the scouring force on the valve disc sealing surface 12 is also weakened; and this design reduces the possibility of impurity retention, avoiding the wear of impurities and solid particles on the sealing surface; Greatly increased lifespan.

When the disc 2 closes and cuts off the flow, the valve stem pushes the disc 2 to overcome the fluid pressure and move along the disc channel 5 to the inner channel 4 until the disc sealing part 11 enters the inner channel 4, and the disc sealing surface 12 is sealed with the valve body The valve seat 8 on the surface 7 is in a line-tight state in contact and compression. One-piece valve body 1, valve stem and valve disc 2 are integrally processed to make the valve have higher concentricity. The valve stem is made of high-strength steel with high hardness, so that the surfacing alloy valve disc sealing surface 12 has sufficient base metal hardness support. Prevents eggshell phenomenon. In addition, when the valve disc sealing surface 12 is worn and the seal is poor, the valve stem and valve disc 2 can be pushed further, so that the valve disc sealing ring 15 is in contact with the valve seat 8 on the valve body 1 and pressed tightly to form a line seal, which is reliable. Significantly improved.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements can also be made, and these improvements should also be considered It is the protection scope of the utility model.

Claims (7)

1. a high life high-pressure stop valve, is provided with handwheel, stuffing seal, valve gap, valve rod, it is characterised in that: including: valve body (1), flap (2),

Wherein valve body (1) is provided with access road (3), inner passage (4), flap passage (5), exit passageway (6)；

(4) one end, described inner passage and access road (3) connect, and two shapes in obtuse angle between passage, the other end and flap passage (5) connect, and two passage on the same axis, wherein the junction of inner passage (4) and flap passage (5) is provided with valve body sealing surface (7), described flap passage (5) connects near that one end of valve body sealing surface (7) and exit passageway (6), and valve body sealing surface (7) is provided with valve seat (8) with the corner of inner passage (4).

A kind of high life high-pressure stop valve the most according to claim 1, it is characterized in that: described flap (2) includes installation portion (9), cut-off portion (10), flap sealing (11), wherein installation portion (9) and valve rod connect, cut-off portion (10) is in cone, and flap sealing (11) is spherical in shape and surface is provided with valve clack sealing surface (12).

A kind of high life high-pressure stop valve the most according to claim 1, it is characterized in that: described exit passageway (6) includes the first exit passageway (13) and the second exit passageway (14), and two shape, the second exit passageway (14) and access road (3) be in the same direction in obtuse angle between passage.

A kind of high life high-pressure stop valve the most according to claim 1, it is characterised in that: described valve body sealing surface (7) is 45 ° of angles with the centrage of access road (3).

A kind of high life high-pressure stop valve the most according to claim 2, it is characterised in that: described valve clack sealing surface (12) is linear contact lay with the valve seat (8) on valve body sealing surface (7).

A kind of high life high-pressure stop valve the most according to claim 2, it is characterised in that: described flap sealing (11) is provided with valve clack sealing ring (15) with the junction in cut-off portion (10), and valve clack sealing ring (15) and valve seat (8) they are linear contact lay.

A kind of high life high-pressure stop valve the most according to claim 2, it is characterised in that: described valve body (1) is 304 materials, and valve clack sealing surface (12) is 304 to be cladded with built-up welding STL layer.