CN205663900U - Special governing valve of high temperature high pressure - Google Patents

Abstract

The utility model discloses a high-temperature and high-pressure special regulating valve, which comprises a valve body, a valve cover, a valve seat, a valve cage, a valve plug and a valve stem. A valve cover is arranged above the valve body. A built-in space is formed, and a valve seat is provided at the lower part of the built-in space; a valve cage is provided between the valve seat and the bonnet, and the valve cage includes an upper valve cage and a lower valve cage arranged from top to bottom, and the upper valve cage and the lower valve cage There is an upper seal between the cages; there is a valve plug inside the cage, and the valve plug is set above the valve seat, and there is a lower seal between the valve plug and the valve seat; there is a valve stem inside the valve plug, and the valve plug There is a pre-positioning anti-loosening thread connection between the valve stem and the valve stem. The upper part of the valve stem is installed in the center of the bonnet. There is a graphite packing between the valve stem and the bonnet. The high-temperature and high-pressure special regulating valve of the utility model can effectively improve the sealing performance of the valve at high temperature, withstand high pressure, reliability and versatility; it can be widely used in various automatic high-temperature and high-pressure regulating occasions.

Description

A high temperature and high pressure special regulating valve

technical field

The utility model relates to the technical field of automatic control, in particular to a high-temperature and high-pressure special regulating valve capable of controlling flow, temperature and pressure, with good sealing performance, high reliability and durability.

Background technique

In industrial automation control, regulating valves are often used to control flow, temperature and pressure. The structure of the existing regulating valve is shown in Figure 1, which includes a valve body (01), a valve cover (02), a valve seat (03), a valve core (04), a sleeve (05), and a balance sealing ring (06), valve stem (07), packing group (08), gland (09), dust seal (010). Such structures have the following disadvantages:

1. The valve seat (03) and the valve core are sealed in two places, one is a metal seal and the other is a soft seal. Since the soft seal is made of plastic products, its elasticity is poor and it cannot withstand high temperatures. The maximum operating temperature is 200 degrees;

2. The inner wall of the valve core (04) is too thin. When it encounters high temperature, the principle of thermal expansion is easy to deform at high temperature, and it is easy to leak with the metal seal of the bottom valve seat, and it is easy to lock with the sleeve (05), which affects the performance;

3. The balance seal ring (06) is made of functional plastics, which cannot overcome high temperature and particle conditions;

4. After the valve stem (07) and the valve core (04) are connected to the thread, they are welded, which cannot be replaced online, and the maintenance of the equipment is troublesome;

5. The packing group (08) is short in combination, the relative distance of the seal is relatively shortened, and it is far away from the valve core, so it cannot guide the valve core;

6. The gland (09) and valve cover (02) are threaded, which is easy to seize under high-temperature conditions, and cannot achieve the effect of secondary compression and sealing.

In short, as far as the conventional regulating valve at room temperature is concerned, due to insufficient standardization and modularization, its operating temperature is low and the pressure difference is low; The problem of low differential and high friction, and its environmental applicability is not strong, low reliability, and not durable.

To sum up, there is currently a need for a regulating valve that can withstand high temperature and high pressure, has strong environmental applicability, good sealing performance, high reliability, and durability to meet the needs of production and life.

Contents of the invention

The utility model aims at the deficiency of the above-mentioned prior art, and provides a high-temperature and high-pressure special regulating valve, which has a simple structure, good sealing performance in high-temperature and high-pressure environments, high reliability and durability.

In order to solve the problems existing in the prior art, the concrete technical scheme that the utility model adopts is:

A high-temperature and high-pressure special regulating valve, which includes a valve body, a valve cover, a valve seat, a valve cage, a valve plug and a valve stem, and is characterized in that a valve cover is arranged above the valve body, and a valve cover is formed between the valve cover and the valve body A built-in space, a valve seat is provided at the lower part of the built-in space; a valve cage is provided between the valve seat and the valve cover, and the valve cage includes an upper valve cage and a lower valve cage arranged from top to bottom. There is an upper seal between the cage and the lower cage; a valve plug is arranged inside the cage, the valve plug is set on the valve seat, and a lower seal is arranged between the valve plug and the valve seat; the valve There is a valve stem inside the plug. The valve plug and the valve stem are connected by pre-positioning anti-loosening threads. The upper part of the valve stem is installed in the center of the valve cover, and graphite packing is arranged between the valve stem and the valve cover. , The upper part of the valve cover is also provided with a packing gland.

In a preferred solution, the valve cover and the valve body are connected by means of symmetrical bolt compression.

In a further preferred solution, both the upper seal and the lower seal are metal spring energy-storage seal rings made of high-temperature-resistant alloy materials.

In a further preferred solution, the metal spring energy storage sealing ring is provided with a lining spring made of alloy material, and the surface of the lining spring is provided with a wear-resistant coating.

In a still further preferred solution, the valve cover and the packing gland are connected by means of symmetrical bolt compression.

The valve seat is of standardized and modular design, and a groove is arranged in the middle, and the lower seal is arranged in the groove, and the outer edge of the valve plug is sealed between the valve seat and the valve plug through the lower seal.

The inner ring of the valve seat and the lower part of the valve plug are provided with a pair of inclined surfaces in contact with each other, and the inner edge of the valve plug is sealed between the valve seat and the valve plug through the inclined surfaces.

The middle part of the graphite filler is provided with a support sleeve for buffering pressure and reducing friction, and the graphite filler is arranged at the upper and lower ends of the support sleeve. The graphite filler is high-density 304 wound graphite.

The lower valve cage is provided with a plurality of evenly distributed flow holes.

By adopting the above scheme, compared with the prior art, a high-temperature and high-pressure special regulating valve of the present utility model has the following technical effects:

1. The valve body and the bonnet adopt a self-centering snap-in structure, which does not require tooling for disassembly, and is convenient for on-site maintenance and replacement; and the standardized and modular design of the valve seat can improve the versatility of the product.

2. The valve plug and stem are connected by pre-positioning anti-loosening threads. The strength of the valve stem is several times that of conventional regulating valves. It is not easy to bend and is more suitable for severe working conditions.

3. The valve plug and cage can be adapted to different working conditions, with longer service life, higher anti-cavitation and noise reduction performance, only need to replace the cage to be suitable for different working conditions, and the cage Not only does it transmit force to compress the valve seat, but it can also effectively protect the valve body from cavitation and air damage, and has the effect of reducing noise.

4. The stuffing box adopts a compression sealing design, which is safer and more reliable; the stuffing box system adds a support sleeve, which can effectively reduce friction and prevent the stuffing box from locking, and the graphite packing is sealed by contacting the valve stem, which also protects the valve plug. It has a good positioning and guiding effect; the seal of the valve stem is made of high-density 304 winding graphite, which can effectively overcome the influence of high temperature.

5. The principle of double-seal balance is adopted, one is sealed by the combination of the valve plug and the valve seat slope plus the metal spring energy storage sealing ring, and the other is sealed by the metal spring energy storage sealing ring of the valve cage, so that the inner cavity of the regulating valve is balanced. The structure can withstand greater pressure difference. The metal spring energy storage sealing ring is made of special high temperature resistant alloy material, which can maintain normal sealing effect in the temperature range of 920 degrees, and the valve plug and valve seat are sealed at the same angle, which can maintain Long service life and sealing effect.

6. Symmetrical bolt compression is adopted between the packing gland and the bonnet, which prevents the bonnet from being locked.

Description of drawings

Fig. 1 is the overall structure schematic diagram of regulating valve in the prior art;

Figure 2 is a schematic diagram of the overall structure of a high temperature and high pressure special regulating valve of the present invention;

Figure 3 is an enlarged view of part A in the overall structural schematic diagram of a high-temperature and high-pressure special regulating valve of the present invention;

Fig. 4 is an enlarged view of part B in the overall structural schematic diagram of a high-temperature and high-pressure special regulating valve of the present invention;

Fig. 5 is a flow hole arrangement diagram of the lower cage of a high temperature and high pressure special regulating valve of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below in combination with specific examples and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and not intended to limit the scope of the present invention. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessarily confusing the concept of the present invention.

In industrial automation control, it is often necessary to use a regulating valve to control flow, temperature, and pressure; the utility model poppet valve has high sealing performance in high temperature environment, withstands high pressure, and adjustable flow ratio; and because the high temperature and high pressure regulating valve adopts double seal balance One valve bottom is sealed by the combination of the valve plug and the valve seat slope plus the metal spring energy storage sealing ring, and the other is sealed by the metal spring energy storage sealing ring of the valve cage; the metal spring energy storage sealing ring is made of special high temperature resistant Alloy material, can maintain normal sealing effect in the temperature range of 920 degrees. There are precise and uniform regulating flow holes on the cage, and the medium passes through the flow holes to prepare to control the valve characteristics and reduce noise. The sealing of the valve stem is made of high-density 304 winding graphite, which can overcome high temperature.

As shown in FIGS. 2 to 5 , a high-temperature and high-pressure special regulating valve includes a valve body 1 , a valve cover 2 , a valve seat 3 , a valve cage 4 , a valve plug 5 and a valve stem 6 .

A valve cover 2 is provided above the valve body 1, and the valve cover 2 and the valve body 1 are connected by symmetrical bolt compression. The snap-in method is self-centering, no tooling is required for disassembly, and it is convenient for on-site maintenance and replacement.

A built-in space is formed between the valve cover 2 and the valve body 1, and a valve seat 3 is provided at the lower part of the built-in space; a valve cage 4 is provided between the valve seat 3 and the valve cover 2, and the valve cage 4 includes a The upper cage 41 and the lower cage 42 are arranged below, and the surrounding wall of the lower cage 42 is provided with a plurality of evenly distributed flow holes 13, and an upper cage 41 and a lower cage 42 are provided with an upper Seal 7.

The valve cage 4 is provided with a valve plug 5 inside, and the valve plug 5 is arranged on the valve seat 3, and a lower sealing member 8 is arranged between the valve plug 5 and the valve seat 3, and the upper sealing member 7 and the lower sealing member 8 are metal spring energy storage sealing rings made of high temperature resistant alloy materials. The metal spring energy storage sealing rings are provided with lining springs made of alloy materials, and the surface of the lining springs is provided with wear-resistant coatings.

The valve plug 5 is provided with a valve stem 6 inside, and the valve plug 5 and the valve stem 6 are pre-positioned and anti-loose threaded. The upper part of the valve stem 6 is installed in the center of the valve cover 2. A graphite filler 9 is arranged between the rod 6 and the bonnet 2, the middle part of the graphite filler 9 is provided with a support sleeve 10 for buffering pressure and reducing friction, and the graphite filler 9 is arranged at the upper and lower ends of the support sleeve 10, The graphite filler 9 is high-density 304 wound graphite.

The upper part of the valve cover 2 is also provided with a packing gland 11, and the valve cover 2 and the packing gland 11 are connected by symmetrical bolt compression.

The valve seat 3 is of standardized and modular design, and a groove is arranged in the middle, and the lower sealing member 8 is arranged in the groove, and the valve seat 3 and the valve plug 5 are realized through the lower sealing member 8 outside the valve plug. edge seal. The inner ring of the valve seat 3 and the lower part of the valve plug 5 are provided with a pair of inclined surfaces 12 in contact with each other, and the inner edge of the valve plug is sealed by the inclined surfaces 12 between the valve seat 3 and the valve plug 5 .

The valve seat of the high-temperature and high-pressure special regulating valve of the utility model adopts a compact self-centering snap-in structure, which does not require tooling for disassembly, and is convenient for on-site maintenance and replacement; the versatility of the product can be improved after adopting standardized and modular design; the valve plug valve The stem adopts pre-positioning and anti-loosening thread connection; the strength of the ultra-thick valve stem is several times that of conventional control valves, it is not easy to bend, and is more suitable for severe working conditions; the design of the valve plug and cage can adapt to different working conditions and has a longer Service life, higher anti-cavitation and noise reduction performance, only need to replace the valve cage to meet the needs of different working conditions; the stuffing box adopts compression sealing design, which is safer and more reliable; the stuffing box system adds support sleeves, It can effectively reduce friction and prevent stuffing box from locking. The sealing surfaces of the valve plug and seat are sealed at the same angle, which can maintain a long service life and sealing effect. The valve cage not only transmits force to press the valve seat, but also effectively protects the valve body from cavitation and air damage, and has the effect of reducing noise.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the scope of protection of the present utility model. Any modifications and equivalent replacements made within the spirit and principles of the present utility model are included in this utility model. within the scope of protection of utility models.

Claims (10)

1. a High Temperature High Pressure special regulation valve, it includes valve body, valve gap, valve seat, valve cage, valve plug and valve rod, it is characterised in that: Described valve body is arranged over valve gap, forms a built-in space between valve gap and valve body, is provided with valve seat in the bottom of built-in space；Institute Stating and be provided with valve cage between valve seat and valve gap, described valve cage includes upper valve cage and lower valve cage, the described upper valve cage from top to bottom arranged And it is provided with sealing member between lower valve cage；Being provided with valve plug inside described valve cage, valve plug is located on valve seat, and valve plug and valve seat it Between be provided with lower seal；It is provided with valve rod inside described valve plug, is that preposition positioning and locking is threaded between described valve plug and valve rod, Described valve rod top is arranged in bonnet central, is provided with graphite packing between described valve rod and valve gap, and the top of described valve gap also sets There is gland.

A kind of High Temperature High Pressure special regulation valve the most according to claim 1, it is characterised in that: between described valve gap and valve body be Symmetrical bolt presses mode connects.

A kind of High Temperature High Pressure special regulation valve the most according to claim 1, it is characterised in that: described upper sealing member and under close Sealing is the metal spring accumulation of energy sealing ring that High-temperature resistant alloy material makes.

A kind of High Temperature High Pressure special regulation valve the most according to claim 3, it is characterised in that: described metal spring accumulation of energy is close Seal is provided with the inner lining spring using alloy material to make, and described inner lining spring surface is provided with scuff-resistant coating.

A kind of High Temperature High Pressure special regulation valve the most according to claim 1, it is characterised in that: described valve gap and gland Between connect for symmetrical bolt presses mode.

A kind of High Temperature High Pressure special regulation valve the most according to claim 1, it is characterised in that: it is provided with one in the middle of described valve seat Groove, described lower seal is located in groove, is realized the sealing of valve plug outer rim between described valve seat and valve plug by lower seal.

A kind of High Temperature High Pressure special regulation valve the most according to claim 1, it is characterised in that: the inner ring of described valve seat and valve The bottom of plug is equipped with the inclined-plane contacted with each other a pair, realizes the close of valve plug inner edge by described inclined-plane between valve seat and valve plug Envelope.

A kind of High Temperature High Pressure special regulation valve the most according to claim 1, it is characterised in that: the middle part of described graphite packing Being provided with for compensator or trimmer pressure and reduce the support set rubbed, the two ends up and down of support set are located in described graphite packing.

A kind of High Temperature High Pressure special regulation valve the most according to claim 1, it is characterised in that: described graphite packing is highly dense 304 winding graphite of degree.

A kind of High Temperature High Pressure special regulation valve the most according to claim 1, it is characterised in that: described lower valve cage is provided with Multiple equally distributed metering orifices.