CN109899529A - Anticorrosive lining safety valve - Google Patents

Abstract

The invention belongs to the pressure system overpressure protection fields under strong corrosive operating condition, specifically disclose a kind of anticorrosive lining safety valve.It includes valve seat, valve body, valve deck and bonnet；Valve rod, adjusting screw and spring are equipped in valve deck, valve rod lower end is equipped with guide sleeve component；Be equipped with Disc holder, flap and bellows component in valve body, the surface of internal cavity of valve seat and valve body is equipped with the backing layer of stratiform, and Disc holder lower surface is equipped with circular groove, be equipped with flap in slot, the lower surface of Disc holder, flap outer suit O-ring seal.The backing layer isolation ferrous metal material of stratiform is directly contacted with strong corrosive medium, solves the problems, such as that safety valve is not corrosion-resistant, so that the corrosion resistance of safety valve greatly improves；Flap design is disc, it is fixed in the groove of Disc holder lower surface, and be set with O-ring seal outside flap by holding screw, metal hard-sealing between flap and valve seat is become elastic soft sealing, to preferably ensure that sealing performance.

Description

Anticorrosive lining safety valve

Technical field

The invention belongs to the pressure system overpressure protection fields under strong corrosive operating condition, and in particular to a kind of safety valve.

Background technique

Safety valve is a kind of special equipment for pressure system overpressure protection, is a kind of automatic valve.Work as system pressure When reaching set-pressure, the fluid of certain load quantity is discharged using the power of medium itself not by any external force for it, It is more than scheduled safety value to prevent pressure in locking system.When pressure recovery is normal, valve will go again closing with prevent medium after Afterflow goes out.

In the very strong industry of some corrosivity, raw material, processing medium and finished product in production process, such as saturated salt Water, moist chlorine, caustic soda, hydrochloric acid, nitric acid and sulfuric acid etc. all have extremely strong chemical corrosivity.Be in electricity, chemical mediator acid, In alkali, salt environment, the corrosion resistance of safety valve is particularly important.General carbon steel safety valve can be corroded quickly, i.e., Make to be stainless steel safety valve, can also be corroded.

Existing safety valve is as shown in Figure 1, its internal structure is followed successively by adjusting screw 11, valve rod 8, spring from top to bottom 10, guide sleeve component 7, bellows component 6, Disc holder 5, flap 4.Adjusting screw 11 is fixed in bonnet 12, and 8 upper end of valve rod is mounted in In adjusting screw 11.10 sets of spring on valve rod 8, between valve rod 8 and adjusting screw 11.Guide sleeve component 7 is fixed on valve deck 9 Between valve body 2.Bellows component set 6 is on guide sleeve component 7, between guide sleeve component 7 and Disc holder 5.8 lower end of valve rod and 5 upper end of Disc holder is in guide sleeve component 7.4 upper surface of flap is circular conical surface, and entire flap 4 is located inside Disc holder 5, Adjusting ring 19 under being installed on the outside of the upper end of valve seat 1, it is by positioning screw 20 that valve body 2 and lower adjusting ring 19 is fixed.On material The special rolling-mill section that the metal parts of all contact mediums all uses the corrosion resistancies such as Hastelloy, monel metal good.Because this Containing a large amount of rare precious metals in a little alloys, these metal resources are limited, expensive, limit special rolling-mill section in safety valve Middle large-scale popularization application.Flap 4 and valve seat 1 are the hard sealing of metal simultaneously, and sealing performance is poor.

Summary of the invention

A kind of the purpose of the present invention is to provide corrosion resistances good, good airproof performance anticorrosive lining safety valve.

Technical scheme is as follows:

A kind of anticorrosive lining safety valve, it includes valve seat, and valve seat is equipped with valve body, and valve body is equipped with valve deck, valve deck It is equipped with bonnet；Valve rod is equipped in the valve deck, valve rod is externally provided with adjusting screw and spring, and the valve rod lower end is equipped with guide sleeve group Part；Disc holder is equipped in the valve body, the lower section of Disc holder is equipped with flap, and Disc holder is externally provided with bellows component, described anti- The upper end of punch plate is connect with valve rod lower end；The surface of internal cavity of the valve seat and valve body is equipped with lining made of nonmetallic materials Layer.

In above-mentioned anticorrosive lining safety valve: the lower surface of the Disc holder is equipped with circular groove, in groove Flap is fixed in circular groove equipped with circular flap, and by holding screw, while in the lower surface of Disc holder, flap Outside be set with O-ring seal.

In above-mentioned anticorrosive lining safety valve: the O-ring seal is made of fluorubber.

In above-mentioned anticorrosive lining safety valve: at the import of the valve body, the outer ledge in exit, being provided with dovetail The outer side surface of slot, on the outside of the valve seat import and itself and valve body junction is provided with dovetail groove.

In above-mentioned anticorrosive lining safety valve: the nonmetallic materials that backing layer is made refer to perfluoroethylene third Alkene.

In above-mentioned anticorrosive lining safety valve: the bellows component includes under bellows top connection, bellows Connector and bellows between the two, the following table face contact of top connection and guide sleeve component, lower contact is connect with Disc holder, and is passed through Gasket seal, bellows-sheathed is outside Disc holder.

In above-mentioned anticorrosive lining safety valve: being fixed with connecting flange on the outside of the valve seat, pass through bolt The lower surface of connecting flange and valve body is fixed.

In above-mentioned anticorrosive lining safety valve: the flap, Disc holder, holding screw and bellows component are all adopted It is made of Hastelloy or monel metal material.

Remarkable result of the invention is: using backing layer made of perfluoroethylene-propylene, and be fitted in valve seat and On the inside of valve body, isolation ferrous metal material is directly contacted with strong corrosive medium, solves the problems, such as that safety valve is not corrosion-resistant, so that The corrosion resistance of safety valve greatly improves；It is simultaneously disc by flap design, it is fixed on recoil by holding screw In the groove of disk lower surface, and O-ring seal made of fluorubber is set with outside flap, by the original gold between flap and valve seat Belong to hard sealing, flexible soft seal is changed into, to preferably ensure that sealing performance；Further, by original valve body It with the thread connecting mode of valve seat, changes into and processes connecting flange outside valve seat, by connecting flange fixed valve body and valve seat, make It obtains connection type not limited by external world's corrosion, preferably ensure that the reliability of component connection.

Detailed description of the invention

Fig. 1 is safety valve schematic diagram in the prior art；

Fig. 2 is anticorrosive lining safety valve schematic diagram of the invention；

In figure: 1. valve seats；2. valve body；3.O type sealing ring；4. flap；5. Disc holder；6. bellows component；7. guide sleeve group Part；8. valve rod；9. valve deck；10. spring；11. adjusting screw；12. bonnet；13. holding screw；14. backing layer；15. dovetail groove； 16. top connection；17. bellows；18. lower contact；19. lower adjusting ring；20. positioning screw；21. connecting flange.

Specific embodiment

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in Fig. 2, being equipped with valve rod 8 in valve deck 9,8 housing of valve rod fills adjusting screw 11, spring 10, under valve rod 8 Hold mounting guide sleeve component 7.Bonnet 12 is installed in 9 upper end of valve deck, the lower end of valve deck 9 is fixedly connected by bolt with entire valve body 2. Valve rod 8 passes through above-mentioned guide sleeve component 7 and connect with Disc holder 5, and the outer sheath of the Disc holder 5 is equipped with bellows component 6.Bellows Component 6 is welded by bellows top connection 16, bellows 17 and bellows lower contact 18.The lower contact 18 and Disc holder 5 are used Screw thread is connected, and leans on gasket seal.

It is machined with circular groove in the lower surface of above-mentioned Disc holder 5, groove center is machined with screw hole, installs in groove There is circular flap 4, which is also machined with hole, flap 4 is fixed in groove by holding screw 13, to make Flap 4 is obtained threadably to fasten with Disc holder 5.O-ring seal is set in the outside of the lower surface of Disc holder 5, flap 4 simultaneously 3.Valve seat 1 is fixedly connected with below the valve body 2.

The upper surface of the valve seat 1 and the following table face contact of Disc holder 5, flap 4 cover on the cavity at 1 center of valve seat Mouthful.When not combining Disc holder 5 with valve seat 1, the lower plane in flap 4 and Disc holder 5 is protruded in the part of O-ring seal 3.When When Disc holder 5 and valve seat 1 are installed, the upper plane contact of the protrusion part of O-ring seal 3 and lining valve seat 1 come complete flap 4 and Sealing between valve seat 1.O-ring seal 3 is easily deformed, and achieves that excellent sealing under the effect of lesser pressure.

The entire valve body 2 is process by carbon steel or stainless steel material, and the surface of internal cavity of valve body 2 is fitted with anticorrosive Nonmetallic materials formed backing layer 14, with prevent corrosive media corrode shell, the material be perfluoroethylene-propylene.It is described The import of valve body 2, at the outer ledge in exit, be provided with dovetail groove 15, erosion-resisting nonmetallic materials are filled in dovetail groove In 15, the backing layer that erosion-resisting nonmetallic materials are formed is fastened on 2 inside of valve body.Above-mentioned bellows component 6 Top connection 16 lower surface and 2 inner cavity upper surface of valve body 14 annular face contacts of backing layer, realize bellows under pressure The sealing of component 6 and valve body 2.

Valve seat 1 is process by carbon steel or stainless steel material, and the appearance of body cavity is entered after surface of internal cavity and installation Backing layer 14 made of erosion-resisting plastics is fitted on face, to prevent corrosive media from corroding shell.In 1 inlet side of valve seat and The outer side surface of itself and 2 junction of valve body is provided with dovetail groove 15, and backing layer is filled in dovetail groove 15, to realize valve seat 1 and lining Being fastenedly connected between inner layer 14.

Flap 4, Disc holder 5, holding screw 13 and the bellows component 6 is all using Hastelloy or Monel Alloy material is made.O-ring seal 3 is made of erosion-resisting material fluorubber.

If be fixedly connected with valve body 2 with valve seat 1 using threaded connection in the prior art, connection screw thread is also easy By dielectric corrosion.In order to prevent this situation, bolt is worn so the present invention is machined with connecting flange 21 in the outside of valve seat 1 The lower surface that connecting flange 21 screws in valve body 2 is crossed, valve seat 1 and valve body 2 is fixed, while making the backing layer 14 of 2 inner cavity of valve body It is squeezed with the backing layer 14 on valve seat 1, so that valve body 2 and valve seat 1 further seal.

When system pressure reaches set-pressure, when safety valve action, medium push dynamic flap 4,3 Disc holder 5 of O-ring, Valve rod 8 is whole to be moved upwards.The fluid of certain load quantity is discharged, between Disc holder 5 and lining valve seat 1 to prevent in locking system Pressure is more than scheduled safety value.When pressure recovery is normal, spring 10 pushes ovable valve stem 8, Disc holder 5, flap 4, O-ring 3 entirety move downward, and safety valve is closed to prevent medium from continuing to flow out, effective protection system safety operation.Corrosion resistant lining formula Safety valve can be used for realizing the overpressure protection of the pressure system under deep-etching operating condition.

Claims (8)

1. a kind of anticorrosive lining safety valve, it includes valve seat (1), and valve seat (1) is equipped with valve body (2), and valve body (2) is equipped with Valve deck (9), valve deck (9) are equipped with bonnet (12)；Valve rod (8) are equipped in the valve deck (9), valve rod (8) is externally provided with adjusting screw 11 and spring (10), valve rod (8) lower end is equipped with guide sleeve component (7)；Disc holder (5) are equipped in the valve body (2), recoil The lower section of disk (5) is equipped with flap (4), and Disc holder (5) is externally provided with bellows component (6), the upper end of the Disc holder (5) and valve rod (8) lower end connects；It is characterized by: the surface of internal cavity of the valve seat (1) and valve body (2) is equipped with lining made of nonmetallic materials Inner layer (14).

2. anticorrosive lining safety valve as described in claim 1, it is characterised in that: the lower surface of the Disc holder (5) Equipped with circular groove, circular flap (4) are equipped in groove, and flap (4) is fixed on circle by holding screw (13) In groove, while O-ring seal (3) are set in the outside of the lower surface of Disc holder (5), flap (4).

3. anticorrosive lining safety valve as claimed in claim 2, it is characterised in that: the O-ring seal (3) is by fluorine rubber Glue is made.

4. the anticorrosive lining safety valve as described in claims 1 or 2 or 3, it is characterised in that: the import of the valve body (2), It at the outer ledge in exit, is provided with dovetail groove (15), the table in valve seat (1) the import outside and itself and valve body (2) junction Dovetail groove (15) are provided on the outside of face.

5. the anticorrosive lining safety valve as described in claims 1 or 2 or 3, it is characterised in that: described is made backing layer (14) nonmetallic materials refer to perfluoroethylene-propylene.

6. the anticorrosive lining safety valve as described in claims 1 or 2 or 3, it is characterised in that: the bellows component It (6) include bellows top connection (16), bellows lower contact (18) and bellows (17) between the two, top connection and guide sleeve group The following table face contact of part (7), lower contact 18 are connect with Disc holder (5), and by gasket seal, bellows (17) is sleeved on recoil Disk (5) is outside.

7. the anticorrosive lining safety valve as described in claims 1 or 2 or 3, it is characterised in that: outside the valve seat (1) Side is fixed with connecting flange (21), and flange (21) is bolted and the lower surface of valve body (2) is fixed.

8. the anticorrosive lining safety valve as described in claims 1 or 2 or 3, it is characterised in that: the flap (4), Disc holder (5), holding screw (13) and bellows component (6) are all made of Hastelloy or monel metal material.