CN2354001Y - Leakage-free valve - Google Patents

Abstract

The utility model relates to a leakage-free valve which adopts a new structure, a new process and new materials and adopts a sealing structure with automatic positioning and automatic compensation. The leakage-free valve is a valve without inner leakage as well as outer leakage, and overcomes the problems of water escape, overflow, drip, leakage, etc. existing in a pipeline. A valve rod adopts a ball type driving structure so that the leakage-free valve is flexibly and freely turned on, and overcomes a clamping phenomenon. A valve body can be permanently used, and only wearing parts need to be changed, so the utility model not only saves a great amount of expense for units using the leakage-free valve, but also avoids the renovation of an old valve resulting in harm and has good social and economic benefit.

Description

Leakage-free valve

The utility model belongs to the design of a kind of employing brand new, uses that new process, new method, new material make that valve mechanism more becomes rationally, more reliable performance, more convenient, the simpler leakage-free valve of maintenance of use.

The run, drip, leak of valve are permanent unresolved hard nut to cracks.Both be stainless valve, also because of its in the corrosion rate of most of aggressive mediums such as hydrochloric acid, sulfuric acid, phosphoric acid greater than 1.5mm/, use the several months just to leak.Minority enterprise can only rely on improves the working life that machining accuracy prolongs valve.But most of enterprises (individuality, small towns) technical merit is limited, adds to manufacture in a rough and slipshod way and renovate valve, has aggravated the leakage of valve especially, causes immeasurable loss for enterprise and country.In addition, valve often can't use because of corrosion is stuck.Filler was easy to wear when the sealing of general valve only depended on compressing of the interior packing filling of stuffing box to prevent leakage, work, thereby caused leaking outside of valve; Filler needs often replacing and has increased the time of delaying work and maintenance load.The flap of general valve and the sealing of valve seat are the purposes that reaches fitted seal by rotatablely moving of flap, the main cause that causes valves leakage has: the one, and the gap of feed screw nut, the 2nd, the deviation that the wearing and tearing of workpiece cause, the 3rd, the existence of assembly error, three's accumulated error increase can cause that the off-centre of flap causes the interior leakage of valve.Aggressive medium has aggravated the interior leakage of valve especially to the corrosion of valve seat.

The disclosed purpose of the utility model provides automatically location of a kind of employing, the automatic compensation sealing structure, effected a radical cure valve in let out; Adopt the novel packing material and the two way sealed of elastic element, effected a radical cure leaking of valve; Become valve rod rotation transmission and be linear transmission pair, frictional force is reduced greatly, make its performance more reliable; Adopt the ball bearing structure, make unlatching nimbly and freely, overcome the corrosion stuck phenomenon; Adopt combination secondary two way sealed structure, make and improve 2～3 times its working life, its effect of centering high pressure valve is more remarkable.Brand-new process structure is adopted in this design consideration standardization, seriation, unitized requirement, has improved the interchangeability of product, changes fast, keep in repair easyly, has reduced delaying work the time of replacing valve, has reduced labor intensity; The Leakless valve that connects with the special process of elastic elements such as book wall bellows.

Leakage-free valve has kept the form structure of general valve substantially, and inner brand-new structure and the technology of having adopted.Leakage-free valve is mainly by elastic compensating seal bellows assembly, and its function is that medium and valve rod and upper valve body are completely cut off; Being connected of flap and valve rod adopt ball to connect to realize self-alignment, the straight line motion of realizing valve rod that is connected of valve rod and positioning key, the Location accuracy of raising flap has prevented interior leakage.To most of aggressive medium valves, except that valve body adopted stainless steel, other workpiece all adopted the nickel phosphor alloy chemical plating can improve valve 5-100 in working life doubly.For example corrosion rate is all greater than 1.5m/ in phosphoric acid, hydrochloric acid and sodium hydroxide for stainless steel, and the corrosion rate behind the nickel phosphor plating was respectively 0.0424～O.185mm/ year.(data area is different acid concentrations, the corrosion rate during different temperatures 0.0385～1.001mm/ is with 0.0141～0.266mm/.

Accompanying drawing 1 is the leakage-free valve structural representation, wherein:

1-nut 2-bearing is pressed and is pulled

3-bearing support 4-upper valve body

5-swivel nut 6-bearing dish

7-ball 8-screw

9-guiding pressing plate 10-valve rod

11-nut 12-packing gland

13-T shape bolt 14-seal ring

L5-bolt 16-sealing gasket

17-upper flange plate 18-bellows

Valve body under the 19-lower flange 20-

21-bolt 22-sealing gasket

23-seal ring 24-valve seat

25-pressing plate 26-bolt

27-flap 28-ball

29-nut 30-pad

31-bolt 32-packing seat

33-packing 34-feather key

35-positioning block 36-handwheel

The 37-packing ring

Fig. 2 is the A-A place cross-sectional schematic of Fig. 1, wherein:

The 8-screw 9-pressing plate that leads

10-valve rod 34-feather key

The 35-positioning block

With reference to the accompanying drawings, the working mechanism of elaboration the utility model leakage-free valve is as follows:

The utility model leakage-free valve is mainly by metal or nonmetal bellows 18, upper flange 17, bellows component that lower flange 19 is formed has completely cut off contacting of medium and valve rod and upper valve body, thoroughly effected a radical cure leaking outside of valve, 33 of filler packings play auxiliary prevention, need only bellows and do not deteriorate, and can guarantee not have forever to leak outside, in case bellows deteriorates, packing still can be realized the effect of leakproof like that as valve.The diameter of bellows, the pitch of waves, wall thickness, length etc. can be chosen suitable parameter according to the specification of valve.Bellows with can adopt being connected of upper and lower flange the welding or technique for sticking.

Valve rod 10 adopts ball to realize that its major function is to make flap reach self-alignment with being connected of flap 27.And bellows component also plays auxiliary centering effect, makes the centering precision of flap higher through the secondary self-alignment, has strengthened the sealability of flap and valve seat, has really realized the valve non-internal leakage of determining.Deposit the dimensioned one all arc groove of the bottom of valve rod by ball 28, the ball of packing into from the hole of flap 27 1 sides during assembling is promptly finished being connected of flap 27 and valve rod 10 after bellows component installed.When processing 90 ° of cone angles of seal ring 23, should be with seal ring 23, flap 27 can be processed after pressing plate 25 usefulness bolts 21 assemble, to guarantee its concentricity.

The top of valve rod 10 processes the guiding keyway of symmetry, the motion that becomes valve rod through feather key 36 (Fig. 2) is straight line motion, the frictional force between valve rod 10 and packing and the wearing and tearing of packing 33 have not only been reduced, and fixed the relative position of flap 27 and valve seat 23, improved sealability, reduced to have prolonged the working life of valve because of valve rod 10 rotates the wearing and tearing that cause.During work, rotate handwheel 37 driven rotary nuts 5 and rotate, then valve rod 10 only can be done the between centers straight reciprocating motion at the effect lower valve rod of feather key.Feather key 36 is to be pressed on the valve rod 10 by two guide plates, 9 usefulness screws 8, and the guiding pressing plate is issued to state of rest in the effect of positioning block 35.

For handwheel 38 and swivel nut 5 are rotated nimbly and freely, adopted ball bearing structure, the lower bearing that upper bearing (metal) of being made up of bearing plate 2 and bearing support 3 between handwheel and swivel nut and swivel nut 5 lower ends and bearing dish 6 are formed forms transmission, not only reduce frictional force, and prevented the generation of corrosion stuck phenomenon.

To the high pressure stainless valve, when working medium was the tartaric acid, sulphurous acid of nitric acid, fluidized state and hydrochloric acid, all metalworks of valve were all selected the stainless steel manufacturing for use; When working medium is other media,, after all can selecting for use carbon steel to process, other members carry out the technology manufacturing of ni-p electroless plating except that upper valve body 4 and following valve body 20 are selected for use the stainless steel.Workpiece surface after nickel phosphor plating is handled forms the Ni-P alloy-layer, and the adhesion of coating on workpiece can reach 300～400MPa, and tensile strength has good wear resistance greater than 700MPa; Because coating belongs to the single uniform formation of amorphous state, be difficult for forming galvanic corrosion, has very high corrosion resistance, as mentioned before, the rate of corrosion of nickel phosphor plating surface in most aggressive mediums is significantly less than stainless steel, is 0.0141mm/ in the corrosion rate of 40% hydrofluoric acid, and stainless steel corrosion rate at this moment is greater than 1.5mm/, its anti-corrosion time is surplus in the of stainless 100 times, selects for use nickel phosphor plating not only to save precious metal, and key is the working life that has prolonged valve.

The utility model leakage-free valve has only been set up part and processing and has been strengthened new process in inside, do not change the overall structure of valve, meets the designing requirement of standardization, generalization, seriation.

The utility model leakage-free valve has thoroughly effected a radical cure this chronic disease of run, drip, leak that valve causes because of internal and outernal leakage, and has prolonged the working life of valve, is energy-conservation Updated product, in case promote the use of, economic benefit and social benefit are all good.

Claims (4)

1, a kind of nothing is revealed valve, handwheel, swivel nut, valve rod, feather key, packing seat, bellows component, flap connection successively in valve body, it is characterized in that: swivel nut is connected with valve rod, and valve rod and feather key are slidingly connected, and bellows component is connected with flap.

2, according to right 1 described leakage-free valve, it is characterized in that: valve rod adopts ball to realize with being connected of flap.Its major function is to make flap reach self-alignment.

3, according to right 1 described leakage-free valve, it is characterized in that: form transmission by upper bearing (metal) and lower bearing between handwheel and swivel nut and be connected.

4, according to right 1 described leakage-free valve, it is characterized in that when the working medium of valve is Korrosionsmedium, except that valve body, after all can selecting for use carbon steel to process, other members carry out the technology manufacturing of ni-p electroless plating.

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