CN203641546U - Hydraulic drive flat valve - Google Patents
Hydraulic drive flat valve Download PDFInfo
- Publication number
- CN203641546U CN203641546U CN201320738552.3U CN201320738552U CN203641546U CN 203641546 U CN203641546 U CN 203641546U CN 201320738552 U CN201320738552 U CN 201320738552U CN 203641546 U CN203641546 U CN 203641546U
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- CN
- China
- Prior art keywords
- valve
- rod
- valve rod
- piston
- flat valve
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses a hydraulic drive flat valve. A valve rod of the flat valve is in a composite structure. The flat valve comprises the valve rod and a piston rod which are coaxially connected in a threaded fastening manner, wherein the length-diameter ratio of the valve rod is 9.8. According to the flat valve, the valve rod adopts the composite structure, and the original length-diameter ratio of 13.8 is reduced to 9.8, so that the usage cost and the manufacturing cost of materials are reduced and the concentricity of the valve rod is guaranteed; more importantly, a load breakable point is arranged at the joint between the split valve rod and the piston rod, and a connecting point can be broken due to overload once a packing gland and a piston are occluded with the valve rod, so that the safety of the packing gland and the piston in use is guaranteed.
Description
technical field
the utility model relates to petrochemical field, particularly a kind of liquid-operated flat valve.
background technique
on liquid-operated flat valve is widely applied in oil, chemical industry, long-distance transport pipes, oil jetty and tank field, and all under aggressive medium working condition, use.
tradition liquid-operated flat valve is generally made up of parts such as gray iron, valve body, valve gap, piston, piston rod, valve plate, valve seat and wavy springs, wherein cylinder body is fixed on valve body, cylinder cap is installed at top at cylinder body, piston is set in cylinder body, this piston is fixed on the upper end of piston rod, the lower end of piston rod is stretched in the valve pocket of valve body, and is connected with valve plate, and the lower end of valve body is sealed by valve gap.Respectively be provided with a valve seat in the both sides of valve plate, this valve seat is installed in the valve opening of valve body, and is held out against by wavy spring, and the center hole of one of them valve seat communicates with the liquid entering hole on valve body, and the center hole of another valve seat communicates with the liquid outlet on valve body.Described valve body moves up and down with piston rod, makes the control hole on valve plate be communicated with or close with the center hole of two valve seats.Valve rod is wherein the vitals that drives open-shut device to make valve opening and close, in valve opening and closing process, bear draw, pressure and twisting action power, and directly contact with medium, also has relative fricting movement simultaneously and between filler, therefore stem material must guarantee under set point of temperature, have enough intensity and impact toughness, has certain corrosion resistance and resistance to marring, and good manufacturability.
valve rod and the piston rod of tradition liquid-operated flat valve are integrative-structure, be called again connecting rod, it connects respectively packing gland and piston, in actual use, often occurring having between connecting rod and piston the situation of interlock to occur, is that the connecting rod connecting between valve plate and piston is out of shape and causes under the state being stressed mostly.Because valve rod is a slender axles part, its length-to-diameter reaches 13.8, and material hardness can not exceed the requirement of API6A and NACE MR0175, that is to say that the stiffness of connecting rod itself is poor, easily produces distortion under the state being stressed.
and valve rod is slender axles parts, work in-process is difficult to guarantee the requirement of coaxality, and this is also one of reason causing valve rod and packing gland and piston interlock.
model utility content
the drawback existing for above-mentioned conventional art, the utility model is intended to propose a kind of valve rod long service life, liquid-operated flat valve that axle center degree is high.
the utility model is by the following technical solutions: a kind of liquid-operated flat valve, comprise valve body, valve gap, valve plate, valve seat, valve rod, cylinder body, piston and secure component, valve rod is composite structure, comprise valve rod, piston rod, be that concentric screw threads for fastening is connected at valve rod and piston rod, valve rod termination is provided with external screw thread, and piston rod end is provided with built-in screw thread, and be provided with fastening pin-and-hole at the connection end of the two, be fastenedly connected by back-up ring and valve lever pin.
the length of described valve rod and diameter ratio are 9.8.
the utility model beneficial effect is: because valve rod has adopted composite structure, the original length diameter has been reduced to 9.8 than 13.8, user cost and the manufacture cost of material are not only reduced, guarantee the concentricity of liquid-operated flat valve valve rod, the valve rod that main is after split is being provided with the easy breakpoint of load with the connection part of piston rod, once there is scuffing between packing gland and piston and valve rod, first overload breakage of its tie point, thereby guaranteed packing gland and piston, and the safety in utilization of cylinder body.
accompanying drawing explanation
fig. 1 is traditional liquid-operated flat valve structural representation;
fig. 2 is the utility model structural representation;
in its figure: 1-valve gap; 2-valve rod; 3-packing gland; 4-piston; 5-piston rod; 6-back-up ring; 7-valve lever pin.
embodiment
the utility model illustrates specific implementation method using Fig. 2 as most preferred embodiment:
traditional liquid-operated flat valve structural representation shown in Fig. 1, because valve rod 2 length in original technological scheme and diameter ratio are 13.8, stressed easy generation distortion, makes to produce interlock between valve rod 2 and piston 4 or between valve rod 2 and packing gland 3.
consider the deformation effect that valve rod 2 can produce after processing and heat treatment, length and diameter footpath are than larger, deformation meeting is larger, the overall concentricity of valve rod 2 is poorer, the valve rod 2 of tradition liquid-operated flat valve is integrative-structure with piston rod 5, single entire length is long, in the time of gold machining, material is under gravity and radial cutting force effect, easily produce Bending Deformation, thereby can affect the concentricity of valve rod 2 entirety, the utility model has adopted the method for valve rod 2 Split type structures, make valve rod 2 and piston rod 5, under the constant state of total length, length and diameter ratio are reduced to 9.8, valve rod 2 and piston rod 5 after entirety is compound concentricity and bending resistance strengthened, thereby, extend the working life of valve rod 2 and even overall liquid-operated flat valve.
in addition, due to valve rod 2 after the split after improving, be provided with the easy breakpoint of load with the connection part of piston rod 5, once there is scuffing between packing gland 3 and piston 4 and valve rod 2, its tie point first can overload breakage, thereby guaranteed packing gland 3 and piston 4, and the safety in utilization of cylinder body.
the foregoing is only a preferred embodiment of the present utility model; can not limit protection domain of the present utility model with it; the utility model also can have other structural change; as long as the equalization of doing according to protection domain of the present utility model changes and modifies, all should belong in the scope that the utility model contains.
Claims (2)
1. a liquid-operated flat valve, comprise valve body, valve gap, valve plate, valve seat, valve rod, cylinder body, piston and secure component, it is characterized in that described valve rod is composite structure, comprise valve rod, piston rod, be that concentric screw threads for fastening is connected at valve rod and piston rod, valve rod termination is provided with external screw thread, and piston rod end is provided with built-in screw thread, and be provided with fastening pin-and-hole at the connection end of the two, be fastenedly connected by back-up ring and valve lever pin.
2. liquid-operated flat valve according to claim 1, is characterized in that the length of described valve rod and diameter ratio are 9.8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320738552.3U CN203641546U (en) | 2013-11-21 | 2013-11-21 | Hydraulic drive flat valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320738552.3U CN203641546U (en) | 2013-11-21 | 2013-11-21 | Hydraulic drive flat valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203641546U true CN203641546U (en) | 2014-06-11 |
Family
ID=50872791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320738552.3U Expired - Fee Related CN203641546U (en) | 2013-11-21 | 2013-11-21 | Hydraulic drive flat valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203641546U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106639949A (en) * | 2015-10-30 | 2017-05-10 | 上海新莲泵阀有限公司 | Anti-washout geothermal well mouth assembly |
| CN106639951A (en) * | 2015-10-30 | 2017-05-10 | 上海新莲泵阀有限公司 | Geothermal well assembly of the structure of a tube with casing |
-
2013
- 2013-11-21 CN CN201320738552.3U patent/CN203641546U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106639949A (en) * | 2015-10-30 | 2017-05-10 | 上海新莲泵阀有限公司 | Anti-washout geothermal well mouth assembly |
| CN106639951A (en) * | 2015-10-30 | 2017-05-10 | 上海新莲泵阀有限公司 | Geothermal well assembly of the structure of a tube with casing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140611 Termination date: 20201121 |