Dual seal stop valve
A shut-off valve and double-seal technology, which is applied in shaft seals, lift valves, valve details, etc., can solve problems such as fluid leakage, rust, and loss of sealing function of PTFE packing, so as to improve working life and reliability, and eliminate The ability of internal leakage and the effect of superior corrosion resistance
Inactive Publication Date: 2013-06-05
北京航科航天石化氟塑泵阀有限公司
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AI Technical Summary
Problems solved by technology
The packing seal is a static seal, and its problems are: 1. The PTFE packing tightly hugs the valve stem under the high pressure of the pressure plate to avoid fluid leakage. With the repeated switching of the valve stem, the wear increases and the pressure plate The tighter the pressure, the tighter the packing will hold the shaft, and the greater the relative wear, just like a car brake pad, a gap will appear between the packing and the valve stem after a long time, and leakage will occur over time
It must be reminded that the PTFE material has cold flow characteristics. After a long time, under the high pressure of the platen, the cold flow characteristics will cause the PTFE packing to lose its sealing function.
In addition, the existing bonnet assembly is a steel bracket structure, which has the following problems. When the valve is opened, the handwheel is rotated, and the valve stem rotates and then moves up and down. When the valve is opened to the maximum position, the valve stem is exposed outside like a giraffe , the valve stem is easily attacked by acid gas, rain, wind and sand, and will rust to death in a short period of time
Method used
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Embodiment Construction
[0025] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0026] refer to figure 1, the preferred embodiment of the double-seal shut-off valve of the present invention includes a valve body 14, a valve stem 11, the valve body has a liner 15, and the upper part of the valve body 14 is sequentially connected with a sealing assembly and an upper cover assembly; in the sealing assembly, the lower It is a packing static seal, and the upper part is a piston dynamic seal. The two seals are arranged in the same sealing seat 7, and the upper part is fixed with a gland 6. The piston 9 is circular and can move up and down between the valve stem 11 and the sealing seat 7. Two annular grooves are processed on the outer circle and the inner hole of the piston ring, and two fluorine rubber O-rings 10 are installed inside, four The O-shaped sealing ring ensures that there will be no leakage betwee...
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The invention provides a dual seal stop valve which comprises a valve body and a valve rod. The valve body is provided with a lining. The upper portion of the valve body is connected with a seal assembly and an upper cover assembly in sequence. The lower portion of the seal assembly is a packing seal and the upper portion of the seal assembly is additionally provided with a piston seal which is arranged in the same seal seat and is fixed by a gland. Due to the fact that structure is changed and the piston seal is added, so that seal effects are greatly enhanced and the valve rod can not be exposed to the outside after the valve is started so as to avoid corrosion, and therefore service life of the stop valve is greatly prolonged and the reliability of the stop valve is greatly improved.
Description
technical field [0001] The invention relates to a shut-off valve with a double sealing structure. Background technique [0002] The modern large-scale petrochemical and heavy chemical production system is a huge and complex system engineering. The entire factory area is covered with densely packed pipelines within tens of square kilometers. There are thousands of various valves installed on the pipelines, including globe valves. Take the chlor-alkali chemical plant as an example. The chemical products flowing in the pipeline are: caustic soda, hydrochloric acid, chlorine gas, hydrogen chloride, salt water, PVC, etc. These are dangerous and harmful substances such as strong acid, strong alkali, and poisonous gas. In severe cases, it will cause personal injury or death. How to avoid environmental pollution and how to ensure the safety and reliability of petrochemical and heavy chemical production are issues that we must pay attention to. [0003] At present, the popular glob...
Claims
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Login to View More IPC IPC(8): F16K41/00F16K27/02F16K1/32
Inventor 张际才
Owner 北京航科航天石化氟塑泵阀有限公司