Corrugated pipe fluorine lining regulating valve

Abstract

The utility model discloses a corrugated pipe fluorine lining regulating valve, which relates to the technical field of valves, and comprises a fluorine lining valve body, a polytetrafluoroethylene (PTFE) corrugated pipe, a valve rod and a valve clack, the lower end of the valve rod is connected with the valve clack, the upper end of the valve rod extends upwards out of the fluorine lining valve body, the PTFE corrugated pipe is sleeved on the outer side of the valve rod, a fluorine lining valve cover is arranged above the fluorine lining valve body, and the PTFE corrugated pipe is connected with the valve clack. The upper end of the PTFE corrugated pipe abuts against the fluorine lining valve cover, guide separation protrusions are arranged at the lower end of the valve clack and divide the lower end of the valve clack into a plurality of flow adjusting areas, flow adjusting grooves are formed in the flow adjusting areas and comprise the first flow adjusting groove and the second flow adjusting groove, the length of the first flow adjusting groove is larger than that of the second flow adjusting groove, and the first flow adjusting groove and the second flow adjusting groove are communicated with each other. The first flow adjusting grooves and the second flow adjusting grooves are alternately distributed in the multiple flow adjusting areas in the circumferential direction of the valve clack. The valve rod can be prevented from being eroded by media, reliable operation of the valve is guaranteed, a curve corresponding to flow adjustment is smooth through control of the two-section flow adjusting groove, and flow can be accurately controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and particularly relates to a corrugated pipe lined with fluorine regulating valve. Background Art

[0002] A regulating valve is a device used to change the flow rate of gas or liquid and achieve a certain requirement. It belongs to a precision control instrument and is usually composed of a master device and other accessories. It can achieve the opening and closing action only by receiving the signal from the regulating instrument, so as to achieve the required purpose. In pipelines with various concentrations of sulfuric acid, hydrochloric acid, hydrofluoric acid, aqua regia, various organic acids, strong acids, strong oxidants and other corrosive media, a fluorine-lined regulating valve is usually used as the pipeline valve for regulation. The existing fluorine-lined regulating valves have the following problems: 1. The inner cavity, flow channel, etc. in the valve body are lined with fluoroplastics, but the valve stem is exposed in the medium and is easily eroded, thus affecting the use; 2. The valve flap generally adopts a regulating groove with a single parabolic curved surface shape. By changing the flow area between the regulating groove and the fluorine-lined layer, the purpose of controlling the flow rate is achieved. Under high-pressure working conditions, due to the too fast flow rate of the medium, the end with the parabolic curved surface is easily eroded and damaged, affecting the regulating effect. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the utility model provides a corrugated pipe lined with fluorine regulating valve.

[0004] The technical solution provided by the utility model is as follows:

[0005] A corrugated pipe lined with fluorine regulating valve includes a fluorine-lined valve body and a PTFE corrugated pipe. The fluorine-lined valve body is provided with an inlet channel and an outlet channel. The inlet channel is communicated with the outlet channel through a middle cavity. A valve stem and a valve flap are arranged in the middle cavity. The lower end of the valve stem is connected to the valve flap, and the upper end extends upward out of the fluorine-lined valve body. The PTFE corrugated pipe is sleeved outside the valve stem. A fluorine-lined valve cover is arranged above the fluorine-lined valve body. The upper end of the PTFE corrugated pipe abuts against the fluorine-lined valve cover. A guiding and separating protrusion is arranged at the lower end of the valve flap. The guiding and separating protrusion divides the lower end of the valve flap into several flow regulating areas. Flow regulating grooves are arranged in the flow regulating areas. The flow regulating grooves include a first flow regulating groove and a second flow regulating groove. The length of the first flow regulating groove is greater than that of the second flow regulating groove. The first flow regulating groove and the second flow regulating groove are alternately distributed along the circumferential direction of the valve flap in several flow regulating areas.

[0006] The guiding and separating protrusion is in a cross shape and divides the lower end of the valve flap into four flow regulating areas. The first flow regulating groove and the second flow regulating groove are alternately distributed along the circumferential direction of the valve flap in the four flow regulating areas.

[0007] Both the first flow regulating groove and the second flow regulating groove are in a parabolic curved surface shape with the lower end point being the upper end point of the guiding and separating protrusion and the opening gradually becoming smaller from bottom to top.

[0008] The fluorine-lined valve body includes a valve body main body and a first fluorine-lined layer. A number of dovetail grooves are provided on the inner wall of the valve body main body, and a number of dovetail ridges matching the dovetail grooves are provided on the first fluorine-lined layer.

[0009] The fluorine-lined valve cover includes a valve cover main body and a second fluorine-lined layer. A number of dovetail grooves are provided on the inner wall of the valve cover main body, and a number of dovetail ridges matching the dovetail grooves are provided on the second fluorine-lined layer.

[0010] A packing is provided between the second fluorine-lined layer and the valve stem. A valve stem nut is provided on the valve stem, and the valve stem nut presses the packing by being threadedly connected to the valve cover main body.

[0011] An O-ring is provided between the valve stem nut and the valve stem.

[0012] An installation groove is provided on the valve flap. The lower end of the PTFE bellows is provided with an external thread and an internal thread. The PTFE bellows is fixed to the installation groove through the external thread and is fixed to the lower end of the valve stem through the internal thread.

[0013] An O-ring is provided in the installation groove, and the lower end of the PTFE bellows presses the O-ring.

[0014] A stepped surface is provided at the lower end of the valve stem, and a washer or a disc spring is provided between the stepped surface and the PTFE bellows.

[0015] The beneficial effects of the present utility model are as follows: By arranging a PTFE bellows on the outer side of the valve stem of the fluorine-lined regulating valve, the bellows can form a sealing protection for the valve stem, avoiding the erosion of the medium and ensuring the reliable operation of the valve; by arranging a guiding and separating protrusion at the lower end of the valve flap, the guiding and separating protrusion divides the lower end of the valve flap into several flow regulating areas. Flow regulating grooves are provided in the flow regulating areas. The guiding and separating protrusion can guide and divide the high-pressure medium under high-pressure medium working conditions, avoiding the impact of the medium on a single flow regulating groove. By arranging the flow regulating grooves as the first flow regulating grooves and the second flow regulating grooves that are alternately distributed along the circumferential direction of the valve flap, and the length of the first flow regulating groove is greater than the length of the second flow regulating groove, a two-stage control is achieved, and the curve corresponding to the flow regulation is smoother, ensuring the precise control of the flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of an embodiment of the present utility model;

[0017] Figure 2 is Figure 1 a partial enlarged view of DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following further describes the embodiments of the present utility model with reference to the drawings.

[0019] Such as Figure 1-2As shown in the figure, a corrugated pipe fluorine-lined regulating valve includes a fluorine-lined valve body, a PTFE corrugated pipe 6, a fluorine-lined valve cover, a valve stem 7, and a valve flap 3.

[0020] The fluorine-lined valve body includes a valve body main body 1 and a first fluorine-lined layer 2. A number of dovetail grooves 11 are provided on the inner wall of the valve body main body 1, and a number of dovetail ridges 21 that cooperate with the dovetail grooves 11 are provided on the first fluorine-lined layer 2, so that the first fluorine-lined layer 2 adheres to the inner side wall of the valve body main body 1. The dovetail grooves 11 and the dovetail ridges 21 are tightly fitted, ensuring that the dovetail ridges 21 are difficult to fall off from the dovetail grooves 11 during the frequent opening and closing of the valve. The fluorine-lined valve body is provided with an inlet passage 41 and an outlet passage 42, and the inlet passage and the outlet passage are connected through a middle cavity. The first fluorine-lined layer at the junction of the inlet passage and the middle cavity is used as a valve seat that forms a sealing fit with the valve flap 3.

[0021] The fluorine-lined valve cover is arranged above the fluorine-lined valve body and is detachably connected to the fluorine-lined valve body by bolts 10, which is convenient for assembly and maintenance. The fluorine-lined valve cover includes a valve cover main body 8 and a second fluorine-lined layer 9. A number of dovetail grooves 13 are provided on the inner wall of the valve cover main body 8, and a number of dovetail ridges 12 that cooperate with the dovetail grooves 13 are provided on the second fluorine-lined layer 9. Similarly to the above-mentioned fluorine-lined valve body, the dovetail grooves 13 and the dovetail ridges 12 are tightly fitted, so that the second fluorine-lined layer 9 adheres to the inner side wall of the valve cover main body 8.

[0022] The valve stem 7, the valve flap 3, and the PTFE corrugated pipe 6 are arranged in the middle cavity of the fluorine-lined valve body. An installation groove 4 is provided on the valve flap 3. The lower end of the PTFE corrugated pipe 6 is provided with an external thread and an internal thread. The PTFE corrugated pipe 6 is fixed to the installation groove 4 through the external thread. The PTFE corrugated pipe 6 is sleeved outside the valve stem 7 and is fixed to the lower end of the valve stem 7 through the internal thread at the lower end. An O-ring 5 is provided in the installation groove 4, and the lower end of the PTFE corrugated pipe 6 presses the O-ring 5 to prevent the medium from leaking from the gap between the PTFE corrugated pipe 6 and the valve plate 3. A stepped surface 52 is provided at the lower end of the valve stem 7. In this embodiment, a washer 51 is provided between the stepped surface 52 and the PTFE corrugated pipe 6. Both ends of the washer 51 press against the valve stem 7 and the inner wall of the PTFE corrugated pipe 6 respectively, so that the valve stem 7 and the PTFE corrugated pipe 6 are not easy to slide relative to each other. A disc spring can also be used to apply a pre-tightening force, and the support effect is better.

[0023] As Figure 2As shown, a guiding and separating protrusion 31 is provided at the lower end of the valve flap 3. The guiding and separating protrusion 31 is cross-shaped and divides the lower end of the valve flap into four flow regulation zones. The guiding and separating protrusion 31 can guide and divide the high-pressure medium under high-pressure medium conditions, avoiding the medium impacting a single flow regulation zone. Two flow regulation zones are shown in the attached drawing for illustration. The flow regulation zones are provided with flow regulation grooves, and the flow regulation grooves include a first flow regulation groove 33 and a second flow regulation groove 34. The length of the first flow regulation groove 33 is greater than the length of the second flow regulation groove 34. The first flow regulation groove 33 and the second flow regulation groove 34 are alternately distributed along the circumferential direction of the valve flap in the four flow regulation zones. Both the first flow regulation groove 33 and the second flow regulation groove 34 are in the shape of a parabolic curved surface with the opening gradually decreasing from bottom to top and the lower end point being the upper end point 32 of the guiding and separating protrusion, showing a two-stage control, and the curve corresponding to the flow regulation is smoother, ensuring the precise control of the flow rate.

[0024] In this embodiment, a packing 14 is provided between the second fluorine-lined layer 9 and the valve stem 7. A valve stem nut 15 is provided on the valve stem 7. The valve stem nut 15 is threadedly connected to the valve cover body 8 to compress the packing 14. An O-ring 16 is provided between the valve stem nut 15 and the valve stem 7 to prevent the medium from leaking through the gap between the valve stem and the second fluorine-lined layer 9, ensuring the reliability of the valve seal.

[0025] The embodiments should not be construed as limiting the present invention. Any non-creative improvement based on the spirit of the present invention should be regarded as within the protection scope of the present invention.

Claims

1. A bellows-lined fluorine regulating valve, characterized in that: It includes a fluorine-lined valve body and a PTFE bellows. The fluorine-lined valve body is provided with an inlet channel and an outlet channel. The inlet channel and the outlet channel are connected through a middle cavity. A valve stem and a valve flap are arranged in the middle cavity. The lower end of the valve stem is connected to the valve flap, and the upper end extends upward out of the fluorine-lined valve body. The PTFE bellows is sleeved outside the valve stem. A fluorine-lined valve cover is arranged above the fluorine-lined valve body. The upper end of the PTFE bellows abuts against the fluorine-lined valve cover. A guiding and separating protrusion is arranged at the lower end of the valve flap. The guiding and separating protrusion divides the lower end of the valve flap into several flow regulating areas. The flow regulating areas are provided with flow regulating grooves. The flow regulating grooves include a first flow regulating groove and a second flow regulating groove. The length of the first flow regulating groove is greater than that of the second flow regulating groove. The first flow regulating groove and the second flow regulating groove are alternately distributed along the circumferential direction of the valve flap in several flow regulating areas.

2. The bellows lined with fluorine control valve according to claim 1, wherein: The guiding and separating protrusion is in a cross shape and divides the lower end of the valve flap into four flow regulating areas. The first flow regulating groove and the second flow regulating groove are alternately distributed along the circumferential direction of the valve flap in the four flow regulating areas.

3. A bellows lined with fluorine control valve according to claim 1 or 2, characterized in that: Both the first flow regulating groove and the second flow regulating groove are in the shape of a parabolic curved surface with the lower end point being the upper end point of the guiding and separating protrusion and the opening gradually decreasing from bottom to top.

4. A bellows-lined fluorine regulating valve according to claim 1, characterized in that: The fluorine-lined valve body includes a valve body main body and a first fluorine-lined layer. A plurality of dovetail grooves are arranged on the inner wall of the valve body main body. The first fluorine-lined layer is provided with a plurality of dovetail ridges that cooperate with the dovetail grooves.

5. A corrugated pipe lined with fluorine control valve according to claim 1, characterized in that: The fluorine-lined valve cover includes a valve cover main body and a second fluorine-lined layer. A plurality of dovetail grooves are arranged on the inner wall of the valve cover main body. The second fluorine-lined layer is provided with a plurality of dovetail ridges that cooperate with the dovetail grooves.

6. A bellows lined with fluorine control valve according to claim 5, characterized in that: A packing is arranged between the second fluorine-lined layer and the valve stem. A valve stem nut is arranged on the valve stem. The valve stem nut is threadedly connected to the valve cover main body to compress the packing.

7. A bellows-lined fluorine regulating valve according to claim 6, characterized in that: An O-ring is arranged between the valve stem nut and the valve stem.

8. The bellows lined with fluorine control valve according to claim 1, characterized in that: An installation groove is arranged on the valve flap. The lower end of the PTFE bellows is provided with an external thread and an internal thread. The PTFE bellows is fixed in the installation groove through the external thread and fixed to the lower end of the valve stem through the internal thread.

9. The bellows lined with fluorine control valve according to claim 8, characterized in that: An O-ring is arranged in the installation groove. The lower end of the PTFE bellows compresses the O-ring.

10. A bellows-lined fluorine regulating valve according to claim 8, characterized in that: A stepped surface is arranged at the lower end of the valve stem. A washer or a disc spring is arranged between the stepped surface and the PTFE bellows.

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