Non-rising stem flat gate valve convenient to install

Abstract

The utility model relates to a non-rising stem flat gate valve convenient to install, which comprises a valve body, a valve seat, a gate plate and a valve stem, the valve seat is installed in an inner cavity of an inlet and outlet channel of the valve body, the gate plate adopts a structure with a flow guide hole, and a non-rising stem connecting structure is adopted between the valve stem and the gate plate; the utility model is characterized in that an inlet and outlet pipeline of the valve body is connected with an external pipeline by adopting a fastening connection device consisting of a threaded connection boss, a locking nut and a fastening ring, and the valve body and the external pipeline can be mounted in a wedged manner or loosened and dismounted by rotating the locking nut, so that the valve has the advantages of convenience in mounting or dismounting, time saving, reliable connection and sealing and the like; the device is especially suitable for a PE pipeline of a sewage system.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the valve field especially, it relates to a concealed rod flat plate sluice valve. BACKGROUND

[0002] The concealed rod flat plate sluice valve is widely used in the blowdown pipeline system because of the full through flow, the medium impurities not easy to deposit in the valve cavity and the small height after opening. The flat plate sluice valve has two structures of having a flow guide hole and not having a flow guide hole, and the flat plate sluice valve with the flow guide hole can better protect the valve seat sealing surface after opening. The valve rod of the concealed rod flat plate sluice valve is matched with the center screw hole of the sluice plate by the external thread, and the sluice plate moves in the axial direction of the outer circumference of the valve rod in the opening and closing process, the valve rod only rotates without lifting, the valve installation space is small, the inlet and outlet passages of the valve body are generally connected with the flow and transport pipeline by the flange or welding, and the valve can only be connected with the pipeline by the flange in the PE pipe of the blowdown system. The main defects are as follows: in the installation of the valve, the flange connection mode needs to weld the connecting flanges on the pipelines at the two ends of the inlet and outlet of the valve, and then the valve body flange and the pipeline flange are sealed and fixedly connected by the bolts and the nuts, and the installation or dismounting is relatively troublesome; moreover, the expansion coefficients of the blowdown PE pipe and the valve body metal material are relatively large, and the thermal expansion and cold contraction can easily lead to the leakage of the flange connection mode. CONTENT

[0003] The utility model provides a kind of concealed rod flat plate sluice valve of installing valve on pipeline by buckling mode, and the installation and dismounting are convenient, and the sealing performance is reliable.

[0004] The technical scheme for realizing the utility model is as follows:

[0005] A kind of concealed rod flat plate sluice valve, including valve body, valve seat, sluice plate, valve rod, valve seat is installed in the inner cavity of the inlet and outlet passage of valve body, sluice plate adopts the structure of having a flow guide hole, and the dark rod connection structure is used between valve rod and sluice plate;Its characterized in that: the buckling connection device is arranged on the outer circumferential surface of the inlet passage and the outlet passage of valve body respectively, the buckling connection device is composed of threaded connection boss, locking nut and buckling ring, the threaded connection boss is provided with annular mounting groove between the outer circumferential surface of the inlet passage and the outlet passage, the inner circumferential surface of the annular mounting groove has axially extending cylindrical surface which is matched with the inner hole of the external pipeline, the outer circumferential surface has conical surface, the external thread of the threaded connection boss is matched and connected with the internal thread of the locking nut, the buckling ring is buckled and mounted between the outer circumferential surface of the external pipeline and the annular mounting groove by the locking nut, and the outer circumferential surface has outer conical surface which is matched and wedged with the conical surface of the annular mounting groove.

[0006] In the above technical scheme, a plurality of annular sawtooth grooves are uniformly arranged on the axially extending cylindrical surface of the inner circumferential surface of the annular mounting groove, and the sawtooth formed between adjacent annular sawtooth grooves is arranged in the direction of the inner cavity of the valve body.

[0007] In the above technical scheme, the inner circumferential surface of the annular muscle between the adjacent annular grooves and the annular muscle at both ends of the fastening ring is in contact with the outer circumferential surface of the external pipeline.

[0008] In the above technical scheme, the sealing ring is arranged on the cylindrical surface extending axially on the inner circumferential surface of the annular mounting groove.

[0009] The beneficial effects of the present utility model compared with the prior art are that the inlet channel and the outlet channel of the valve body are connected with the external pipeline through the fastening connecting device, the connection is not easy to leak due to temperature change, and the present utility model has the advantages of convenient installation and disassembly, reliable sealing performance, etc. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is a structural schematic view of the present utility model.

[0011] In the drawing: 1 valve body, 2 valve seat, 3 gate plate, 4 valve rod, 5 inlet channel, 6 outlet channel, 7 threaded connection boss, 8 locking nut, 9 fastening ring, 10 external pipeline, 11 annular mounting groove, 12 annular sawtooth groove, 13 annular groove, 14 sealing ring. DETAILED DESCRIPTION

[0012] As Figure 1The illustrated portable concealed stem flat gate valve comprises a valve body 1, a valve seat 2, a gate plate 3, and a valve stem 4. The valve seat 2 is installed in the inlet and outlet passages of the valve body 1. The gate plate 3 adopts a structure with flow guide holes. The valve stem 4 and the gate plate 3 adopt a concealed stem connection structure, that is, the valve stem 4 does not move axially when rotating during opening and closing, and the gate plate 3 moves axially up and down with the valve stem 4. The valve body 1 is characterized in that a clamping connection device is arranged on the outer circumferential surface of the inlet passage 5 and the outlet passage 6 of the valve body 1. The clamping connection device comprises a threaded connection boss 7, a locking nut 8, and a clamping ring 9. An annular mounting groove 11 is arranged between the threaded connection boss 7 and the outer circumferential surface of the inlet passage 5 and the outlet passage 6. The inner circumferential surface of the annular mounting groove 11 has an axially extending cylindrical surface which cooperates with the inner hole of the external pipeline 10. The outer circumferential surface has a conical surface. The external threads of the threaded connection boss 7 and the internal threads of the locking nut 8 are connected in cooperation. The clamping ring 9 is clamped and mounted between the outer circumferential surface of the external pipeline 10 and the conical surface of the annular mounting groove 11 by the locking nut 8. One end of the clamping ring 9 has an outer conical surface which is tightly wedged with the conical surface of the annular mounting groove 11. The other end is in contact with the radial inner step of the locking nut 8. The clamping ring 9 and the radial inner step of the locking nut 8 can be in contact with each other through a bevel or a radial plane. By rotating the locking nut 8, the internal threads of the locking nut 8 and the external threads of the threaded connection boss 7 are in transmission with each other, so that the locking nut 8 moves axially along the threaded connection boss 7. The clamping ring 9 is embedded in the outer circumferential surface of the external pipeline 10 and the conical surface of the annular mounting groove 11, and the external pipeline 10 is tightly wedged and mounted on the outer circumferential surface of the inlet passage 5 and the outlet passage 6.

[0013] The technical feature produces the technical effect that the inlet and outlet pipelines of the valve body 1 are connected and mounted with the external pipeline 10 by the clamping connection device comprising the threaded connection boss 7, the locking nut 8, and the clamping ring 9. The valve body 1 and the external pipeline 10 can be tightly wedged and mounted or loosened and disassembled by rotating the locking nut 8. The installation and disassembly are convenient and time-saving. The sealing performance is reliable in the connected state.

[0014] A plurality of annular sawtooth grooves 12 are uniformly arranged on the axially extending cylindrical surface of the inner circumferential surface of the annular mounting groove 11. The sawteeth formed between adjacent annular sawtooth grooves 12 are directed to the direction of the inner cavity of the valve body 1. A multiple linear sealing structure is formed between the inner hole wall of the external pipeline 10 and the cylindrical surface.

[0015] The technical feature produces the technical effect that a linear contact wedge connection structure is formed between the inner hole wall of the external pipeline 10 and the outer circumferential surface of the inlet and outlet passages. A multiple linear sealing structure is formed between them. The connection is firm and reliable, and the sealing performance is good.

[0016] A plurality of annular grooves 13 are evenly arranged on the inner wall of the fastening ring 9. The inner circumferential surface of the annular ribs between adjacent annular grooves 13 and the annular ribs at both ends of the fastening ring are in contact with the outer circumferential surface of the outer connecting pipeline 10, thereby reducing the contact area between the fastening ring 9 and the outer circumferential surface of the outer connecting pipeline 10 and lowering the moving friction of the fastening ring 9.

[0017] The technical features produce the technical effects that the annular ribs of the fastening ring 9 are in contact with the outer circumferential surface of the outer connecting pipeline 10, the moving friction between the fastening ring 9 and the outer circumferential surface of the outer connecting pipeline 10 is reduced, the rotating force of the locking nut 8 during installation or disassembly is reduced, and the operation performance is improved.

[0018] A sealing ring 14 is arranged on the cylindrical surface extending axially on the inner circumferential surface of the annular mounting groove 11, thereby improving the sealing reliability between the two.

Claims

1. A portable concealed stem flat gate valve, comprising a valve body (1), a valve seat (2), a gate plate (3), a valve stem (4), the valve seat (2) is installed in the inlet and outlet channel of the valve body (1), the gate plate (3) adopts a structure with flow guide holes, and the valve stem (4) and the gate plate (3) adopt a concealed stem connecting structure; characterized in that: The invention discloses a valve body (1) and an outer circular surface of an inlet channel (5) and an outlet channel (6) are provided with fastening connection devices, which are composed of a threaded connection boss (7), a locking nut (8) and a fastening ring (9). An annular mounting groove (11) is arranged between the threaded connection boss (7) and the outer circular surface of the inlet channel (5) and the outlet channel (6), and the inner surface of the annular mounting groove (11) is provided with an axially extending cylindrical surface matched with the inner hole of an outer connecting pipeline (10), and the outer surface is provided with a conical surface. The outer thread of the threaded connection boss (7) is matched and connected with the inner thread of the locking nut (8). The fastening ring (9) is fastened and mounted between the outer circular surface of the outer connecting pipeline (10) and the conical surface of the annular mounting groove (11) by the locking nut (8), and the outer circular surface of one end is provided with an outer conical surface matched with the conical surface of the annular mounting groove (11). ​ 2. The portable flat gate valve with concealed stem according to claim 1, characterized in that: in The axially extending cylindrical surface of the inner surface of the annular mounting groove (11) is uniformly provided with a plurality of annular sawtooth grooves (12), and the sawtooth formed between adjacent annular sawtooth grooves (12) faces the direction of the inner cavity of the valve body (1), and a multiple linear sealing structure is formed between the inner hole wall of the outer connecting pipeline (10) and the cylindrical surface.

3. The portable flat gate valve with concealed stem according to claim 2, characterized in that: The inner circular wall of the fastening ring (9) is uniformly provided with a plurality of annular grooves (13), and the annular ribs between adjacent annular grooves (13) and the inner circular surface of the annular ribs at both ends of the fastening ring (9) are in contact with the outer circular surface of the outer connecting pipeline (10), so as to reduce the contact area between the fastening ring (9) and the outer circular surface of the outer connecting pipeline (10).

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