CN2231746Y

CN2231746Y - Concealed rod flat gate valve for pipeline

Info

Publication number: CN2231746Y
Application number: CN 95242080
Authority: CN
Inventors: 马连科; 元永泰
Original assignee: CITY GAS PLANNING DESIGN INST CHENGDU; Valve Branch Of No5719 Factory Pla
Current assignee: CITY GAS PLANNING DESIGN INST CHENGDU; Valve Branch Of No5719 Factory Pla
Priority date: 1995-08-30
Filing date: 1995-08-30
Publication date: 1996-07-24
Anticipated expiration: 2005-08-30

Abstract

The two valve seats of the valve of the utility model are prolonged with the stroke distance of the switch to enable the flat surface of a valve seat plate to contain a gate plate with full travel stroke. When the gate plate completely closes a passage. The hole cavity of flow guiding of the gate plate is completely blocked by a prolonged portion and is isolated in the inner cavity of a valve body. Thus preservative oil with lubrication can be additionally provided into a cavity body and also the dust impurity of conveyed medium can also not be accumulated in the inner cavity. The switch indicating device of a gate valve designed by the valve adopts a single gear to drive a plurality of gears to change the multiple back rotations into the partial back rotation of 270 DEG to be served as the indicating mechanism of the switch of a ground-bury valve. A lipa pouring mechanism comprises a lipa pouring cup on a valve cover and a lipa guiding pipe welded in the valve body. A lipa pouring hole path is communicated to the corresponding hole path on the valve seats by the hole path of the sealing surface of the valve body and the valve cover to obtain the purpose of sealing the sealing surface of the passage.

Description

The pipeline dark rod flat plate gate valve

The utility model relates to a kind of plate valve, the underground dark rod flat plate gate valve of particularly a kind of direct-burried.

Existing plate valve, because of the overall structure reason, direct-burried is underground all the year round, and at first being that inner body is anticorrosion and lubricated can't realize that after service time was long, the corrosion of part was serious, influences sealing effect; The secondth, do not have tangible switch indicating device, be unallowed as buried valve, the 3rd be the ordinary flat gate valve imbed underground after, can not can't guarantee sealing to channel seal face filling seal gease; The 4th, the ordinary flat valve body is long-pending tall and big, can't build little valve chamber, can only build big ground well.

The purpose of this utility model be a kind of good seal of design, anticorrosive, operation is directly perceived, but the underground plate valve of direct-burried.

Structural feature of the present utility model has reached above-mentioned purpose, it comprises valve body, valve gap, valve rod and flashboard, pod apertures is arranged on the flashboard, it is characterized in that two valve seats prolong a switching path distance downwards, valve seat is close to flashboard to the folder sealing surface, constitutes the water conservancy diversion vestibule, angle sealing thrust O shape circle, thrust spring and soft seal ring, body cavity and medium channel isolating seal are housed on the valve seat.Adopt body cavity and medium channel chamber to separate structure; make the folder sealing surface is close to flashboard formation water conservancy diversion vestibule; for reliably being close to the folder sealing surface, valve seat explains plate; the angle sealing thrust O shape circle of on valve seat, installing; thrust spring and soft seal ring; make it form enough axial push-tight sealing forces; valve seat is close to flashboard; although flashboard is made switch and is moved up and down; body cavity and medium channel are in all the time and separate sealing state; and then toward body cavity filling heavy oil; it is lubricated so just to have reached the anticorrosion and switch of protection flashboard sealing surface internal works, reduces the effect of torsional moment.

This valve is the blind rod type plate valve, direct-burried is underground, if switch indicating device is not set, be difficult to judge the switching position, for this reason, the utility model is provided with the open and close indicating device on the valve top, be made up of single-tooth gear, spur wheel, dial, pointer, bearing and position-limit mechanism, single-tooth gear is a driving wheel, meshes with spur-gear wheel, spur-gear wheel is provided with position-limit mechanism, and single-tooth gear, bearing all are installed on the valve rod main shaft.

This structural feature has adopted the intermittent gear transmission principle, promptly utilize the single-tooth gear on valve rod top to turn around, drive has the method for a tooth of spur wheel commentaries on classics of switch pointer, make many revolutions become 270 ° part revolution, thereby reach the purpose of indicating valve gate switch, and limit the not stationarity that spur wheel rotates with position-limit mechanism.

Because this valve is imbedded underground, therefore, except that require its anticorrosion and on off state intuitively, for guaranteeing to imbed the sealing of underground valve, the utility model has been installed the greasing sealing mechanism that is made of greasing cup and fat guiding tube on valve, greasing cup is installed in (ground is not buried on valve gap top) on the valve gap, and fat guiding tube is welded on the valve body, greasing hole path directly is connected with respective aperture road on the valve seat by the sealing surface and the fat guiding tube of valve gap and valve body.Whole greasing hole path is the enclosed construction form, and is both simple, be suitable for again, and circle of the radial seal O shape on the valve seat and angle seal ring formation Seal cage, guarantee that seal gease does not leak, thereby reach purpose from seal gease to sealing surface that annotate.

The utility model is by the technical measures of above-mentioned four aspects, make this valve have reliable sealing, anticorrosion lubricated, operation is directly perceived, be convenient to keep in repair, the characteristics of simple in structure, long service life, ground well need not be built, only a little valve chamber need be built, as shown in Figure 4, operator are only in terrestrial operation, take urban land less, alleviated labor intensity again, its social benefit and economic benefit are all bigger, are the well behaved dark bar plane gate valves that a kind of town gas that is worthy to be popularized, natural gas transmission pipeline are used.

Describe the utility model in detail below in conjunction with accompanying drawing:

Fig. 1: the utility model assembly structure figure

The A-A sectional drawing of Fig. 2: Fig. 1

The D of Fig. 3: Fig. 2 is to view

Fig. 4: the buried schematic representation of this dark rod flat plate gate valve.

Sequence number thes contents are as follows among the figure:

1, filler hold-down bolt, 2, greasing cup, 3, valve gap, 4, valve body, 5, fat guiding tube, 6, valve rod, 7, Stem Mut, 8, valve seat, 9, O-ring seals, 10, hydraulic oil, 11, flashboard water conservancy diversion vestibule, 12, flashboard, 13, plug, 14, dial, 15, switch pointer, 16, O RunddichtringO, 17, bearing, 18, stuffing box, 19, position-limit mechanism, 20, spur wheel 21, single-tooth gear.22, thrust spring, 23, soft seal ring.

This valve prolongs a switching path distance downwards with two valve seats 8; formation is close to flashboard water conservancy diversion vestibule to the folder sealing surface; for making valve seat reliably be adjacent to flashboard 12 to the folder sealing surface; angle sealing thrust O shape circle 9 is housed on valve seat 8; thrust spring 22 and soft seal ring 23; make it form enough axial push-tight sealing forces; valve seat is close to flashboard; although flashboard is made switch and is moved up and down; body cavity and medium channel are isolated all the time; like this; fill heavy oil toward body cavity again, just reached protection flashboard sealing surface; the lubricated effect that reduces torsional moment of the anticorrosion and switch of internal works.

The switch indicating device is made up of single-tooth gear 21, spur wheel 20, dial 14, bearing 17 and position-limit mechanism 19, and single-tooth gear is a driving wheel, and with the spur wheel engagement, single-tooth gear, bearing all are installed on the valve rod 6, and dial and pointer are installed on the spur wheel.Single-tooth gear turns around, and the spur wheel that has the switch pointer changes a tooth, makes many revolutions become 270 ° parts revolution, reaching the purpose of indicating valve gate switch, and the not stationarity of rotating by position-limit mechanism 19 restriction spur wheels.

For guaranteeing the sealing of buried valve, installed on valve gap 3 by greasing cup 2, fat guiding tube 5 is welded on the valve body 4, and the fat guiding tube upper end joins by the sealing surface and the greasing cup of valve gap 3 with valve body 4, the lower end links to each other with respective aperture road on the valve seat 8, whole greasing hole path is the enclosed construction form, and is both simple, is suitable for again, simultaneously, radial seal O shape circle and angle seal ring on the valve seat 8 form Seal cage, guarantee that seal gease does not leak, thereby reach purpose from seal gease to sealing surface that inject.

Claims

1, pipeline dark rod flat plate gate valve, comprise valve body, valve gap, valve rod and flashboard, pod apertures is arranged on the flashboard, it is characterized in that two valve seats prolong a switching path distance downwards, valve seat is close to flashboard to the folder sealing surface, constitute the water conservancy diversion vestibule, angle sealing thrust O shape circle, thrust spring and soft seal ring, body cavity and medium channel isolating seal are housed on the valve seat.

2, according to the described pipeline dark rod flat plate gate valve of claim 1, it is characterized in that there is the open and close indicating device on the valve top, form by single-tooth gear, spur wheel, dial, pointer, bearing and position-limit mechanism, single-tooth gear is a driving wheel, mesh with spur-gear wheel, position-limit mechanism is arranged on the spur-gear wheel, and dial, pointer are installed on the spur wheel, and single-tooth gear, Bearing Installation are on the valve rod main shaft.

3, according to the described pipeline dark rod flat plate gate valve of claim 2, it is characterized in that having the greasing sealing mechanism that constitutes by greasing cup and fat guiding tube, greasing cup is installed on the valve gap, fat guiding tube is welded on the valve body, greasing hole path is by the sealing surface and the fat guiding tube of valve gap and valve body, and respective aperture road direct and on the valve seat is connected.