(gate valve) is the gate to open and close parts, ram direction of motion perpendicular to the direction of the fluid, valve only for full-and full-off, can not be adjusted and cut expenditure. There are two gate sealing surface, the most common mode of gate valve sealing surface to form two wedge-shaped, wedge-shaped angle with the valve parameters vary, usually 50, medium temperature is not high when 2 ° 52 '. Wedge gate valve gate can be made into a whole, called the rigid damper; also be made to produce small quantities of deformation gate in order to improve their craft-oriented, to make up the sealing surface angle in the processing error generated in the process, this sluice gate is called elastic.
Valve types, according to the sealing surface configuration can be divided into wedge gate-type valve and parallel gate-type valve, wedge gate-type valve can be divided into: single-gate type, Shuangzha plate and elastic damper type; parallel gate-type valve can be divided into single-ram type and Shuangzha plate. Location by stem thread are divided into Ming and dark rod valve valve two kinds of stroke.
Valve closed, the sealing surface can only rely on media pressure to seal, that is, to rely on media pressure to ram pressure to the other side of the sealing surface of the seat to ensure the sealing surface of the seal, which is self-sealing. Most of mandatory sealed valve is used, namely, the valve is closed, we must rely on outside pressure to force the gate to the seat in order to ensure the sealing surface of the seal.
The gate valve with the valve stem to make a straight line with the movement, called the lift rod valve (also called Ming shot valve). Often movements are trapezoidal threaded rod through the valve nut and the valve on the top of the guide groove, the rotary motion into linear motion, that is, the operation of torque, thrust into action.
Open the valve, when the gate valve lifting height is equal to 1:1 times the diameter, the fluid flow channel completely, but at run time, this location can not be monitored. Actual use, based on the apex of stem as a sign that the movement of non-position, as its fully open position. Temperature changes appear to consider locking phenomenon, usually open to the vertex position, and then inverted back 1/2-1 circle, as a fully open valve position. Therefore, the valve fully open position, according to damper position (ie, travel "to determine.
Some valve, the stem nut is located at the gate, the hand-driven rotation of valve stem rotation, leaving gate to upgrade, this valve is called the rotating rod valve or valve called the dark bar.
Manual valve works:
Handwheel by hand wheel and stem of the thread forward, back, raised or lowered to connect the valve plate with the stem to achieve the role of open and closed
Valve has the following advantages:
Fluid resistance is small, the sealing surface by the media, distressed small brush and erosion.
Opening and closing more labor-saving.
Medium flows unrestricted, non-spoiler, without reducing pressure.
A simple shape, structure, length short, good manufacturing processes applicable to a wide range.
Valve defects are as follows:
Between the sealing surface could easily cause erosion and abrasion, maintenance more difficult.
Overall large size, open requires a certain space, opening and closing a long time.
Structure is more complicated.
The type of gate width, according to the sealing surface configuration can be divided into wedge gate-type valve and parallel gate-type valve, wedge gate-type valve can be divided into: single-gate type, Shuangzha plate and elastic damper type; parallel gate-type valve can be divided into single-ram type and Shuangzha plate. Location by stem thread are divided into Ming and dark rod valve valve two kinds of stroke.
Valve installation and maintenance should note the following items:
Hand-wheel, handle and the transmission mechanism for lifting are not allowed to use, and are prohibited from collisions.
Shuangzha vertical plate gate valve should be installed (ie, stem in a vertical position, the hand wheel at the top).
With a bypass valve to open the valve opening should be preceded by-pass valve (in order to balance imports and exports and reducing pressure opening force).
The valve with a transmission mechanism, according to product instructions for the installation.
If you frequently switch the valve to use, lubrication at least once a month.
Structural features:
For a long time on the market with the general valve widespread the phenomenon of water leakage or rust, the introduction of European high-tech enterprise manufacturing technology of the rubber and the valve seat seal gate valve produced the flexibility to overcome the general bad valve seals, rust, etc. defects, flexible valve seat seal gate produce small quantities of elastic compensation for the role of elastic deformation to achieve a good sealing effect, the valve has a switch light, sealing, reliable, good elastic memory, and the service life of significant advantages. It can be widely used in tap water, sewage, construction, petroleum, chemical, food, medicine, textile, electric power, shipbuilding, metallurgy, energy systems, pipelines, as a regulating body and the closure device.
Gate features:
Light weight: body made of high grade cast iron ball black, lighter in weight than conventional valve to reduce the weight of about 20% to 30%, installation and maintenance easy.
Flat-type gate seat: Traditional washing pipe valve often pass as soon as a result of foreign objects such as stone, wood, cement, iron filings, and other debris deposited on the valve at the end of recess, the easily lead to the formation of leakage can not be closed tightly and the phenomenon of and flexible use of seat seal gate valve at the bottom of the pan with the water machines with the design, easy to siltation caused by debris, so that smooth flow of fluid.
Overall Package glue: gate using high quality rubber as a whole, the outsourcing of glue, Europe's leading technology allows vulcanized rubber vulcanization after the gate to ensure accurate geometry, and the rubber and solid ductile cast gate and then not easy to come off and flexible memory good. Water
Casting Valve: Valve using precision casting, precision geometry makes the body without any finish can be guaranteed within the valve sealing.
Valve has the following advantages:
1, fluid resistance is small, the sealing surface by the media, distressed small brush and erosion.
2, opening and closing more effort.
3, medium flow unrestricted, non-spoiler, without reducing pressure.
4, a simple shape, structure, length short, good manufacturing processes applicable to a wide range.
Valve defects are as follows:
1, between the sealing surface could easily cause erosion and abrasion, maintenance more difficult.
2, form large size, open requires a certain space, opening and closing a long time.
3, the structure more complex.
The type of gate width, according to the sealing surface configuration can be divided into wedge gate-type valve and parallel gate-type valve, wedge gate-type valve can be divided into: single-gate type, Shuangzha plate and elastic damper type; parallel gate-type valve can be divided into single-ram type and Shuangzha plate. Location by stem thread are divided into Ming and dark rod valve valve two kinds of stroke.
Valve installation and maintenance should note the following items:
1, hand wheels, handles and the transmission mechanism for lifting are not allowed to use, and are prohibited from collisions.
2, Shuangzha plate gate valve should be mounted vertically (ie the stem in a vertical position, the hand wheel at the top).
3, with a bypass valve opens the valve opening should be preceded by bypass valve (in order to balance imports and exports and reducing pressure opening force). Stainless steel electrode
4, with transmission of the valve, according to product instructions for the installation.
5, if the valve frequently switch the use of lubrication at least once a month.
Gate of the main criteria
(1) GB12232-89 "Link Universal Valve Flanged iron gate valves"
(2) GB12234-89 "universal valve steel gate valve connecting flange and butt"
(3) GB8486-87 "threaded connection within the gate, as valve, ball valve, check valve common technical regulations"
(4) GB8465.1-87 "threaded connection within the gate, as valve, ball valve, check valve basic size iron gate"
(5) JB/T53162-94 "Valve Product Quality Grading"
(6) JB/T5298-91 "pipeline with the steel plate gate valve"
(7) JB/Z243-85 "gate static life test procedures"
(8) JB/TQ648-88 "Flat Iron Gate on the folder"
(9) JB/T53200-94 "iron gate valve on the price of flat-panel product quality grading"
(10) JB/T53242-94 "steel plate gate valve product quality and grading"
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