4, several common leak point pressure plugging Methods
Power production based on the specific circumstances of the scene, you can regulate the use of replacement valves, valve packing replacement regulation, the replacement flange gasket holes or welding methods to eliminate the general leakage.
However, the production adjustment in the operation of the valves, in the circumstances can not be isolated, you must take the appropriate technical means to eliminate the leakage, to ensure safety in production units of normal operation.
4.1-conditioning plant rooms fill valve leak plugging to deal with pressure
Note the use of pressure-type blocking agent technology is a relatively safe and reliable technological means, it uses special fixture and hydraulic injection tool sealant injected into the fixture with the leakage of some parts of the formation of the outer surface of the sealed cavity, quickly to make up for the leakage of various complex defects. Agent in the injection pressure is greater than the leakage of the medium pressure conditions, the leakage was stopped forcibly injecting agent in a short period of time from their own body into a plastic elastomer to form a sealed flexible structure and can maintain a certain ratio of the work of sealing pressure, to achieve the purpose of re-sealed. At present, domestic production and use of the sealing agent injected roughly divided into two types: one is the injection of heat-curable sealing agent, such injection agents can only reach a certain temperature by the body into a plastic elastomer, room temperature is solid; another a class of non-heat-curable sealing agent injection, which applies to room temperature, low temperature and high temperature dynamic seal occasions operational requirements, such sealing agent injected into more than two-component rod-like solid or a greasy-like material, to the gun mounted on a high-pressure injection after a certain pressure of the injection process has a good and filling, and without loss of function of regulating valve. Here are two common methods:
(1) letter fill valve for regulating the wall thickness of greater than about 8mm, in dynamic conditions with the use of injection-type pressure plugging the elimination of defects can be directly in the regulation of the fill valve to open letter on the wall the way hole injection agent operation, to seal the cavity of the fill valve is regulating its own letter into the letter to the regulator within the valve seal packing Note the role of agent and fill the same role. The first letter in the regulation of the outer wall of the filler valve at appropriate locations 10.5mm or 8.7mm diameter drill hole, hole钻透not about to stay 1 - 3mm or so, the withdrawal of the bit, with the M12 or M10 tap tapping attack wire after the injection of agents dedicated to the fastening plug valves, and in the open position, the pole 3mm diameter drill bit to fill the remaining letter of the regulation valve钻透wall, when medium leakage along the drill bit cut row to the direction of emission, in order to prevent drilling at high temperature and high pressure, toxic or corrosive medium strong smoke wounding, using a pre-drilled hole baffle, first used in the tailgate of a drill boring a hole diameter of 5mm, make it a bit too long on sets, together with the remaining wall thickness baffle drilling will not be dangerous. Remove the drill holes钻透after the injection stopcock agents dedicated to the fastening location clearance, cutting medium to connect to high-pressure injection agent injection gun sealing agent injection operation. If the fill valve regulating the pressure of low dielectric letter, 3mm in diameter can also be used directly for long drill hole钻透, and then seal injection operations agent operation.
June 2003, Pangang 3 # machine electric power plant main steam valve is leaking from the sealed Grand plugging using this technology to solve the problem of regulating valve leakage, to avoid a non-stop can not be, things can be resolved.
(2) In the case of thin-walled packing adjustment letter valves, auxiliary fixture can be used for dynamic sealing operation. Auxiliary fixture valve adjustment to try to fill the wall thickness of less than letter, which is equivalent to a fixed fill valve in the regulation of the special joint letter wall, is designed to connect high-pressure injection gun agent. Machining fixture can hardly be the ideal way to fit the local surface conditions permit in the circumstances, it can be an appropriate adjustment valve repair letter wall filler to make it better with the supporting fixture fitting. If the leakage of the fill valve regulating the shape of the outer wall does not allow complex or finishing conditions, the supporting jig in the bottom of an asbestos mat or rubber plate rubber plate, clamp bolts tightened so that the rubber pad in the following board to plug a good fit surface cracks. There should be a fixture on the auxiliary note agent with stopcock affixed to pieces of thread to match, then fill with the wall thickness of the same letter the operation, the entire sealing operation is completed, do not immediately switch regulating valves, seals, etc. Note curing agent before in normal use.
In mid-November 2002, Panzhihua Iron and Steel plant high-pressure heater water balance valve flange gate leakage, as a result of the adjustment letter fill valve thin-walled, that is, the production of auxiliary fixture used for dynamic sealing operations, to solve the regulator valve leakage.
4.2 Leakage power regulator valve with flange pressure to deal with plugging
4.2.1 wire containment method
It is suitable for smaller gap between the flange, uniform amount of space, leakage of medium pressure and low pressure plugging, can be removed directly placed on the bolt special bolt joint injection agent, the general of not less than two.
Notes agent installed a connector nut should be loosened, joints installed Notes agent, the rapid re-tighten the nut, and then note the installation of additional agents joints, not at the same time will be required to release the connector nut, so as to avoid the sealing gasket on the pressure decreased, increased leakage, or even medium will leak gasket blown away, leading to irreparable consequences. If a larger amount of the original leak, G-shaped clip can be used to maintain pressure balance seal, installing bolts agent injection, the use of tools or slightly less than the diameter of flange leakage of copper wire embedded in space gap in the flange at the same time the outer flange lip out, so that fixed-wire gap in the flange, so the formation of a new sealed cavity. And then to connect high-pressure injection gun for dynamic sealing agent operation, note the direction of agents from the Department, followed by leakage points to the contrary, the end should be near the leakage point.
June 2003, Power Plant # 1 machine Pangang Unicom tube low-pressure leakage of the vertical flange is using technology to solve this plugging the Unicom leakage pipe flange to avoid a shutdown accident.
4.2.2 containment strip method
Slightly larger gap between the flange when no more than 8mm, medium pressure is less than 2.5MPa, the strip can be transported to contain state law sealing operation. Its two flange coaxiality higher requirement of uniformity of flange do not ask for much space. General selection of steel 1.5 - 3.0mm thickness, width 20 - 30mm can be produced when using welding or riveting, the two connectors to be added below the transition gasket, in accordance with the installation of flange size to determine the number of joints injected agent. Installation of steel, the steel should be located in the gap between the two flanges on the connecting bolts slightly twisted a few buttons, and then adding the two transition gasket, all enclosed flange gap and continue to tighten the bolts, and ultimately form a complete sealed cavity, then you can dynamically sealing operation. ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve Three way ball valve V Type Ball Valve
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