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1 SCHUCK valve body analysis 1.1 SCHUCK ball valve housing is different from the common ball valve welding SCHUCK ball valve with two semi-circular forged steel shell in the bearing surface with only a weld, the welding shell and with a small amount of external tolerance Sphere in line with the shape. Valve body Two semi-circular forged steel shell in the bearing surface with only a vertical weld seam, the vertical weld and the valve seal seat parallel to the state, which avoids the valve body welded shell on both ends of the valve Seat soft sealing materials at high temperature damage. 1.2 All-Welded Ball Valves; SCHUCK valves are forged bodies and spheres and are true all-welded constructions. No part of the valve body is bolted or bolted to the valve body, thus eliminating all potential leak paths, Has the best safety performance. 1.3 ball valve is a fixed ball, its support ring system can be self-centering and floating, and with a preloaded spring element, the ball pin positioning, sealing force increases automatically with the pipeline pressure. 1.4 valve stem for the anti-explosive design; the overall structure of the stem and the ball, the ball valve opening and closing only a very low torque, its sealing and bearings are maintenance-free and maintenance-free, the highest pipeline pressure, no Interrupt the pipe work and replace the shaft seal. 2 SCHUCK valve stem, seat seal analysis 2.1 The stem is sealed with 3-level sealing device, with fire-proof function; the three-stage sealing device consists of the first stage by the spring pre-pressure composition, the second stage by the upper and lower two isolation ring And the middle of the fire seal composition, the third level has O-ring and can further tighten the bolt composition. Three seals from the bottom to ensure the sealing of the stem and fire safety. By increasing the pre-pressure spring to further compress the seal ring, seal ring to increase the driving force to prevent leakage, but also in the case of injection pressure replacement U-shaped main seal ring. 2.2 Double-acting seat at both ends of the valve seat, PMSS seal, metal-to-metal seal, and seal aids with extra textured rubber for sealing. This valve seal with wear-resistant, difficult to deposit, easy to dirty characteristics, it is possible to achieve "0" leakage. The design of the drip-type seal groove increases the sealing performance of the ball valve, and in particular, prolongs the service life of the seal. 2.3 Body Accessories and Functional Analysis ball valve with sewage pipes and exhaust pipe can be ruled out pipe dirt can be excluded from the ball cavity is too high pressure or automatic discharge in the pipeline too high pressure to increase the ball valve seal and test Whether the ball valve is completely sealed and has anti-static function. Each of the upstream and downstream of the ball valve has an air supply line for supplying air to the actuator cylinder. Each line has two ball valves. Normal operating conditions should only open the upstream line to supply the gas-liquid cylinder. Valve with double cut-off and bleed (DBB) function, the ball valve in both the switch can achieve double-off with the discharge function. When the valve is closed, downstream of the valve is safe for pipeline maintenance and other operations. Shock's fully welded valves require no pressure equalization holes on the ball, and DBB on the valve opening for easy checking of valve seat seals. The valve body can be self-unloading pressure chamber, and each side can withstand full pressure, valve body and seat support with the hole surface plated with PTFE. 2.4 Analysis of the implementing agency The valve adopts gas-liquid linkage actuator to drive the valve stem, the valve stem drives the ball to rotate between 90 ° so as to achieve the purpose of switching valve. The implementation of the fork drive mechanism, the basic principle is that the control system by controlling the solenoid valve switch, the introduction of external gas into the gas-liquid storage tank, the gas to hydraulic oil as the media to promote the action of the piston in the hydraulic cylinder connected to the piston The connecting rod pushes the fork movement, the fork is nested on the valve rod to drive the valve rod to move, so that the reciprocating motion completes the valve switch. The implementing agency can achieve local, remote control and have ESD capabilities. 2.5 Burst Protection System Analysis Burst protection system is essentially a small remote control terminal unit (RTU) that monitors changes in pipeline pressure and automatically controls the valve to close. The main function is to control the valve actuator to close the valve to prevent the pipe burst event by continuously monitoring the pipeline pressure changes, detecting the rate of change of pipeline pressure reaches the set value or the pipeline pressure exceeds the set value. Valve pressure drop is when a burst pipe accident occurs, when the natural gas pipeline quickly dropped to a pressure value, the valve actuator can quickly close the valve to ensure that there is no large amount of natural gas leaks, and then to avoid causing major accidents A kind of protection. Pipeline pressure drop value of the selection, it is necessary to avoid the case of pipeline start-stop caused by the compressor valve closing error behavior, but also to ensure that when there is pipe burst case, the valve can respond quickly. For example, the electronic control unit of the valve (electronic squib protection) sets the pressure drop to 5 bar / min. The valve will close automatically when the pressure drop in the line is greater than or equal to this value. 3 SCHUCK valve maintenance (1) routine maintenance. (1) Maintain seat sealant system; (2) Fill the required amount of grease with a lower grease pressure; (3) Check for signs of corrosion or paint and coating damage; (4) Then to fully open cycle valve operation, repeated this step several times, in order to spread the grease evenly, and to ensure that the valve can be easily rotated. If you do not have a full cycle of operating conditions, the general implementation of half-cycle, that valve body rotation 15 ~ 30 °. (2) full maintenance. ①detergent to clean the old grease or sealing grease. After pouring into the emptying of cleaning agent, the valve cycle operation, the cleaning agent spread out on the sealing surface, the cleaning agent can stay in the valve soak for 1 to 2 days; ② the ball valve is in the closed position, open the valve body drain or vent vent to reduce Valve cavity pressure; ③ close the valve body drain and vent, according to the need to inject cleaning agent, repeat the cycle switch valve; ⑤ grease or sealing grease, cycle valve to ensure flexible valve operation; ⑤ body vent, test valve Seat seal, if the seat is still leaking, adjust the position of the ball; ⑥ seat seat leakage still does not stop after adjusting the position of the core, re-injection of sealant for testing.