Toyota Forged Alloy Rims,Aluminum Alloy Wheels,Forged Alloy Wheels,Car Alloy Wheels NINGBO KINTOP AUTOPARTS CO., LTD. , https://www.kintopautoparts.com
High temperature and pressure stop valve valve power station technical conditions "two"
Manual shut-off valve, gate valve - by the handwheel, impact handwheel or gear-driven shut-off valve, gate valve; electric shut-off valve, gate valve - by the electric device-driven shut-off valve, gate valve. 5.7.1 The depth of stuffing box is 2 times of the stem diameter. When the stem diameter is 64mm and above, the deepest depth is 110mm. 5.7.2 Pressure self-sealing valve structure, the filler should be flexible graphite spiral wound gasket without joint filler. 5.8 Handwheel The handwheel used to operate the valve is to be turned clockwise, but the handwheel must be marked. 5.9 Electric device Electric valve configured electric device should be consistent with "DZ series valve electric device" requirement. 5.10 Assembly basic requirements 5.10.1 Where the assembly of zero, parts (including purchased parts, outsourcing) must hold proof of inspection and logo. 5.10.2 The main parts with the size and roughness should be re-examination, and optimize the combination. 5.10.3 parts of the assembly surface and the friction surface shall not affect the performance of the abrasion. 5.10.4 Where the assembly of zero, parts (including purchased parts, outer parts) shall not have burrs, corrosion and machining surface bumps, visual inspection after passing the spectral examination before assembly. 5.10.5 Fasteners should be fastened after assembly, not loose. Fastener assembly, the screws should be coated with heat-resistant Sikou fat. 5.10.6 manual valve, stem lift process may not have jam ashamed, feel evenly. 5.10.7 After the electric valve is equipped, the electric device should be adjusted to the travel switch with the valve fully open, closed position synchronization. Shut-off valve to torque protection device action based. Electric change manual, hand wheel rotation should be uniform. 5.10.8 After assembly, when the gate valve is closed, the center of the gate should be higher than the center of the valve seat, the value of single gate is 2/3 of the valve seat sealing surface width; the double gate is the valve seat sealing surface width of 1 /2. 5.11 rust, paint 5.11.1 derusting, painting should be carried out after the water pressure test, and the cavity of the water stains removed. 5.11.2 valve surface coating anti-grease, non-processing the outer surface of paint. 5.11.3 Before painting, it is necessary to clean the non-processed surface, apply a layer of red lead primer, and then apply a layer of paint. 6 Test Methods 6.1 Materials Test Valve material testing shall comply with the provisions of Article 5.2.2. 6.2 Water pressure test The entire hydraulic pressure test according to the provisions of Article 8.4, the shell strength test and seal, inverted seal test. 6.3 Type test 6.3.1 Is one of the following circumstances, the need for type testing: