Briefly describe the disassembly and assembly methods of stainless steel accessory gate valves and globe valves
　　Answer: The disassembly methods of gate valves and globe valves are as follows:

　　(1First, use a brush to clean the dirt on the outside of the valve, mark the positions of the valve cover and the valve body, and then place the valve in the open position.

　　(2Press the valve flat on the rubber pad on the ground, remove the valve cover nut, and take the handwheel, valve stem, valve cover and gate (valve disc) off the valve seat together.

　　(3Remove the valve plate latch to separate the valve plate from the valve stem, and place it with the side of the copper ring contact surface (valve core) facing up.

　　(4Remove the packing gland nut on the valve cover, and rotate the handwheel clockwise to disengage the valve stem from the valve stem nut.

　　(5Remove the packing from the stuffing box.

　　Assemble the repaired valve components properly. The assembly is generally in the reverse order of disassembly:

　　(1Insert the valve stem into the packing gland and the valve cover, and align the upper end of the valve stem with the nut opening of the valve stem bushing. Then, rotate the handwheel counterclockwise to extend the valve stem out of the bushing nut.

　　(2First, place the gate flat on the workbench (lined with soft materials such as asbestos board), and then center the valve(Place the wedge iron and the lower end of the valve stem in the middle of the gate plate, then fasten the other gate plate and hold the neck of the gate plate with stainless steel wire clips.

　　(3Place the gasket between the valve cover and the valve body properly. Then, insert the valve cover, valve stem and gate into the valve seat together, mark them properly, and tighten the bolts symmetrically and evenly (at this time, the valve should be in the open position).

　　(4When packing is added to the stuffing box, the size of the packing should be appropriate, neither too large nor too small, and it should be cut at the interface of the packing45°Slope. When butt or lap the packing, the packing should be placed on the valve stem to make the interface fit, and then gently embedded into the packing box. The interfaces of adjacent two turns should be staggered90°-180°When filling the stuffing box with packing, it should be done each time1-2Press the ring tightly with the cover once. Do not fill it up at once and then press it again. Do not fill the stuffing box to the brim; leave some space3-5mmKeep a certain distance and leave room for heat tightness. Rotate the valve stem to open the valve and adjust the tightness of the gland bolts according to the magnitude of the force applied.

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