1. Preparation before shipping
The valve side channel and stem exposed surface are the key parts,should take the following measures:
(a)the inside of the valve shall be cleared of scale and keep the inner cavity clean and dry.
(b)the surface of the valve should be coated with anti-rust oil.
(c)the valve should prevent flange surface and other mechanical damage.
(d)the valve opening should be closed.
2. Handling
When handling valves should be properly noted, the valve must not be thrown or dropped, especially if the handwheel and stem should not be the lifting or suspension points of large valves.
3. Storage
The problem of storage should be the same as transportation preparation. But the time factor is very important, general butterfly valve of the deposit period, according to the expiration of the seal material to determine if be prolonging the valve a few weeks or months, you need to cost to improve the original storage conditions. Valves are normally stored indoors, and the actual temperature of the valve is always above the dew point temperature. lf the valve must be stored outside, it should be supported without contact with the ground and protected by a waterproof cover.
4.Test and adjust
When the valve is strictly inspected and installed, the valve should be in good working condition and can be operated at any time. However, the valve is at the end of a dangerous state. The performance of the operation is verified only through trial.
At this time, the stem seal should be checked to determine whether the packing is properly installed and the packing gland bolts are in the initial position. The additional adjustment amount should be determined according to the need to check the operating performance of the valve and introduce the medium pressure of the system. To observe through open-closed or closed-cycle operation. If there is no obvious problem, the actual test can be carried out while inspecting the sealing performance and operating performance.
