1. When the valve is lifted, the rope should not be attached to the hand wheel or the valve stem to avoid damage to these parts and should be attached to the flange. 2, before installation, the valve should be checked, check the specifications and models to identify damage, especially for the valve stem. Also turn a few times to see if it is skewed, because it is most likely to hit the valve stem during transportation. Also remove debris from the valve. Stainless steel valve 3. When installing the flanged pneumatic valve, pay attention to tightening the bolt evenly and symmetrically. The valve flange and the pipe flange must be parallel and the clearance is reasonable to avoid excessive pressure or even cracking of the valve. Pay particular attention to brittle materials and valves that are not strong enough. The valve to be welded to the pipe shall be spot welded first, then the closing member shall be fully opened and then welded. 4. When installing the screw valve, the sealing packing (line hemp plus lead oil or Teflon raw material belt) should be wrapped on the pipe thread and not in the valve to avoid the valve memory and affect the circulation of the medium. 5. For the pipeline connected to the valve, it must be cleaned. Compressed air can be used to blow off debris such as mud sand, iron oxide chips, and welding slag. These debris not only easily scratch the sealing surface of the valve, but also the large particles and debris can block the small valve and make it invalid. Disc Springs are conical annular discs that bear axial in and out, generally with constant disc thickness and uniform load distribution on the inner edge of the upper surface and the outer edge of the lower edge. Disc springs are usually made of spring steel and can withstand static loads, non-alternating loads, dynamic loads, and can meet strict fatigue life and loading loss requirements Compression Spring,Compression Disc Spring,Disc Spring Washer,Compression Spring Washers Ningbo FLK Technology Co., Ltd. , https://www.flk-global.com