Wood Cutting Alignment Laser Module
Desheng offers stable industry laser modules, using high quality import laser diode, working with independent research control circuits with stable performance, and high-accuracy optics lens, to ensure the consistency and reliable quality.
Wood cutting alignment laser module marks the visible operating point on cutting machine. It helps to achieve the optimum work result and save material & time.
Wood Cutting Alignment Laser Module,Laser Diode Module,Laser Industrial Locator,Laser Line Pattern Module Changshu Desheng Optics Electronics Co.,Ltd , https://www.ray-lasertech.com
Pump outlet check valve selection, installation, protection measures
1. Pump outlet check valve "check valve selection General pumping station project situation, the pump outlet check valve selection, should follow the following principles; the pump outlet pipe diameter smaller pipeline, that DN Pump outlet pipe diameter DN & 50mm pipeline should be used Swing check valve Swing check valve can be installed horizontally or vertically Swing check valve disc for rotation around the axis of rotation, the general fluid resistance Less than the lift check valve, it is suitable for larger diameter occasions, the installation position is not limited, usually installed in the horizontal pipe, it is suitable for larger diameter occasions.According to the number of valve flap can be divided into single valve Kai Type, dual-valve swing-type and multi-valve swing three single-valve swing check valve is generally used and medium-caliber occasions large-diameter pipe selection single-flap swing check valve, to reduce Water hammer pressure, it is best to use to reduce the water hammer pressure slowly closing check valve. Double-flap swing check valve for medium and large diameter pipe. Double-flap swing check valve Small structure, weight Light, is a faster check valve; multi-valve swing check valve for large diameter Pipe 2. Pump outlet check valve installation â‘ Swing check valve is generally installed on the horizontal pipe: For the check valve DN ~ 80mm diameter, can also be installed in vertical or upward tilt pipe. â‘¡ Straight through Vertical lift check valve should be installed on the horizontal pipe; vertical lift check valve must be installed in the vertical pipe, the medium flow from bottom to top â‘¢ Check valve is easy to damage, so should be installed near the pump outlet Check valve, the upper part of the check valve is provided with a shut-off valve (usually with a ball valve or gate valve), easy access. â‘£ In order to facilitate the relief valve before the release of pressure relief for the check valve itself does not take the net valve, Back to the valve and shut-off valve installed between the relief valve with a clear net 3. To prevent the hydraulic impact on the check valve seal surface damage protection measures Check valve settings, played to prevent the material backwards to avoid liquid pump impeller hit However, the check valve itself, improperly set, will result in a water hammer caused by the valve flap suddenly hit the valve seat, damage to the check valve sealing surface.Therefore, should take a few protective measures .1, For the pump outlet Set> 80mm swing check valve, horizontal installation should be used to weaken the valve back seat and the impact generated. 2, for the pump outlet check valve diameter> = 150mm of the pipeline should be before and after the check valve Set the bypass to prevent the valve before the pressure rise is too high, the sealing surface of the check valve damage caused 3, the pump discharge line at the beginning and end of the pipeline pressure is higher, not allowed to set the bypass can take the following measures. Set the safety valve instead of the bypass valve.It acts like a bypass valve.It is located near the check valve outlet, when the water hammer to make the pressure rise, part of the water can be released to prevent the pressure continues to increase the damage caused by setting the air Or inert gas buffer tank, which is located near the outlet of the check valve and is compressed by the pressurized gas in the buffer tank when the water hammer is generated to relieve the pressure rise caused by the water hammer.