Black Walnut Hardwood Flooring Black walnut floors are an excellent choice. The dark, rich chocolate colors of the hardwood and the lighter-colored sapwood combine to create a flooring surface that is both versatile and sumptuous. Prized by woodworkers for its gorgeous grain and colored features, solid Walnut flooring comes in colors that range from dark tan to chocolate brown with purple undertones in the heartwood, and lighter, creamier colors in the sapwood. Easily stained to a wide variety of colors, Black Walnut flooring is a highly versatile flooring option – it is equally at home in rustic country kitchens, contemporary city lofts, formal sitting rooms, and everything in between. KelaiWood , https://www.kelaiwooden.com
Roots vacuum pump pre-pump principle of matching
Normally, the principle of matching front-stage pump of Roots vacuum pump is as follows: 1. Pre-stage pump is required to pre-vacuum the main pump required. 2, the maximum allowable discharge pressure of the main pump, the former pump must discharge the maximum amount of gas discharged from the main pump in time, the former pump pumping speed in accordance with the actual pumping speed at the actual pumping speed. 3, doubles as pre-pumping pump to meet the pre-pumping time and pre-pumping vacuum requirements.