Check valves smaller than DN50, vertical pipes

The medium flow direction is from bottom to top; a swing-type valve can be used

Installation requirements for check valves: Classified by structure, check valves can be divided into lift-type check valves, swing-type check valves, and butterfly check valves. Lift-type check valves can be divided into vertical and straight-through types... 1. Straight-through lift check valves can be installed in both horizontal and vertical pipes ； 2. For the inlet pipeline of the water pump, a foot valve is recommended; such valves are generally installed only on vertical pipes at the pump inlet, with the fluid flowing from bottom to top ； 3. The lift-type type has better sealing performance than the swing-type, but it presents greater fluid resistance; the horizontal type is suitable for use in horizontal pipelines, while the vertical type is suitable for use in vertical pipelines ； 4. The installation location of the swing check valve is not restricted; it can be installed on horizontal, vertical, or inclined pipelines. When installed on a vertical pipeline, the flow direction of the medium should be from bottom to top ； 5. The installation location of the butterfly check valve is not restricted; it can be installed on horizontal pipelines as well as on vertical or inclined pipelines ；

It’s relatively small – is a swing-type model okay?

Is it okay to use the lift-type method? It has to be a horizontal pipe, right?

I have another question: is there a type such as H42 in American standards? What standard does it correspond to?

Use the national standard to adjust the flange center hole spacing

Horizontal lift or vertical lift check valves can be used