Frequently Asked Questions

Regarding the piping posture of the valve, it is not recommended to tilt the operating device (handle, gear operating device, pneumatic operating device, electric operating device, etc.) below the horizontal line. When the valve is tilted below the horizontal, foreign matter may accumulate in the gland part due to the effect of gravity. When the valve is opened and closed in this state, foreign matter may enter the packing due to the rotation of the stem, wear the packing and cause gland leakage. Therefore, please arrange the piping so that the operating device is above the horizontal as shown below.

Please refer to the FAQs below for restrictions on the piping posture and flow direction depending on the valve type.

・Is it possible to use a swing type check valve in vertical piping?
・Is it possible to use a lift type check valve in vertical piping?
・Is there any restrictions on the installation posture of a wafer type check valve?
・Is it possible to use a vertical lift type check valve horizontally?
・Tell me about the piping posture of a Y-strainer.

It is possible to use a swing type check valve in horizontal piping and vertical piping.
However, when installing in vertical piping, make sure that the fluid flow direction in the piping is from the bottom to the top and that the arrow of the casted display on the valve body is from the bottom to the top.

It is not possible to use a lift type check valve in vertical piping.
A lift type check valve can be used by installing it in horizontal piping only.
When installing the valve, be sure to install it with the cover facing the top.

A wafer type check valve has restrictions on the fluid flow direction and valve installation direction.
When installing the valve, pay attention to the following points and install it so that the direction of the arrow on the valve body matches the fluid flow direction.

・ Although the valve can be used in vertical piping, make sure that the fluid flow direction in the piping is from the bottom to the top and that the arrow on the valve body is also from the bottom to the top.
・When connecting a dual plate type (two disc type) product to horizontal piping, install it so that the bypass valve is positioned in a horizontal position.
・In the case of a single plate type (one disc type) product, install it so that the pin is positioned in the upper position. If it is installed at an angle other than horizontal, the disc may not fully close due to the influence of gravity.

Install a Y-strainer so that the screen faces downward.

・In the case of horizontal piping, connect the piping so that the cap or cover faces downward as shown in the figure.
・When the fluid is descending in vertical piping, connect the piping so that the cap or cover faces downward as shown in the figure. When the fluid is ascending, provide a horizontal piping section to connect the piping.

If the strainer is installed in the reverse position, foreign matter and dust may flow back into the primary piping, so it is not recommended.

A vertical lift type check valve cannot be used because the disc and seat may shift when closed.