How to Select a U Type Butterfly Valve for Your Piping System

Match the valve to the piping interfaces

Check the line flanges before reviewing the valve materials. Our U type butterfly valve uses flange dimensions aligned with EN 1092-2, BS 4504, and ASME B16.1. The top flange uses ISO 5211, and the face-to-face dimensions follow EN 558, ISO 5752, and DIN 3202.

These interfaces give a replacement project several points to compare. Measure the space between the existing flanges, identify the flange standard, and check the operating equipment connection. In a plant room, the valve may have enough room across the pipe run but insufficient access above the centerline for the gearbox or actuator. Include both the face-to-face space and top access in the purchase request.

The same check applies to a new line. Choose the flange arrangement first, then align the valve's face-to-face length and top-flange interface with the adjacent pipework and operating equipment. We can review the connection as one configuration when you provide the line standard and operating arrangement.

Narrow the seat choice with service conditions

NBR, EPDM, and PTFE are seat options for this valve. Treat their common service categories as starting points for selection, not as blanket approvals for every fluid. NBR may be considered for oil-based fluids, EPDM for water or steam service, and PTFE for highly corrosive chemical service. The final choice depends on the actual fluid, operating temperature, concentration, and cleaning conditions.

For a water project, begin the discussion with EPDM and send the treatment and temperature conditions. For an oil-handling line, send the oil description and operating range with an NBR request. For a chemical line, PTFE may be the starting option, but the chemical concentration and cleaning process still need to be reviewed for the selected configuration.

The O-ring options are NBR, EPDM, and Viton. Specify the O-ring together with the seat so the sealing materials are considered as a set. A purchase request that names only the valve size leaves an important configuration decision open.

Specify the body and internal parts

The body is offered in cast iron or ductile iron. The stem and pin are stainless steel. Disc options are ductile iron, aluminum bronze, and stainless steel. The bushing can be PTFE or aluminum bronze.

List each requested material separately on the technical schedule. This is useful for replacement planning, where the new valve may need to follow an existing material schedule, and for new projects, where the body, disc, stem, bushing, seat, and O-ring choices must be reviewed together.

The material schedule should follow the service description. Send the medium, temperature, concentration where relevant, cleaning method, and surrounding installation conditions with the requested body and wetted-component materials. We can then review the requested combination instead of treating cast iron, ductile iron, stainless steel, aluminum bronze, and PTFE as interchangeable choices.

Use the metric dimensional range for sizing

The dimensional table covers DN100 through DN1200. Use the DN value as the primary size reference, then check the listed H1, H2, and face-to-face dimensions for the selected valve. The table also separates DIN PN 10 and DIN PN 16 flange arrangements, with different PCD and bolt-hole data at some sizes.

For a replacement, record the existing DN, flange pressure arrangement, flange drilling, face-to-face length, and top mounting space. For a new installation, compare the selected L dimension with the pipe run and check H1 and H2 against supports, insulation, and nearby equipment. A nominal diameter match alone does not establish that the valve will fit the available space.

The dimensional range is especially important for large valves. DN1000 and DN1200 selections have different height and face-to-face values, so measure the centerline and top clearance before releasing the order. Send the required DN and pressure arrangement rather than describing the valve only as a large-diameter butterfly valve.

Put the design and inspection references into the request

Our valve design and manufacture follow API 609, EN 593, and BS 5155. The flange, top flange, and face-to-face interfaces use the standards listed above. Testing and inspection use API 598 and EN 12266.

Place these references beside the requested DN, PN arrangement, dimensions, and material schedule. This keeps the design, connection, inspection, and installation requirements in the same purchasing discussion. It also gives us the information needed to review the valve as a complete line component.

Questions to settle before release

Prepare the order around the line data

Choose our U Type Butterfly Valve when the piping project matches its flange interfaces, ISO 5211 top flange, DN100 to DN1200 dimensional range, and selectable sealing and component materials. Send the medium, temperature, concentration, cleaning method, DN, PN arrangement, flange standard, face-to-face space, top clearance, material schedule, and quantity for a quotation.