A swing check valve opens under forward flow and closes as flow falls or reverses. It is an automatic non-return valve, not a positively actuated isolation valve. The catalogue identifies a flanged Class 150 arrangement; the supplied body, trim and seat materials must be specified separately.

Class 150 is not a 150 psi maximum

Class is a rating designation, not a direct pressure conversion. Select the required class, size and material, then check the pressure-temperature rating and flange dimensions for the complete assembly.

Check installation and transient conditions

Provide the proposed orientation, flow direction, normal and minimum flow, reverse-flow conditions and pump start/stop sequence. Confirm disc travel clearance and the permitted installation orientation in the selected valve instructions. If slam or water hammer is a concern, assess the system transient and valve response; the words swing check do not establish non-slam performance.

Frequently asked questions

Can this check valve replace a manual shut-off valve?

No. Its closing action depends on flow conditions. Provide a separate, suitable isolation arrangement where the process requires positive isolation.

Will it eliminate water hammer?

Not necessarily. Supply pump shutdown and reverse-flow information so that the valve closing response and system transient can be reviewed together.

Can I install it vertically?

Confirm the permitted orientation and flow direction for the offered construction. A catalogue photograph is not an installation instruction.

General technical references—not product certificates: ASME valve rating scope · ASME flange rating scope

Prepare a quotation for this valve

For pump or process-line backflow protection, submit the flow and transient information as well as the flange size.

Process data: Fluid, temperature, pressure, normal/minimum flow and foreseeable reverse flow.
Pipeline layout: Orientation, direction, nearby fittings, available disc clearance and pump start/stop arrangement.
Acceptance: Required leakage criteria, inspection documents and any slam or transient constraint.

Documents to agree before supply

Drawing identifying the permitted orientation and disc clearance
Material and pressure-temperature documents for the offered assembly
Agreed inspection and leakage-test scope

Ask which documents are available for the offered configuration and agree their scope before supply. A catalogue picture is not a certified drawing or test report.