Sheet 26/77Products / Valves and process equipment / Swing check valveRev
Valves and process equipment · catalogue item
Swing check valve
Self-acting valve with a hinged disc that opens with forward flow and closes to stop reverse flow.
In short
Self-acting valve with a hinged disc that opens with forward flow and closes to stop reverse flow. JJ Projects sources it to the specification the buyer names. Typical reference, standards: API 594, API 6D (pipeline), API 602 (compact), ASME B16.34.
Specification references
Typical references only. The governing specification is the one on your purchase order or datasheet.
| Property | Typical reference |
|---|---|
| Standards | API 594, API 6D (pipeline), API 602 (compact), ASME B16.34 |
| Testing | API 598 |
| End connections | Flanged, butt-weld, threaded or socket-weld |
| Types | Swing and lift check |
Specification references describe what the order names, not a certification held by JJ Projects.
Valves and process equipment
Typical uses
- 01Preventing reverse flow on pump discharge lines
- 02Protecting compressors and other equipment from backflow
- 03Headers and branches where flow may reverse when a source stops
- 04Water, oil and gas lines in process and pipeline service
What to include in a request
A request with these details can be quoted without a round of questions. Send what you have and we will ask for the rest.
- 01NPS and pressure class, or the design pressure and temperature
- 02Standard: API 594, API 6D for pipeline valves, API 602 for compact valves, or the one your specification names
- 03Type: swing check or lift check, and single disc or other design if specified
- 04Installation: horizontal line, or vertical with upward flow, since the design depends on it
- 05Body and trim materials, for example carbon steel with 13Cr trim
- 06End connections: flanged, butt-weld, threaded or socket-weld
- 07Service fluid, testing such as API 598, and the documents required
Valves and process equipment
Related items
- 01Gate valveSteel gate valves to API 600, API 602 and ASME B16.34, tested to API 598, with the specification references and what a gate valve request should include.Learn more
- 02Ball valveQuarter-turn ball valves to API 608 and API 6D with ASME B16.34 ratings, two-way or three-way, and what to include in a ball valve request to quote.Learn more
- 03Centrifugal pumpCentrifugal process pumps to API 610 and ASME B73.1, supplied to your datasheet, and what a request needs: fluid, flow, head, NPSH available and materials.Learn more
- 04Globe valveGlobe and angle valves in steel to BS 1873, API 623 and API 602 with ASME B16.34 ratings, and what to include in a globe valve request so it can be quoted.Learn more
All valves and process equipment
Guides
Guides
- 01Valve types and standards: API and ASME B16.34Gate, globe, ball, check, butterfly and needle valves: what each does, which standards apply (API 600, 602, 6D, 608, 594, B16.34) and how to choose.Learn more
- 02Flange pressure classes: ASME B16.5 and B16.47How ASME flange classes 150 to 2500 work: B16.5 vs B16.47, pressure-temperature ratings, facings RF, FF and RTJ, flange types and common materials.Learn more
- 03Material test reports (MTRs) and EN 10204What a material test report contains, how EN 10204 types 2.1, 2.2, 3.1 and 3.2 differ, what heat numbers mean, and what to check against the purchase order.Learn more
Questions
Questions
01What is the difference between a swing check and a lift check valve?
A swing check valve has a hinged disc that swings clear of the flow, so it has low pressure drop. A lift check valve has a disc that lifts straight up from the seat, which can give tighter shutoff but a higher pressure drop. Lift check valves are generally for horizontal lines.
02Does a check valve prevent water hammer?
Not by itself. A check valve that closes late lets the flow reverse before it slams shut, which can cause surge. Surge control is a design question for the piping engineer. The valve type and closing speed are part of that analysis.
03Where does the check valve go on a pump line?
On the discharge, between the pump and the isolation valve, so the check valve protects the pump and the isolation valve can be closed to service it. Your piping design shows the exact arrangement.
Send the specification. We will take it from there.
A material list, a drawing or a single line: tell us what the project needs and where it is going.