Swing Check Valves · Purchase-decision comparison
Forged swing vs lift check valves (small bore)
Both executions are forged small-bore check valves for high-pressure non-return duty — the decision is how the disc closes: a hinged swing disc or a lifting piston. This table compares the two executions we publish specification pages for, using only fields that mean the same thing and are collected on the same basis for both. Where a figure is not established by the collected evidence, the cell says so and asks you to confirm it at RFQ.
Last updated: 2026-11
Comparison table
A row appears only where the field means the same thing and is collected on the same basis for both columns. A cell without collected evidence says "confirm at RFQ" — it is never filled with an assumption, and it never implies either execution cannot be supplied.
Quick decision
These conclusions apply to the two executions compared on this page — not to the swing check valves family as a whole. Other executions of the same family differ, and any value marked "confirm at RFQ" is settled by the quotation, not by this table.
- High class from the start (Class 800–2500) with a standards basis you can cite → forged steel swing check.
- Compact piston stroke, per-construction dimension tables, ratings down to Class 150 and up to 4500 → compact forged lifting check.
- Both run the DN15–DN50 small-bore band — the closing element and the documentation basis are the decision; unverified figures are confirmed at RFQ.
| Field | Forged Steel Swing Check Valve | Compact Forged Lifting Check Valve |
|---|---|---|
| Working principle | ||
| Closing element The defining difference of the comparison: what moves to close the valve. | Swing — a hinged disc swings away from the seat under forward flow and swings back to close | Lift — a piston-type disc with a short, positive lifting stroke inside a forged piston-type body |
| Ratings & size | ||
| Size range Same small-bore band, different notation on the two collected pages. | DN15 to DN50 | NPS 1/2"~2" (DN15~DN50) |
| Pressure rating The rating spans differ: the swing page starts at Class 800; the lift page covers Class 150 through 4500 including PN equivalents. | Class 800 to Class 2500 | ASME Class 150~4500 (PN16~PN760) |
| Materials | ||
| Body materials Same meaning, different basis: the swing page lists forged grades (A105 family); the lift page lists material families out to nickel-base and titanium without specific grades. | A105, F22, F304L, F316L | Carbon steel, stainless steel, alloy steel, duplex stainless steel, nickel base, titanium alloy steel |
| Connections & operation | ||
| End connections The same connection families, grouped differently on the two pages: the swing page groups by end type with standards, the lift page lists RF/BW/RTJ/SW/NPT directly. | Buttweld, Socketweld, Flanged (socket-weld per ASME B16.11, screwed per ASME B1.20.1, flanged per ASME B16.5) | RF, BW, RTJ, SW, NPT |
| Standards & duty | ||
| Design standards The swing page states its standards basis; the lift page states API 602 in its identity text but collects no design-standards list field. | API 602, BS 5352, ASME B16.34 | API 602 stated in the page identity text; no collected design-standards field — confirm the standard basis at RFQ Conditional — confirm at RFQ |
| Testing standard Collected for the swing execution only. | API 598 | Not established by the collected evidence — confirm at RFQ Unverified — confirm at RFQ |
| Face-to-face basis The swing page collects one standard; the lift page collects per-class, per-construction dimension tables instead of a single standard basis. | ASME B16.10 | Collected as dimension tables per class and construction (bolted/welded cover, pressure-seal, Y-pattern, flanged B16.10 execution at Class 150/300/600) — no single collected standard basis; confirm against the piping standard at RFQ Conditional — confirm at RFQ |
| Dimension & weight data The lift page publishes full per-class tables (end-to-end, bore, weight, centre-to-top); the swing page does not. | Not established by the collected evidence — confirm at RFQ Unverified — confirm at RFQ | Per-class tables collected — e.g. Class 800 bolted/welded cover end-to-end from 76 mm (NPS 3/8) to 170 mm (NPS 2), with bore and weight columns |
- Specified
- Differs — read the note
- Unverified — confirm at RFQ
- Conditional — confirm at RFQ
How to choose
Choose forged steel swing for cited-standards high-class duty
The forged steel swing check is the forged-body, small-bore swing execution whose collected page states the full standards basis — API 602, BS 5352 and ASME B16.34 design, ASME B16.10 face-to-face, API 598 testing — over DN15–DN50 at Class 800–2500. It fits small-diameter, high-pressure lines such as seal injection, chemical injection, boiler and sampling service, where the bore is too small for cast construction to be economic. Pick the trim against the medium: F22 for hot service, F304L/F316L for corrosive media.
Choose compact lift for piston-stroke non-return with a wide rating envelope
The compact forged lifting check is the small-bore, high-pressure piston-type execution covering NPS 1/2–2 (DN15–DN50) at ASME Class 150–4500. Its collected page documents four constructions — bolted-cover, welded-cover, Y-pattern welded-bonnet and pressure-seal-bonnet, plus a flanged ASME B16.10 execution at Class 150/300/600 — with full per-class dimension and weight tables, so line-layout work can be done straight from the published tables. Body families run out to duplex, nickel-base and titanium alloys, with RF, BW, RTJ, SW and NPT ends for instrument-grade pipework through flanged installations.
The documentation basis is part of the decision
These two executions overlap on bore but not on documentation style: swing gives you one cited standard per dimension; lift gives you tables per class and construction. If your project requires a citable standards basis on every line item, that favours the swing execution; if you need the exact per-class dimensions to lay the line out, the lift tables carry it. Either way the requirement is stated on the RFQ, not assumed from this page.
Frequently asked questions
Swing disc or lifting piston — which closing element suits my line?
They close differently and that drives the fit. The swing check uses a hinged disc that swings away from the seat under forward flow — a simple, low-restriction motion suited to general high-pressure isolation of small bore lines. The lift check uses a piston-type disc with a short, positive lifting stroke, which is why the compact execution is selected where compact high-pressure lines need non-return protection with a short, positive piston stroke — instrument-grade pipework, injection and sampling duties. Orientation and flow pattern are confirmed against your piping layout at RFQ; the collected pages do not state an orientation rule.
Both are DN15–DN50 — so how do the ratings differ?
The bands sit differently. The forged steel swing page starts at Class 800 and runs to Class 2500 — it is aimed at small-diameter, high-pressure lines where the bore is too small for cast construction to be economic and the class is too high for standard cast swing checks. The compact lift page covers ASME Class 150 through 4500 (PN16–PN760), so it reaches both below the swing band and far above it, with the construction changing along the way — bolted or welded cover for general service, pressure seal bonnet toward the top of the envelope.
Why do some cells say "Unverified — confirm at RFQ" or carry a conditional state?
This page only states figures the collected evidence supports. The two source pages document their executions differently: the swing page states a compact standards basis (API 602, BS 5352, ASME B16.34, B16.10, API 598), while the lift page documents itself through per-class, per-construction dimension tables. Where a field exists on one page only — testing standard, dimension tables — the other side is marked rather than filled from general knowledge. Attach your standard requirements to the RFQ; the missing figures are confirmed in the quotation.
Individual execution specification pages
Each execution compared above has its own page — full specification table, selection guidance and RFQ details.
Ordering & documentation
Documents
Ask for the documentation set with the inquiry — typical items (material certificates, test reports to the listed inspection standard, dimensional drawings) are confirmed and supplied with the quotation.
Quotation
Send the medium, temperature, pressure, size and connection for a quotation-ready inquiry. Lead time, MOQ and price are confirmed at quotation, together with the documents to be supplied with the order.
Sample & supply
Supply terms, order quantities and lead time are agreed per order — state the destination country and required schedule with the inquiry.
Storage & shipping
Store valves with seats and seals protected from UV, ozone and deformation, and keep end-face protectors on until installation; storage limits and shipping arrangements for the selected materials are confirmed at quotation.
Request a quote
Send size, pressure class, set pressure and service conditions for a quotation-ready inquiry — the execution is confirmed against figures, with documents and terms.
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