Class 150LB Cast Steel Swing Check Valve (H44H) — WCB / CF8 / CF8M, Bolted Bonnet, RF/BW, 2"–36"

This Class 150LB cast steel swing check valve is the H44H bolted bonnet design with a swing disc and metallic seating surfaces. The body is ASTM A216 WCB cast carbon steel, A351 CF8 cast 304 stainless steel or A351 CF8M cast 316 stainless steel, with seat and disc sealing surfaces available as Trim 1 (13Cr), Trim 5 (STL), Trim 8 (13Cr + STL), CF8/304 or CF8M/316. Flanged ends are to ASME B16.5 raised face (RF); butt-weld ends are to ASME B16.25. Sizes run from NPS 2" to NPS 36". The valve is API 598 / API 6D tested and is widely specified for water, oil, gas, chemical, food-grade and general utility service.

Application

This Class 150 swing check valve is specified in water supply and distribution, oil and gas gathering, refinery and petrochemical utility lines, chemical and food-grade piping, HVAC and general industrial service. The swing disc provides low pressure drop in the forward direction, the bolted bonnet allows inline inspection of the disc, arm and seat at Class 150, and the metal seat resists erosion at moderate differential pressure. WCB is the standard carbon steel selection for non-corrosive service; CF8 is used for mildly corrosive, food-grade and pharmaceutical service; CF8M is used for chloride-bearing, marine and chemical service. For sour service the valve can be supplied to NACE MR0175 / ISO 15156 on request.

Standards

Design and manufacture: Cast steel check valve according to BS 1868, ASME B16.34 and API 6D; forged steel check valve according to API 602.
Inspection and test: API 598 or API 6D.
End flange dimension: ASME B16.5 (for NPS ≤ 24); ASME B16.47 series B, API 605 or ASME B16.47 series A / MSS SP-44 (for NPS > 24).
BW end dimension: ASME B16.25.
Face to face and end to end: ASME B16.10.
Pressure-temperature ratings: ASME B16.34.
Shell wall thickness: API 600 and BS 1868.

Quick Details

1. Type: Swing check valve, cast steel
2. Design: Bolted bonnet, swing disc
3. Size Range: 2" to 36" (DN50 to DN900)
4. Pressure Rating: ASME Class 150LB / 150#
5. End Connections: Flanged RF (ASME B16.5), butt-weld BW (ASME B16.25)
6. Body Material: ASTM A216 WCB, A351 CF8, A351 CF8M; C5, C12, 4A, 5A on request
7. Various trim materials available to suit service conditions
8. NACE MR0175 on request

Selection Notes: Bolted Bonnet at Class 150, WCB vs CF8 vs CF8M, and RF/BW Face-to-Face

Bolted bonnet at Class 150: at Class 150, the internal pressure acting on the bonnet is low, so the bolt load required to hold a bolted bonnet against the pressure and the gasket seating load is modest. A bolted bonnet is therefore the standard and most economical construction at Class 150, and it allows the bonnet to be removed for inline inspection of the disc, arm and seat. Pressure seal bonnets are normally reserved for Class 900 and above, where the bolt load of a bolted bonnet would become impractically large.

WCB vs CF8 vs CF8M: WCB (ASTM A216 cast carbon steel) is the standard selection for non-corrosive water, oil, gas and utility service, and is the most economical option. CF8 (ASTM A351 cast 304 stainless steel) is specified for mildly corrosive media, food-grade and pharmaceutical service, and where carbon steel would rust or contaminate the fluid. CF8M (ASTM A351 cast 316 stainless steel) is specified for chloride-bearing, marine and chemical service where the molybdenum addition in 316 gives better pitting and crevice corrosion resistance than 304. For elevated temperature, C5 and C12 chrome-moly bodies are available on request.

RF and BW face-to-face: in ASME B16.10, the Class 150 face-to-face dimension for flanged (RF) swing check valves and the end-to-end dimension for butt-weld (BW) swing check valves are the same for the same NPS. This is why the L (RF) and L (BW) columns in the Class 150 table show identical values. The two columns are kept separate so that the table can be read directly against a line schedule that specifies either RF or BW ends, and so that the same table can be extended to other classes where RF and BW dimensions differ.

Features

1. General
Bolted bonnet;
Swing disc;
Metallic seating surfaces.

2. Body and Bonnet Connection
Class 150LB check valves are usually supplied with a bolted bonnet.

3. Cover Gasket Style
Stainless steel + flexible graphite wound gasket is used for Class 150LB check valve;
Metal gasket is also optional for Class 150LB check valve.

4. Seat
For carbon steel check valve, the seat is usually forged steel. The seat sealing surface may be spray-welded with hard alloy if specified by the customer. For stainless steel check valve, an integral seat is usually adopted, or it can be machined integrally after hard alloy welding. The threaded or welded type seat is also optional for stainless steel check valve if requested by the customer.

Swing Check Valve Parts and Material List (Class 150LB)

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Parts No. 1 Body: original source had "ASTM A216WCB" — corrected to "ASTM A216 WCB". Parts No. 2 Seat Ring: original source had "A105+STL" — corrected to "A105 + STL". Parts No. 3 Disc: original source had "ASTMA216WCB+13Cr" in two columns — corrected to "ASTM A216 WCB + 13Cr". Parts No. 4 Arm and No. 12 Bonnet: original source had "ASTM A216WCB" — corrected to "ASTM A216 WCB". Parts No. 8 Bonnet Nut: original source had "ASTM A1948" in the CF8 column — corrected to "ASTM A194 8". Parts No. 9: original source had "Bon net bolt" — corrected to "Bonnet Bolt". Parts No. 11 Gasket: original source had "304SS +Graphite" and "316SS +Graphite" — corrected to "304SS + Graphite" and "316SS + Graphite". Eye Bolt is listed as ASTM A181 in all five columns as in the original; confirm against the material certificate — eyebolts are often supplied in A36 or A193 B7.

Main Connection Dimensions — Class 150LB (mm)

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Dimensions in mm. L = face-to-face (RF) or end-to-end (BW) per ASME B16.10. In ASME B16.10 Class 150, the RF and BW dimensions are identical for the same NPS, so the two L columns show the same values; both are kept so the table can be read directly against a line schedule that specifies either end. RF flange dimensions per ASME B16.5 for NPS ≤ 24; ASME B16.47 series B or API 605 for NPS > 24. f = raised face height (1.6 mm for Class 150 RF). NPS 22, 32 and 34 are not listed in the original Class 150 dimension series. The dimension series on this page runs through NPS 36, which matches the size range in the page title.

Frequently Asked Questions