Class 600LB Cast Steel Swing Check Valve (H44H) — WCB / CF8 / CF8M, Bolted Cover, RF/RTJ/BW, 2"–36"

This Class 600LB cast steel swing check valve is the H44H bolted cover 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 with raised face (RF) or ring type joint (RTJ) facing; 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 medium-high pressure water, oil, gas, chemical and general industrial service.

Application

This Class 600 swing check valve is specified on medium-high pressure oil and gas production and gathering, refinery and petrochemical process lines, water treatment and utility service, chemical and general industrial piping. The swing disc gives low pressure drop in the forward direction, the bolted cover allows inline inspection of the disc, arm and seat, and the metal seat resists erosion at high 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 cover, swing disc
3. Size Range: 2" to 36" (DN50 to DN900)
4. Pressure Rating: ASME Class 600LB / 600#
5. End Connections: Flanged RF / RTJ (ASME B16.5), butt-weld BW (ASME B16.25)
6. Body Material: ASTM A216 WCB, A351 CF8, A351 CF8M; LCB, CF3, CF3M, WC6, WC9, C5, C12, 4A, 5A or equivalent on request
7. Various trim materials available to suit service conditions
8. NACE MR0175 on request
9. Test and inspection: API 598 / API 6D

Selection Notes: Multi-Material Page vs WCB Page, Trim 1/5/8 Choice, and CF8 vs CF8M

Multi-material page vs WCB page: the carbon steel 600LB WCB page covers WCB bodies only, with Trim 1, Trim 5 and Trim 8 seating options. This page covers the same 2"–36" Class 600 valve with WCB, CF8 (304) and CF8M (316) body options in the same table, so carbon steel and stainless steel requirements can be compared side by side. Use this page when the project mixes carbon steel and stainless steel lines at Class 600, or when stainless steel is required; use the WCB page when the requirement is carbon steel only.

Trim 1 / Trim 5 / Trim 8: Trim 1 (13Cr seat ring and 13Cr disc sealing surface) is the standard selection for general non-corrosive service. Trim 5 (Stellite on both seat and disc sealing surfaces) is preferred where erosion and wear resistance is required. Trim 8 (Stellite seat with 13Cr disc) is a middle-ground specification frequently requested in refinery and petrochemical line schedules. All three trims share the same A216 WCB body, A182 F6a arm pin and A194 2H bolting.

CF8 vs CF8M: CF8 (ASTM A351 304) is specified for mildly corrosive media, food-grade and pharmaceutical service, and general stainless piping where chlorides are low. CF8M (ASTM A351 316) adds molybdenum and is specified for chloride-bearing, marine and chemical service where 304 would be susceptible to pitting and crevice corrosion. For non-corrosive service, WCB carbon steel is the standard and most economical choice.

Features

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

2. Body and Bonnet Connection
Class 600LB check valves are usually supplied with a bolted cover.

3. Cover Gasket Style
Stainless steel + flexible graphite wound gasket is used for Class 600LB check valve;
Metal gasket is also optional for Class 600LB 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 600LB)

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Main Connection Dimensions — Class 600LB (mm)

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Dimensions in mm. L = face-to-face (RF / RTJ) or end-to-end (BW) per ASME B16.10.

Frequently Asked Questions