API 600 Flanged Cast Steel Gate Valve — A216 WCB, Class 150, Rising Stem (NPS 2"–48")

A gate valve, also known as a sluice valve, is a valve which opens by lifting a round or rectangular gate/wedge out of the path of the fluid. The flanged cast carbon steel gate valve described on this page is the API 600 rising stem (OS&Y) bolted bonnet design in ASTM A216 WCB, rated ASME Class 150, and is supplied in sizes from NPS 2" to NPS 48".

Standards

Design and Manufacture: Cast steel gate valve to API 600 or API 6D.
Inspection and Test: API 598, API 600 or API 6D.
End flange dimension: ASME B16.5 (for NPS ≤ 24).
Face to face and end to end: ASME B16.10.
Pressure-temperature ratings: ASME B16.34.

Quick Details

1. Type: Flanged Gate Valves
2. Design: OS&Y, Bolted Bonnet, Solid or Flexible Wedge Design
3. Size Range: 2" to 48"
4. Pressure Ratings: ASME Class 150 / 150#
5. Materials Available in: Cast Steel A216 WCB
6. Various trim materials are available to suit different service conditions
7. Actuator: Manual, Handwheel
8. NACE MR 0175 on request

Selection Notes: Trim, Sour Service and End Connections

This API 600 WCB gate valve is commonly specified for steam, water and non-corrosive hydrocarbon service at Class 150 ratings. For sour service, NACE MR0175 / ISO 15156 compliance is available on request; the H₂S partial pressure, operating temperature and CO₂ content from your line conditions are needed to confirm the correct material and hardness specification.

Trim 1 (13Cr seat and 13Cr wedge) is the standard selection for general service. Trim 5 (Stellite on seat and wedge sealing surfaces) is preferred where higher erosion and wear resistance is required, such as throttling duty or high-velocity lines. Trim 8 (13Cr wedge with STL seat) offers a middle-ground specification frequently requested in refinery and petrochemical line schedules. All three trims share the same A216 WCB body, A182 F6a stem and A439 D2 stem nut.

RF flanged ends per ASME B16.5 are standard for NPS 24 and smaller, with face-to-face dimensions to ASME B16.10. Butt-weld ends are available for larger sizes or where welded connections are specified; RTJ and other facing options can be quoted on request.

Features

1. Bonnet Gasket Style
Stainless steel + flexible graphite combined gasket is used for Class 150 gate valve.

2. Packing Seal
As usual, flexible graphite is used for packing material. PTFE or combined packing material can also be used if requested by the customer.

3. Body and Bonnet Connection
Class 150LB gate valves are usually connected with bolted bonnet design.

4. Disc Design
NPS ≥ 2 gate valves are flexible wedge gate.

5. Seat
For carbon steel gate valve, the seat is usually forged steel. The seat sealing surface is overlay welded with hard alloy specified by the customer. For stainless steel gate valve, the seat is integral with body, or it can be machined directly after hard alloy welding.

6. Backseat Design
All gate valves have backseat design. In most cases, the carbon steel gate valve is fitted with a renewable back seat. For stainless steel gate valve, the back seat is machined directly in the bonnet or machined after welding.

7. Stem Design
The stem is integral forged design. The minimum diameter of the stem shall be as per the standard requirement.

8. Stem Nut
Usually, the stem nut is made of ASTM A439 D2. It can also be made of copper alloy or other materials if requested by the customer.

9. Operation
Hand wheel or bevel gear box is usually used for gate valve operation.

Flanged Cast Steel Gate Valve Parts and Material List (Class 150LB)

Main Connection Dimensions — Class 150LB (mm)

Dimensions in mm. L = face-to-face (RF) / end-to-end (BW) per ASME B16.10. RF flange dimensions per ASME B16.5 for NPS ≤ 24. For NPS 30 and 36 where two L values are shown, please confirm the applicable face-to-face series with our engineering team before ordering.

Frequently Asked Questions