24" Class 600 Cast Steel Gate Valve — A216 WCB, Stellite Facing, RF Flanged, Gear Operated

Application

This 24 inch Class 600 cast steel gate valve is specified for on/off isolation in water treatment, oil and gas production and gathering, petrochemical process lines and high-pressure utility service. The Stellite-faced seat and wedge provide the erosion and wear resistance required at Class 600 differential pressures, and the gear operator makes manual operation practical at 24 inch, where handwheel torque would otherwise be excessive.

Quick Details

1. Type: 24 inch Class 600LB gate valve
2. Design: OS&Y, bolted bonnet, flexible wedge design
3. Size: 24 inch (DN600)
4. Pressure Rating: ANSI 600LB / 600#
5. Body Material: ASTM A216 WCB cast carbon steel
6. Trim: Stellite (STL) hard-faced seat and wedge — Trim 5 / Trim 8 configuration
7. End Connection: RF flanged (ASME B16.5)
8. Operation: Gear operated (bevel gear box)
9. Special Requirement: NACE MR0175 on request

Selection Notes: Stellite Trim, Gear Operation and RF vs RTJ

Why Stellite trim at this size and class: at 24 inch and Class 600, flow velocity and differential pressure across the closed wedge are significantly higher than at Class 150. A 13Cr trim (Trim 1) that performs well at lower classes can suffer from erosion and galling at Class 600 duty. Stellite (STL) is a cobalt-chromium hardfacing alloy overlay-welded onto the seat ring and wedge sealing surfaces, providing much higher resistance to erosion and wear. This valve is supplied in either Trim 5 (STL on both seat and wedge) or Trim 8 (13Cr wedge with STL seat) configuration, depending on the line schedule.

Why gear operated at 24 inch: the torque required to open or close a 24 inch Class 600 gate valve against full differential pressure exceeds what an operator can reasonably apply by handwheel. A bevel gear box multiplies the input torque and reduces the number of handwheel turns, making manual operation practical. The gear box is supplied as standard on this valve; electric or pneumatic actuation can be quoted on request.

RF vs RTJ at Class 600: RF (raised face) flanged ends to ASME B16.5 are standard for NPS 24 at Class 600. For sour service or where a metal-to-metal seal is preferred, RTJ (ring type joint) ends are available on request. For sour service, NACE MR0175 / ISO 15156 compliance is available; the H₂S partial pressure, operating temperature, CO₂ content and chloride concentration are needed to confirm the material and hardness specification.

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); API 605 or ASME B16.47 series A / MSS SP-44 (for NPS > 24).
Face to face and end to end: ASME B16.10.
Pressure-temperature ratings: ASME B16.34.

Features

1. Bonnet Gasket Style
Stainless steel + flexible graphite wound gasket is used for Class 600 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 600LB gate valves are usually connected with bolted bonnet design.

4. Seat
For carbon steel gate valve, the seat is usually forged steel. The seat sealing surface is overlay welded with hard alloy (Stellite) 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.

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

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. At 24 inch Class 600, a bevel gear box is supplied as standard for torque reduction.

600LB Gate Valve Parts and Material List

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Trim 5 = Stellite on both seat and wedge. Trim 8 = 13Cr wedge with Stellite seat. Both configurations share the same A216 WCB body, A182 F6a stem and A439 D2 stem nut.

Main Connection Dimensions — Class 600LB (mm)

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Dimensions in mm. L = face-to-face (RF) / RTJ. RF and RTJ flange dimensions per ASME B16.5 for NPS ≤ 24; ASME B16.47 series A for NPS > 24. The 24" row (highlighted) is the size covered by this product page; the table is listed in full for reference when the same valve is specified in other line sizes.

Frequently Asked Questions