API 600 Gate Valve: Complete Guide to Specifications, Materials, and Applications

Quick Answer: What Is an API 600 Gate Valve?

An API 600 gate valve is a bolted bonnet cast steel gate valve designed per API Specification 600 for on-off service in petroleum, natural gas, petrochemical, and power plant piping systems. It provides tight shut-off with minimal pressure drop and is available in sizes 2″–48″ (DN50–DN1200), pressure classes 150–2500, and temperatures from -29°C to 593°C.

Key Specifications at a Glance

What Is an API 600 Gate Valve?

An API 600 gate valve is a bolted bonnet gate valve manufactured in accordance with the American Petroleum Institute (API) Specification 600. This standard covers the design, materials, manufacturing, testing, and documentation requirements for cast steel gate valves with flanged or butt-welding ends. API 600 gate valves are designed for on-off service in piping systems where minimal pressure drop and tight shut-off are required.

Types of API 600 Gate Valves

API 600 cast steel gate valves are available in several configurations to suit different service conditions:

1. Wedge Gate Valve

The wedge gate valve features a wedge-shaped disc that seats between two inclined seats. Available as solid wedge, flexible wedge, and split wedge designs. Solid wedge is suitable for general service, while flexible wedge compensates for thermal expansion and is ideal for high-temperature applications.

2. Slab Gate Valve

Slab gate valves use a flat disc (slab) that slides between parallel seats. They are commonly used in oil and gas pipeline applications where a full bore design is required for pigging operations. Slab gate valves offer excellent sealing performance and are available with through-conduit design.

3. Parallel Gate Valve

Parallel gate valves use two parallel discs with a spring or spreader mechanism to achieve sealing. They are suitable for low-pressure applications and provide reliable bidirectional sealing.

API 600 gate valves are available in a wide range of materials including carbon steel (WCB), stainless steel (CF8, CF8M), and chrome alloy grades to suit different service conditions. Contact Vornet Valve for a complete material availability list and material selection recommendation for your application.

API 600 vs API 6D: What’s the Difference?

While both API 600 and API 6D cover gate valves, there are important differences:

• API 600: Applies specifically to cast steel bolted bonnet gate valves for petroleum and gas industries. More stringent wall thickness requirements.
• API 6D: Applies to pipeline valves including gate, ball, and check valves. Covers both cast and forged steel.
• API 600 generally requires thicker walls and more robust construction than API 6D for the same pressure class.
• API 600 includes more detailed requirements for bonnet design, stem connections, and seat materials.

How to Select the Right API 600 Gate Valve

When selecting an API 600 gate valve for your application, consider the following factors:

1. Service Conditions: Determine operating pressure, temperature, and media characteristics
2. Material Selection: Choose body and trim materials compatible with the service fluid
3. Pressure Class: Select the appropriate Class (150, 300, 600, etc.) based on design pressure
4. End Connections: Flanged for easy installation, butt-weld for permanent connections
5. Actuation: Manual handwheel, gear operator, or automated (electric, pneumatic)
6. Bonnet Design: Bolted bonnet for standard service, pressure seal bonnet for high pressure

Frequently Asked Questions

What is the difference between API 600 and API 602 gate valves?

API 600 covers cast steel gate valves in sizes 2″ to 48″ with bolted bonnet design, while API 602 covers forged steel gate valves in smaller sizes (NPS 1/4″ to 4″) with threaded or welded bonnet. API 600 valves are heavier-duty and used in larger pipeline applications.

What pressure classes are available in API 600 gate valves?

API 600 gate valves are available in Class 150, 300, 600, 900, 1500, and 2500. The higher the class, the higher the pressure-temperature rating.

Can API 600 gate valves be used for throttling?

No. API 600 gate valves are designed for on-off (isolation) service only. Using them for throttling causes damage to the disc and seats due to vibration and erosion. For throttling applications, use a globe valve or control valve instead.

What testing is required for API 600 gate valves?

Per API 598, each API 600 gate valve must undergo hydrostatic shell test (1.5 × rated pressure), hydrostatic seat test (1.1 × rated pressure), and optional pneumatic test. Vornet Valve performs 100% testing on all gate valves before shipment.

How do I choose between wedge gate valve and slab gate valve?

Choose a wedge gate valve for general industrial applications including oil and gas, petrochemical, and power plants. Choose a slab gate valve when pipeline pigging is required (full bore design) or for high-pressure gas transmission lines where through-conduit flow is needed.

Why Choose Vornet Valve for API 600 Gate Valves?

Vornet Valve is a professional manufacturer of API 600 gate valves, with extensive experience in supplying cast steel gate valves to oil and gas, petrochemical, and power generation industries worldwide. Our API 600 gate valves are:

• Manufactured in accordance with API 600, ASME B16.34, and ISO 9001
• 100% hydrostatically tested per API 598
• Available with full material traceability
• Customizable with various trim materials and actuation options
• Backed by professional engineering support and rapid delivery

Contact Vornet Valve today for a quotation on API 600 gate valves for your project. Our technical team can assist with material selection, valve sizing, and application engineering.

Browse our complete selection of API 600 gate valves and other industrial gate valve types with various pressure classes and trim options.