Introduction

This article contains all the information you need to know about ANSI Cast Steel Globe Valve

Read further and learn more about:

Specification

Actuator

Types

Application

Chapter 1 - Specification

Here's a typical specification for an ANSI (American National Standards Institute) cast steel globe valve:

Body Material

Cast steel ASTM A216 WCB (carbon steel), ASTM A217 WC6 (chromium molybdenum steel), ASTM A217 WC9 (chromium molybdenum steel), or other suitable materials for corrosion resistance and strength.

Trim Material:

The trim materials are typically selected based on the fluid characteristics and service conditions. Common trim materials include stainless steel (ASTM A182 F316, ASTM A182 F304), carbon steel (ASTM A216 WCB), or other suitable alloys for erosion and corrosion resistance.

Seat Material:

The seat material is often made of stellite, stainless steel, or other hardened materials for excellent wear resistance and sealing performance.

Valve Size

Typically available in sizes ranging from 2" to 24" (larger sizes may be available on request).

Pressure Rating

ANSI Class 150, 300, 600, 900, 1500, or 2500, depending on the application requirements and operating conditions.

Temperature Range

Suitable for operating temperatures ranging from -29°C to 593°C (-20°F to 1100°F) or higher, depending on material selection and pressure rating.

End Connections

Flanged ends, conforming to ASME B16.5 standards, with raised face (RF), flat face (FF), or ring joint face (RTJ) options available. Socket weld or butt weld ends may also be available upon request.

Design Standards:

The valve design should comply with international standards such as API 600, API 602, ASME B16.34, or equivalent for construction, design, and testing requirements.

Chapter 2 - ANSI Cast Steel Globe Valve Actuator

Forged steel globe valves can be equipped with various types of actuators to automate their operation. The choice of actuator depends on factors such as the valve size, pressure rating, application requirements, and control system preferences. Here are some common types of actuators used with forged steel globe valves:

Manual Actuator:

Some actuators, especially electric and pneumatic ones, may come with a manual override feature. This allows manual operation of the valve in case of power or air supply failure.

Electric Actuators: 

These actuators use an electric motor to drive the valve stem, opening or closing the valve upon receiving electrical signals. Electric actuators are suitable for applications where precise control and automation are required. They can be further classified into:

Rotary Electric Actuators: Convert rotary motion into linear motion to operate the valve stem.

Linear Electric Actuators: Directly convert electrical energy into linear motion to drive the valve stem.

Hydraulic Actuators: 

Hydraulic actuators utilize hydraulic pressure to operate the valve. They are suitable for applications requiring high force output and precise control.

Pneumatic Actuator:

Pneumatic actuators use compressed air to operate the valve. They are commonly used in applications where electricity is not readily available or in hazardous environments where sparks need to be avoided.

Chapter 3 - ANSI Cast Steel Globe Valve Types

While there aren't distinct "types" of ANSI cast steel globe valves in the same way as there are for other valve configurations like gate valves or ball valves, there are variations and features that differentiate them based on specific requirements and applications. Here are some common variations you might encounter:

Bolted Bonnet Globe Valve:

This is the most common type, featuring a bonnet bolted to the valve body, allowing for maintenance and repair.

Pressure Seal Globe Valve:

These valves are designed for high-pressure applications and feature a bonnet that is pressure-sealed to the valve body, eliminating the need for external bolting.

Cryogenic Globe Valve:

These are designed to handle extremely low temperatures and are used in applications such as liquefied natural gas (LNG) handling or cryogenic storage facilities.

Forged Steel Globe Valve:

Though not strictly a different "type," some globe valves are forged rather than cast. Forged steel globe valves offer high strength and reliability and are suitable for high-pressure and high-temperature applications.

Extended Bonnet Globe Valve:

These have a bonnet that extends above the valve body, providing thermal insulation and protection for the valve stem. They are used in applications where the fluid temperature exceeds the temperature rating of standard valves.

Chapter 4 - ANSI Cast Steel Globe Valve Application

ANSI cast steel globe valves find application in a wide range of industries and processes where reliable flow control, durability, and robust construction are essential. Here are some common applications:

Power Generation:

Globe valves are used in power plants for controlling the flow of steam, water, and other fluids in boiler feedwater systems, steam turbine bypass systems, cooling water systems, and other auxiliary systems.

Oil and Gas Industry:

Globe valves are employed in upstream, midstream, and downstream operations within the oil and gas industry. They are used for flow control in pipelines, wellheads, manifold systems, production facilities, and refineries.

Petrochemical and Chemical Processing:

Globe valves are utilized in petrochemical and chemical processing plants for handling various fluids such as acids, alkalis, solvents, and hydrocarbons. They are commonly found in reactors, distillation columns, fractionation units, and storage tanks.

Water and Wastewater Treatment:

Globe valves play a crucial role in water and wastewater treatment plants for controlling the flow of water, chemicals, and sludge. They are used in processes such as filtration, sedimentation, disinfection, and chemical dosing.

Marine and Shipbuilding:

Globe valves are utilized in marine and shipbuilding applications for controlling the flow of seawater, fuel, lubricants, and other fluids aboard ships and offshore platforms.

Food and Beverage Industry:

Globe valves are employed in food and beverage processing plants for controlling the flow of ingredients, steam, and cleaning solutions. They are designed to meet sanitary standards and are used in applications such as brewing, dairy processing, and food packaging.

Mining and Mineral Processing:

Globe valves are utilized in mining and mineral processing operations for controlling the flow of slurries, chemicals, and process water in extraction, beneficiation, and dewatering processes.

Fire Protection Systems:

Globe valves are incorporated into fire protection systems such as fire sprinkler systems and fire hydrants to control the flow of water or fire suppression agents in the event of a fire.

HVAC Systems: 

Globe valves are used in heating, ventilation, and air conditioning (HVAC) systems for controlling the flow of hot water, chilled water, and refrigerants. They regulate the flow of fluids to maintain desired temperatures in buildings, industrial facilities, and commercial spaces.