What is an Angle Seat Valve?

The advantages of pneumatic angle seat valve

Angle seat pneumatic valves are highly regarded for their efficient transmission of fluid media and reliable performance in a variety of fluid control applications. Let's discuss their other advantages:

◆ High Flow Rate

◆ Durability

◆ Space-Saving Design

◆ Smooth Operation

◆ Low Maintenance Cost

How does an pneumatic angle seat valve work?

We all know that mostly valve with the cooperation of control system or actuator has normally open and normally closed are two common working states of valves. In both Normally Open (NO) and Normally Closed (NC) angle seat valves, the spring inside the actuator is the primary component that controls the piston, which in turn drives the valve plug to maintain either the open or closed state.If compressed air is introduced, its force acts against the spring force. If the thrust generated by the air pressure exceeds the force of the spring, it overcomes it, moving the piston and consequently changing the state of the valve.

Before we know the pneumatic angle seat valve how to work,we need understand the structural composition of the pneumatic angle seat valve firstly.

Components of  pneumatic angle seat valve

Valve Body: The main body of the angle seat piston valve is generally made of stainless steel, brass, or other high-pressure and corrosion-resistant materials, providing support for the internal working components.

Actuator: The pneumatic actuator component mainly drives the stem and the plug of the angle seat valve to perform the opening and closing motion.Its structure includes components such as the cylinder, piston, piston rod, and spring.

Valve stem:This is structural components of valves which is located inside the valve body and mainly connects the piston rod with the valve plug, serving to transmit both tensile and compressive forces.

Valve core and seat:The valve core is a key component for controlling the flow of the medium, and the seat valve is the sealing surface when the valve core is closed. Under the combined action of the valve plug and valve seat, the flow diameter (bore size) of the angle seat valve is influenced and controlled.

The working principle of of angle seat valve

The operation of a pneumatic angle seat valve begins with a change from its normally open or normally closed state. This means that the angle seat valve first remains in an open or closed state under the action of its spring. Then, when the thrust of the supplied compressed air exceeds the spring force, it drives the piston to move, which in turn opens or closes the valve by actuating the valve plug. The following example illustrates this process using the normally closed state.

◆ In the initial state, the spring presses the valve core against the valve seat, and the diameter is closed

◆ When the pneumatic actuator starts to work, and the actuator's piston rod moves to drive the angle seat valve stem. The valve stem lifts the valve core

◆ After stopping the gas supply, the spring pulls the valve core to reset  and tightly attached to the valve seat, closing the fluid channel.

Pneumatic angle seat valve with Normally open state work in the opposite way.

Note that for an angle seat valve, a larger angle is not always better. If the turning angle is too large, vortices may form, causing energy loss of the medium. By adopting a 90° non-right-angle flow path design, the pneumatic angle seat valve ensures reliable sealing while significantly reducing flow resistance.

Common application industries 

Pneumatic angle seat valve is a ideal for applications where high flow, fast response, and reliable sealing are required.

◆ HVAC Systems

◆ Chemical Processing

◆ Food and Beverage

◆ Automated Machinery

◆ Water Treatment Plants

Pneumatic angle seat valve types

The common classification standards for angle seat valves include drive mode, material, function, connection type, and application conditions. In the following, we will focus on analyzing the types of pneumatic angle seat valves from the perspectives of characteristics, caliber, material, and brand.

◆ Standard Angle Seat Valve: Suitable for most industrial applications that require medium pressure and steam control.Like SMC,Festo,Airtac standards and so on.

◆ High-Pressure Angle Seat Valve: These are designed to handle high-pressure systems and are often used in oil & gas, and chemical industries.

◆Valve Orifice:The diameter of the air operated angle seat valve is different, for example, the PV100 series has a smaller diameter, while the PV500 series has a larger diameter.The larger the orifice, the more suitable it is for working conditions with higher flow rates.

◆ Stainless Steel Angle Seat Valve: Known for their corrosion resistance, these are ideal for environments where hygiene and durability are critical, such as the food and beverage industry.

◆ SMC Angle Seat Valve: SMC is widely used in pneumatic applications due to their high precision and reliability in controlling air flow.

Driven types and structure comparison

Pneumatic Actuation: With fast response and suitable for frequent operation industries but it requires an external air supply,Integration with a PLC and sensors is required to enable remote operation.

Electric Actuation: Actuating by electric actuator to control valve opening and closing, allowing remote operation but the opening and closing speed is slower than pneumatic actuator.

Manual Operation: The valve stem is operated by manually turning a handle or handwheel. This design is simple and low-cost, but it requires constant human involvement.

Suggestions when you choose pneumatic angle seat position valve

The performance and application of a angle seat valve largely depends on its valve body material and sealing material. When making a choice, it should be based on specific needs.

Material Compression

Stainless Steel: Corrosion-resistant, high-temperature tolerant, and high strength. Suitable for chemical processing, food and pharmaceutical industries, steam, and corrosive fluids.

Brass: Cost-effective and suitable for neutral media. Commonly used for compressed air, cooling water, and small-scale systems.

Plastic: Resistant to certain chemicals and lightweight. Ideal for low-temperature, low-pressure, and non-metallic environments.

Seal Material

PTFE: High temperature and corrosion resistance with low friction. Suitable for strong acids, alkalis, and high-temperature media.

NBR: Oil-resistant with good elasticity. Ideal for compressed air and hydraulic oil.

EPDM: Resistant to hot water and steam. Suitable for drinking water and low-concentration chemicals.

Fokca Introduction

Fokca is a professional pneumatic actuated angle seat valve manufacturer of startup equipment based in Ningbo, specializing in a wide range of pneumatic valves, including Angle Seat Valves, Globe Control Valves, Solenoid Valves, and other valve products. Additionally, we offer Pneumatic Hoses & Connectors, Hydraulic Components, and other types of products.As automation equipment suppliers, we are dedicated to supplying high-quality angle seat piston valves and other pneumatic components, meeting the valve needs of various industrial applications.