5 Things to Know Before Buying bellow seal globe valve

Globe Valve Buyer's Guide (2021 Update)

Globe valve control the flow by the linear motion of disk, they are used in many industries, and it’s vital to learn about the valve before using it.

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There are several basic components of a Globe valve.

1. Bonnet

Bonnet provides a leakproof closure for the globe valve body. Globe valve can have two types of bonnets. Screw-in Bonnet; is a simple type of bonnet bolted to the body with high bolting torque. It provides a durable and pressure-tight seal. The other one is Union Bonnet; it is suitable for places where frequent cleaning and inspecting is done.

2. Cage

The part that surrounds the plug is called the cage. It is present inside the valve’s body and significantly influences the flow through the valve. As the plug or disk is moved, more part of the cage is exposed, and the flow will increase.

3. Stem

The stem is the component that joins the handwheel to the disk/plug. It transfers the force from the handwheel to the disc, which consequently controls the flow. Stem is a smooth rod with threaded ends to move up and down with the rotation of the handwheel.

4. Disk/Plug

The disk is the part that sits on the seat and stops the flow. Disk is attached to the stem and moves with the rotation of the handwheel. There are two types of plugs. Unbalanced plugs are solid and typically used in small globe valves with low-pressure drop. While the balanced plug has holes, it is easy to shut this plug because we don’t have to fight with static force.

5. Seat

The last part is the seat; it provides a stable surface for the disk to shut off. It is either screwed or integrated into the body.

The working of the globe valve is straightforward. When the handwheel is rotated in a clockwise direction, the stem will move downward, pushing the disk towards the seat. Lesser the difference between the seat and plug, the lesser will be the flow and vice versa. In the end, the disk will sit tightly over the seat ring, completely shutting off the fluid flow.

Similarly, the anti-clockwise movement will pull the disk away from the seat, which will open the valve allowing the fluid to flow freely.

5 Things to Know Before Buying Bellow Seal Globe Valve

Before purchasing a bellow seal globe valve, here are some critical considerations you should keep in mind to ensure you make an informed decision:

1. Understand Your Application

Bellow seal globe valves are particularly designed for applications where leak-tightness is crucial. Ensure you understand your operational requirements, including temperature, pressure, and the types of fluids or gases involved. This will help you choose the most appropriate valve that can handle your specific conditions.

2. Material Compatibility

The material of the valve is essential for its durability and function. Bellow seal globe valves are available in various materials such as stainless steel, carbon steel, and alloy steel. Select the material that is compatible with the fluid or gas you are working with to prevent corrosion and ensure a longer lifespan.

3. Maintenance Requirements

One of the benefits of bellow seal globe valves is their low maintenance due to the elimination of gland packing. However, periodic inspections and preventive maintenance are still essential. Check the maintenance guidelines and ensure you have the resources and skills to keep the valve in good working condition.

4. Manufacturer Reputation

Choosing a reputable manufacturer is crucial to ensure you are getting a high-quality product. Look for manufacturers who have certifications and a proven track record of delivering reliable products. They should also provide after-sales support and service for any future needs.

5. Compliance and Standards

Ensure that the bellow seal globe valve complies with industry standards and regulations. This is particularly important for industries like pharmaceuticals, chemicals, and oil & gas where safety and reliability are paramount. Compliance ensures that the valve meets the necessary safety and performance benchmarks.

For reliable valves and more information, visit ANSI Bellows Seal Gate Valve.

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