Skip to content
Globe Isolation Valves
Valveforce offer a cost effective and complete range of isolating stop valves, which are suitable for most applications, such as steam, air, thermal oil and other neutral non aggressive media up to 350°C.
Experts in Design, Supply, Repair & Installation
Speak with our experts
Fill out our quick and easy contact form with your enquiry and we'll get back to you.
Globe Isolation Valves Explained
Purpose
A Globe Isolation Valve is a manually operated device designed to start or stop the flow of liquid in a pipeline. These valves play a crucial role in safely isolating circuits and process loops, enabling efficient system operation, safer inspections, and streamlined maintenance. By preventing unwanted flow, isolation valves enhance process reliability and overall efficiency.
Globe Isolation Services
Specification & Design
Gland Packed Isolation Valves
- Graphite packed for a cost effective stop valve solution
- Full range of sizes and body materials for isolating valves available
- Stainless steel internals for a robust service and reliable shut off
Bellows Sealed Isolation Valves
- Bellows sealed for environmentally friendly zero leakage
- Energy saving stem seal so losses are eliminated
- Safer to work around these isolating valves as no dangerous leaks
Installation & Commissioning
Selection of Valve Type and Size
Valveforce assists in selecting the correct type and size of the valve based on application requirements, process pressure, temperature, and flow needs. Proper sizing ensures safe conditions and operational efficiency, whilst reducing wear.
Material Compatibility
We ensure that the materials of the valve are compatible with steam and any chemicals in your system, preventing corrosion and degradation. Valveforce's expert material selection guarantees longevity and reliability.
Orientation and Positioning
Valveforce installs valves in the correct orientation and position, ensuring ease of access for operation, maintenance, and inspection. Our strategic placement enhances functionality and serviceability. The correct location of isolation valves ensures your process equipment can be safely isolated and maintained. We can check and amend your system to ensure they are in the correct position.
Pressure and Temperature Ratings
Valveforce verifies that the pressure and temperature ratings of the valves meet or exceed the maximum operating conditions of your system, ensuring safety and durability under all conditions.
Overhaul & Repair
Bellows Failure
Valveforce’s repair services include meticulous inspection and replacement of failed bellows, using high-quality materials resistant to fatigue, corrosion, and excessive pressure, ensuring the integrity and efficiency of your steam system.
Packing Wear and Tear
Our services include regular inspections and timely replacement or adjustment of gland packing materials, minimising steam leaks and maintaining operational integrity.
Seal Degradation
Our team expertly addresses secondary sealing issues, replacing or repairing degraded gland packings to prevent leaks and maintain system performance.
Packing Over-Tightening
Through expert adjustment and training, Valveforce prevents over-tightening, preserving both stem and packing material and ensuring smooth valve operation.
Stem Corrosion
We can advise if the stem needs replacing and install a new one if required.
Scaling and Fouling
Valveforce’s cleaning and maintenance services address scaling and fouling issues, ensuring valves close properly and are free from erosion.
Maintenance & Service
Preparation
System Shutdown: Safely shut down the system and isolate the bellow sealed valve from the process line. Ensure that the system is depressurized and cooled down if dealing with high-temperature fluids.
Lockout/Tagout (LOTO): Implement LOTO procedures to ensure the valve cannot be accidentally operated during maintenance.
Drainage: Drain any remaining fluids from the valve and connected piping to avoid spillage during maintenance.
Actuators: Ensure any electrical and pneumatic isolations are made for the actuators.
External Inspection
Visual Inspection: Inspect the external parts of the valve, including the body, bonnet, and actuator (if applicable). Look for signs of corrosion, leaks, physical damage, or any unusual wear.
Bellows Integrity Check: Examine the external portion of the bellows for any signs of deformation, corrosion, or damage. Since the bellows are critical for sealing, any defects here are significant.
Stem Inspection: Check the valve stem for signs of corrosion, wear, or misalignment. Ensure that the stem moves freely without resistance.
Disassembly
Valve Disassembly: Carefully disassemble the valve according to the manufacturer’s guidelines. This usually involves removing the bonnet, actuator, and other internal components.
Bellows Removal: Extract the bellows assembly for closer inspection. Handle the bellows carefully, as they are delicate and can be easily damaged.
Seat and Disc Removal: Remove the valve seat and disc (or plug) to inspect these components. Look for signs of wear, erosion, or pitting.
Internal Inspection
Bellows Inspection: Inspect the bellows for any signs of fatigue, cracks, or pinhole leaks. Even small defects can lead to failure, so this component should be inspected with particular care.
Seat and Disc Inspection: Examine the seating surfaces for wear, scoring, or pitting. These surfaces need to be smooth and undamaged to ensure a proper seal.
Stem and Packing Inspection: Inspect the stem for straightness and wear. Check the packing (if applicable) for wear and replace if necessary.
Cleaning
Component Cleaning: Clean all valve components, including the body, seat, disc, stem, and bellows. Use appropriate cleaning agents that are compatible with the materials and remove any debris, corrosion, or scale.
Seat and Disc Cleaning: Pay special attention to the seat and disc surfaces, as any contaminants here can affect the valve's sealing ability.
Component Replacement
Bellows Replacement: If the bellows show any signs of wear or damage, they should be replaced with a new unit. The bellows are critical to the valve’s operation, and any defect can lead to failure.
Seal and Packing Replacement: Replace all gaskets, seals, and packing as part of the overhaul process. These components are usually inexpensive but crucial for ensuring a leak-free operation.
Seat and Disc Replacement: If the seat or disc is significantly worn or damaged, consider replacing these components to restore the valve’s sealing capability.
Reassembly
Component Reassembly: Reassemble the valve carefully, following the manufacturer's specifications. Ensure that all components, especially the bellows and seat, are correctly positioned and secured.
Torque Specifications: Apply the correct torque to all fasteners to avoid over-tightening, which can damage components, or under-tightening, which can lead to leaks.
Testing and Calibration
Leak Testing: After reassembly, conduct a leak test on the valve. This usually involves pressurizing the valve to its rated pressure and checking for leaks around the stem, bellows, and seating surfaces.
Functional Testing: Test the valve’s operation by cycling it through its full range. Ensure that it opens and closes smoothly without any binding or excessive resistance.
Pressure Testing: If applicable, perform a pressure test to verify that the valve can maintain its rated pressure without leakage.
Component Testing: Check actuators, feedback switches and any output signals work as required.
Final Inspection and Documentation
Final Visual Inspection: Conduct a final inspection of the valve to ensure that it is correctly assembled and that all components are in good condition.
Documentation: Record all maintenance and overhaul activities, including any parts replaced, test results, and any adjustments made to the valve. Keep this documentation for future reference and regulatory compliance.
Reinstallation
Valve Reinstallation: Reinstall the valve in the system, ensuring that all connections are properly sealed and that the valve is correctly oriented.
System Repressurisation: Gradually bring the system back to operating pressure, monitoring the valve for any signs of leaks or abnormal operation.
Post-Service Support
Operator Training: Provide training to operators on the correct operation and maintenance of the bellow sealed valve. Ensure they understand how to monitor the valve for signs of wear and how to perform routine checks.
Scheduled Follow-Up: Arrange for a follow-up inspection after a specified period to verify that the valve continues to operate correctly after the overhaul.
Regular Maintenance Plan
Routine Inspections: Establish a regular inspection and maintenance schedule for the bellow sealed valve, including periodic leak testing and visual inspections.
Preventive Maintenance: Implement preventive maintenance strategies to address potential issues before they lead to valve failure. This includes monitoring the bellows for early signs of fatigue and replacing them as needed.
Learn more about Valveforce Service Agreement
For more information,
Access our free brochure
For more information,
Watch our short film
