Premium Boiler Valve Spares & Die-Formed Packing Rings

John Moncrieff Ltd is a recognised industry leader in the supply of high-quality boiler valve spares and die-formed packing rings—critical components that ensure safe, efficient and reliable boiler valve operation across demanding thermal and pressure environments.

Our die-formed packing rings are precision engineered to deliver a secure, leak-tight seal around valve spindles. Manufactured from high-purity graphite, these rings provide exceptional durability, thermal stability, and chemical resistance—making them the trusted choice for high-temperature and high-pressure boiler systems.

Why Choose Die-Formed Packing Rings?

• Excellent sealing integrity around valve spindles
• High thermal resistance for extreme boiler conditions
• Chemically inert and compatible with aggressive media
• Easy installation and removal during routine maintenance
• Built for long service life—reducing downtime and costs

Suitable for a Wide Range of Boiler Valves

• Globe Valves – precise flow regulation
• Gate Valves – full open/close isolation
• Check Valves – prevention of backflow

Compatible Boiler Media

• Hot water systems
• High-temperature and high-pressure steam
• Heat-transfer fluids
• Hydrogen gas
• Ammonia
• Organic solvents
• Hydrocarbons
• Cryogenic liquids

Custom-Manufactured Packing Rings

If your application requires a non-standard size or specialised configuration, we offer a full custom manufacturing service. Provide the required dimensions and specifications, and our engineering team will produce a tailored solution to match your exact operating conditions.

Choose John Moncrieff Ltd for precision-engineered boiler valve spares and die-formed packing rings—delivering outstanding sealing performance, long-term reliability, and industry-proven quality.