Valve Grinding Services
Specialized precision grinding for valve manufacturers, repair facilities, and end-users.
Valve Grinding
As the sister company to United Valve, valve component grinding is our specialty. We understand valve design, function, and performance requirements better than general-purpose grinding shops. Our vertical grinder fleet (six machines from 36″ to 72″ diameter) was specifically selected to serve the valve industry.
Gate Valves
Gate valves are our specialty. We grind gate valve discs and bodies from 2″ through 72″ diameter.
Gate Valve Sizes
- Small: 2″ to 6″ — 36″ vertical grinder
- Medium: 8″ to 16″ — 36″ or 48″ vertical grinder
- Large: 18″ to 36″ — 48″ vertical grinder
- Extra Large: 40″ to 72″ — 72″ vertical grinder
Pressure Classes: 150# through 2500#, API 6A wellhead valves, special high-pressure designs.
Grinding Operations
- Body Bore Grinding: Precise diameter for gate and guide fit (±0.001″ to ±0.002″), cylindricity ±0.0005″
- Seat Ring Pockets: Precision diameter, flatness, depth, perpendicularity to body bore
- Special Flange Faces: Flatness ±0.0005″ to ±0.001″, gasket surface finish (125–250 Ra for spiral wound gaskets)
- Gate Grinding: Face grinding for sealing surfaces, flatness, proper thickness for wedge function
- Backseat Grinding: Stem backseat and mating bonnet surface grinding
Butterfly Valves
Butterfly valves require precision grinding of disc faces and body bores for proper sealing. Sizes: 6″ to 72″ diameter including wafer, lug, and flanged styles; high-performance and triple-offset designs.
Globe Valves
Globe valves require tight tolerances for proper plug/disc operation and sealing. Operations include seat ring grinding, cage bore grinding, guide bore grinding, and disc/plug grinding.
Check Valves
Check valves rely on precision ground seating surfaces for reliable flow prevention. Operations include disc face grinding, seat grinding, and body bore grinding.
Materials We Grind
Carbon Steel
- ASTM A105 (forged carbon steel — most common)
- ASTM A350 LF2 (low-temperature service)
- ASTM A216 WCB (cast carbon steel)
- ASTM A352 LCC/LCB (low-temperature cast)
Stainless Steel
- 316/316L (corrosion resistance, common)
- CF8M (cast 316 equivalent)
- 410 (lower corrosion resistance, higher strength)
- 17-4 PH (precipitation hardening, high strength)
Duplex and Super Duplex
- 2205 (duplex stainless)
- 2507 (super duplex)
Exotic Alloys
- Inconel, Monel, Hastelloy, Titanium
Platings & Spray Coatings
- Hard Chrome Platings
- Chrome Platings
- Nickel Platings
- Tungsten Carbides
- Aluminum Oxide
- Colmony
- Inconel (overlay/cladding)
- Monels
- Weld Claddings
Valve Grinding FAQs
What's the largest valve body you can grind?
Our 72-inch vertical grinder handles valve bodies up to 72″ diameter, 60″ height, and 40,000 lbs.
Can you grind damaged valve bodies for repair?
Yes, valve body repair grinding is a core service. We remove scoring, corrosion, and damage to restore valves to service. If required, weld repairs can be performed by one of our code-certified welders, in accordance with ASME Section IX. In-house NDE, including X-ray radiography, is available as well.
Do you grind valves to API specifications?
Yes, we grind valve components to meet API 598, API 6D, API 6A, and other industry standards.
How long does valve body grinding take?
Timeline depends on valve size and complexity. Typical gate valve body grinding: 1-3 days for standard sizes, 3-5 days for large valves (48″+).
Can you grind valve bodies in exotic materials like Monel or Hastelloy?
Yes, we grind all common valve materials including carbon steel, stainless steel, duplex, and exotic alloys.