Stationary Valve Grinding Machine
Not every valve repair happens in-line. When a valve is removed for major overhaul, sent in for scheduled maintenance, or when the seat diameter and grinding depth exceed what a hand-held portable tool can reliably hold flat, the job moves to the workshop. A stationary valve grinding machine gives that workshop the rigidity, work-holding, and repeatable accuracy that a bench-mounted setup provides but a portable field tool cannot — precision restoration of valve seats and valve discs from DN100 up to DN800.
Available Models
| Model | Grinding Range | Grinding Disc | Motor Power | Weight |
|---|
| MT-600 | DN100–600 (4″–24″) | Adjustable spindle, small-disc kit for below DN100 | 2,200 W (+550 W lift motor) | — |
| MT-800X | DN100–500 (4″–20″) | Φ800 mm | 2,200 W | 350 kg |
| MT-1200X | DN300–800 (12″–32″) | Φ1200 mm | 2,200 W | 1,000 kg |
Mid-size plant valves run comfortably on the MT-600 or MT-800X; large valve seats and discs on power boilers, pressure vessels, and heavy process lines move up to the MT-1200X. All three run on 380V/50Hz industrial supply with variable-speed spindle control for coarse removal and fine finishing passes on the same seat.
What a bench-type valve grinding machine actually gives you
Rigid stationary frame — unlike a hand-held portable unit, the machine itself doesn't move during grinding, which is what keeps a large seat flat and square across its full diameter
Adjustable-tilt worktable — the MT-600's worktable tilts 0–12°, letting the operator angle the valve body to match the seat geometry instead of forcing the valve into a fixed position
V-block clamping down to small diameters — clamping range from roughly Φ45mm to Φ500mm on the worktable covers small valve cores through mid-size valve bodies on the same fixture
Stepless spindle speed control (0–1400 r/min) — coarse grinding and fine lapping passes on the same seat without swapping equipment
Optional eccentric spindle — for seat geometries that need an offset grinding path rather than a straight concentric pass
Double-station capability on select models — two operators or two valves can be processed in parallel, which is where a bench-type valve grinding machine earns its keep in a shop running scheduled overhaul volume rather than one-off field repairs
Why workshops specify a bench-type machine over a portable tool
The choice between portable and stationary equipment isn't really about preference — it's about where the repair happens and how large the valve is. Procurement teams typically move to a stationary valve grinding machine, sometimes requested, when:
The valve has already been pulled from the line for scheduled overhaul, so on-site repair speed is no longer the priority — repeatable precision is
Seat diameters exceed what a hand-guided portable disc can hold flat and square across the full surface
Multiple valves need to be processed through the shop on a schedule, where a fixed work-holding setup and consistent spindle speed matter more than portability
The valve body itself needs to be clamped, tilted, and centered precisely — something a bench structure with a V-block worktable does far more reliably than a hand-mounted rig
If your repair is happening on the pipeline without removing the valve, our Portable Globe & Safety Valve Grinding Machine and Portable Gate Valve Grinding Machine are built for that job instead — see the comparison note at the end of this page.
Model Selection Guide
Nominal valve size is a starting point, not the deciding factor — actual seat diameter, valve height, and flange diameter all determine which stationary valve grinding machine bench a given valve will fit. To confirm the right model, we need:
Valve type and nominal size
Actual seat or disc diameter to be ground
Overall valve height and maximum flange diameter
Required grinding depth
Valve drawing or clear photo
Whether the repair target is the valve seat, the valve disc, or both
Our team reviews this against each machine's maximum allowable valve height, flange diameter, and grinding depth before recommending a model — so the valve is confirmed to fit the worktable before you order, not after it arrives at your shop.
Application Scenarios
Scheduled overhaul of pulled valves.
When valves come off the line for planned maintenance rather than emergency repair, workshops standardize on a stationary valve grinding machine because repeatable seat flatness across a batch of valves matters more than on-site speed.
Mixed valve types through one repair shop.
Gate valve wedges, globe valve seats, and safety valve discs often pass through the same workshop on different days. A bench-type valve grinding machine with adjustable worktable tilt and a range of clamping fixtures handles all three without swapping equipment.
High-volume maintenance centers.
Repair centers processing multiple valves per week benefit from double-station models, where two valves are ground in parallel rather than queued through a single portable unit.
Industries Served
Power generation, petroleum and petrochemical processing, chemical processing, metallurgy, papermaking, shipbuilding, and other industrial valve maintenance workshops handling scheduled valve overhaul.
Frequently Asked Questions
Q:What's the difference between a stationary and a portable valve grinding machine?
A:A stationary valve grinding machine is a bench-mounted unit for workshop repair after the valve is removed from the pipeline — it offers more rigidity and work-holding for large or batch repairs. A portable machine works in-line without removing the valve, prioritizing speed and field access over raw grinding capacity.
Q:Can one machine grind both the valve seat and the valve disc?
A:Yes — all three models are rated for both valve seats and valve discs; the fixture and grinding head are changed rather than the machine itself.
Q:What valve sizes fit on the worktable?
A:Clamping range spans from small valve cores (roughly Φ45mm) up to large valve bodies, model-dependent — see the Model Selection Guide above to confirm fit against your valve's actual flange diameter and height.
Q:Is double-station processing available?
A:Yes, on select models — two valves can be set up and ground in parallel, which shortens turnaround for shops running scheduled batch maintenance.
Looking for on-site repair instead of workshop grinding?
If your repair needs to happen in-line without pulling the valve, see our Portable Globe & Safety Valve Grinding Machine for flat and conical seats, or the Portable Gate Valve Grinding Machine for gate valve wedges. Once a valve is back together, it still needs to be pressure-verified — see our Valve Pressure Test Bench range, including the dedicated Safety Valve Test Bench.
Send your valve drawing, seat dimensions, and repair volume to sales@metalskingdom.com. Our team will confirm the right stationary valve grinding machine model and worktable configuration before you commit to an order.
