Water Treatment
Large cooling-water, fire-main, and transmission gate valves.
Gate Valve · Multi-turn
Gate valves give straight-through isolation with low pressure drop on water, steam, and hydrocarbon lines, but their rising stems translate the gate over many handwheel turns — multiplying input torque and adding axial thrust on the gear train. Multi-turn worm gear operators with thrust bearings, ISO 5210 base mounts, and optional bevel-gear remote drives address these duties.
Application Foundation
A gate valve gear operator is a multi-turn unit that moves a rising or non-rising stem through the gate's full travel over many revolutions. Unlike quarter-turn valves, gate valves load the operator with axial stem thrust as well as torque, so the gear train needs thrust bearings sized to the stem load and a self-locking worm to hold the gate against line pressure.
Size the operator from the gate-valve stem torque and thrust at design pressure, including stem diameter, pitch, and turns to open, then match the ISO 5210 base. Large cooling-water, fire-main, and refinery gate valves can exceed 10,000 N·m effective torque; multi-turn and two-stage units with reinforced housings and optional bevel-gear remote drives cover these duties.
Engineering Data
| ISO 5211 Flange | Typical Valve Size Band* | Common Valve Families | Matson Models Offering This Flange |
|---|---|---|---|
| F05 | Small bore | Ball, plug, small butterfly | M07 |
| F07 | Small–medium bore | Butterfly (wafer), ball, plug | M07, M10 |
| F10 | Medium bore | Butterfly, ball, plug | M07, M10, M12 |
| F12 | Medium bore | Butterfly (lug), ball, gate top-work | M12, M14 |
| F14 | Medium–large bore | Butterfly, trunnion ball, gate | M12, M14, M14A, M15 |
| F16 | Large bore | Butterfly (double flange / AWWA), ball, gate | M14, M14A, M15, M16 |
| F25 | Heavy / large bore | Large AWWA butterfly, high-pressure ball, large gate | M16 |
*Valve size band is indicative only — actual flange depends on the valve manufacturer's top-work, stem, and torque rating. Flange options and Matson single-stage model data are from the Matson worm gearbox catalog (M07–M16, 200–4,400 N·m). Two-stage and electric-actuator series extend up to 160,000 N·m. Confirm the exact flange against your valve datasheet.
| Variant | Actuation | Typical Torque Driver | Mounting Interface |
|---|---|---|---|
| Rising-stem gate | Multi-turn | Stem torque + axial thrust | ISO 5210 base |
| Large-diameter gate | Multi-turn (geared) | High thrust; long travel | ISO 5210 base, bevel option |
General selection guidance by torque demand and top-flange interface. Match the required break-to-open torque (with safety factor) and the valve top-work flange to a Matson model; exact model and dimensions are confirmed against your valve datasheet — request a datasheet.
Per-model specifications (dimensions, weights, drive bushing details): available on request — request a datasheet. Send your valve tag, bore, pressure class, and required output torque and our engineers return a model recommendation with the matching ISO 5211 interface.
Operation
Gate valve worm gear operators convert many handwheel turns into rising-stem travel while carrying axial thrust on dedicated bearings. Self-locking worms hold the gate at any position, and ergonomic rim-pull handwheels keep operator effort within limits on large valves. Bevel-gear remote drives reach gate valves in pits and galleries, and actuator-ready bases let multi-turn electric actuators replace the handwheel. Stem dimensions, pitch, and turns-to-open are confirmed against the valve drawing before manufacture.
Engineering
By Industry
Large cooling-water, fire-main, and transmission gate valves.
Refinery and terminal transfer-line isolation.
Feedwater, condensate, and circulating-water isolation.
Penstock and bypass gate valves at large diameter.
Manufacturing Partner
Operators sized against real valve torque charts and top-work drawings — not generic catalog tables.
Standard and adapter mounting for current and legacy valve patterns without field rework.
Private label, locked BOM, and volume pricing for valve OEM and distributor programs.
STEP models, center-height tables, and export certificates issued with the commercial quote.
Common Questions
A valve gearbox uses gearing to multiply handwheel torque and hold valve position. On a gate valve a multi-turn worm gear operator converts many handwheel revolutions into rising-stem travel while thrust bearings carry the axial stem load. The self-locking worm keeps the gate from creeping under line pressure.
A gate valve operates by raising or lowering a gate (wedge or disc) across the bore to open or close flow. The stem rises over many turns of the handwheel or operator, giving full-port flow and low pressure drop when open. A multi-turn gear operator provides the torque and thrust handling for large valves.
API 600 is the standard for bolted-bonnet steel gate valves used in petroleum and gas industries. It defines design, materials, dimensions, and testing for cast steel gate valves. Operators for API 600 gate valves are sized to the stem torque and thrust the standard's valves develop at rated pressure.
A gear-operated valve uses a gearbox between the handwheel and stem to multiply torque and hold position. On gate valves a multi-turn worm gear operator handles the high torque and axial thrust of rising-stem travel and provides a base for multi-turn electric actuators.
Match a multi-turn operator to the gate valve's stem torque and axial thrust at design pressure, plus stem diameter, pitch, and turns to open, on an ISO 5210 base. Large valves may exceed 10,000 N·m effective torque and need two-stage units. Send the valve drawing for sizing.
Send your gate valve stem diameter, pitch, turns to open, and design pressure. We size a multi-turn worm gear operator with thrust-rated bearings and the correct ISO 5210 base.