Ball Valves

LPA17 Segment Ball Valve

LPA17 Segment Ball Valve built around an eccentric, sector-shaped ball segment rather than a full sphere—its offset geometry and shearing edge make it the workhorse for fibrous, abrasive, and solids-laden slurries that destroy conventional trim.

Product Description

Unlike a full-bore ball valve, the segment ball valve employs a partial-sphere (sector) disc mounted off-center on the shaft. As the segment rotates into the seat, its cam action forces the ball edge against the seat ring with increasing interference, producing a tight shutoff without the high breakaway torque of concentric designs.

The wide-open segment profile provides a large, unobstructed flow passage with exceptionally high Cv capacity—often matching or exceeding that of a same-size butterfly valve—while the contoured notch geometry delivers near-equal-percentage throttling with rangeability up to 100:1. This combination of high-capacity flow and precise control in a single valve eliminates the need for separate isolation and control devices.

The leading edge of the segment acts as a guillotine, slicing through pulp fibers, stringy rags, and entrained solids on every stroke—preventing the buildup that plugs globe or butterfly valves.

Flow characteristic is near-equal-percentage with rangeability up to 100:1. Seat options: reinforced PTFE (≤ 200 °C), PEEK (≤ 260 °C), or metal-to-metal with Stellite overlay (≤ 425 °C). Body: WCB, CF8M, or duplex A182 F51. Sizes DN 25–DN 500, Class 150 / 300.

Key Features

Eccentric cam action – Offset shaft geometry multiplies seating force at the final degrees of closure while keeping running torque low.
Self-scouring shear edge – Segment tip cuts through fibers and soft solids each stroke; seat stays clean without external flushing.
High-capacity flow control – Wide-open segment profile delivers Cv values comparable to butterfly valves, enabling high-volume throughput in a compact envelope; one valve handles both isolation and modulating duty.
Metal or soft seat swap – Same envelope accepts elastomeric or hard-faced seats for temperature and abrasion upgrades.
Blowout-proof stem & anti-static continuity – Standard per API 6D / ISO 10497.
ISO 5211 top pad – Direct-coupled pneumatic, electric, or hydraulic quarter-turn actuator mounting.

Typical Applications

Pulp & paper: stock preparation, white water, broke systems
Mining: tailings, cyclone underflow, thickener feed
Sugar & starch mills: juice, massecuite, molasses lines
Municipal sludge and screened wastewater
Viscous chemical slurries (TiO₂, calcium carbonate, fly-ash)
Biomass and wood-chip transfer with entrained bark
Economical high-flow steam flow control

Specifications

Valve Size:
NPS1/2 - NPS12;
DN15 - DN300
Pressure Class:
ASME Class 150, Class 300, Class 600;
DIN PN10, PN16, PN25, PN40, PN63
Operating Temperature:
-46 to +232 °C / -50 to +450 °F
Process Connection Type:
Flanged, Wafer
Valve Bonnet:
Standard, Extensions
Stem Seal:
Adjustable Packing
Seat Leakage:
Class IV, V and VI (FCI-70.2) Standard Leakage Rates, soft seating Class VI-Bubble tight (Zero Leakage)
Flow Characteristics:
Equal Percentage
Critical Service:
Noise Abatement, Dirty Service, Steam Condition, Erosive, Corrosive, General Service
Valve Actuator:
Electric, Hydraulic, Pneumatic, Lever, Gear, Electro-Hydraulic
Valve Accessories:
Pneumatic Positioner, Electro Pneumatic Positioner, Limit Switch, SOV, Air lock relay, Volume Booster, AFR, Position Transmitter
Certifications:
PED, NACE, ATEX, Fire Safe, SIL capable, Fugitive Emission
Media:
Pulp, Liquids, Air, Water, Steam
Other Configurations:
Contact your local Lapar business partner or sales office to learn about additional specifications or options for this product.