PRODUCT
Lever Operated Lug Type Butterfly Valve (4 inch Lug Style)
Designed as Standard : GB/T12238-2008; AWWA C504
Face to Face : GB/T12221-2005-J1; API609(400/450 Excepted)
Flange as Standard : GB/T17241.6 ; DIN2632/2633;BS4504;
JIS-B2220 ; ASME B16.5(150LB)
Test as Standard : GB/T13927-2008; BS EN12266-1 12266-2
As an industrial valve manufacturer supplying flow control solutions worldwide, TWIV FLUID VALVE builds the lug type butterfly valve for dead-end service and bidirectional pressure applications. Each lug is drilled and tapped so the valve can be bolted to both pipe flanges independently – one side of the line can be dismantled for maintenance while the other side stays under pressure and fully sealed.
The heavy-duty lug style butterfly valve uses a ductile iron GGG40 body with a spherically machined seat, a polished stainless steel disc and a replaceable rubber or PTFE liner. The result is low operating torque, a bubble-tight shut-off over tens of thousands of cycles, and a compact face-to-face dimension that drops straight into existing flange gaps. The butterfly valve lever type version ships with an ergonomic locking lever that holds the disc at any throttling position; the same body accepts a gear box or pneumatic / electric actuator through the ISO 5211 pad.
Sizes run from DN50 to DN600 (2″ to 24″) in PN10 and PN16, with optional ANSI Class 150 drilling, JIS 10K and AS 2129 patterns for project-specific flange standards.
The lug style butterfly valve is a versatile shut-off and flow-regulating solution for industrial, municipal and marine systems – anywhere a compact quarter-turn valve has to hold pressure on a dead-end branch.
Buyers often ask which body style suits a line. Both are centerline quarter-turn valves with the same face-to-face dimension; the difference is in how they are bolted to the pipe and whether the valve can hold a dead-end.
Short face-to-face dimension and single-piece body keep weight and installation time low in both new builds and retrofits.
Smooth disc-seat geometry lets a small lever or a compact actuator drive the valve, cutting the size of the actuation package.
Rubber or PTFE liner is held in a machined seat groove, holding zero-leakage shut-off across tens of thousands of cycles.
4, 8 or 12 tapped lugs per body, machined to the flange standard you specify, so the valve holds pressure with one flange removed.
Body, disc, shaft and liner are selected per medium, so one valve family covers water, seawater, oil, gas and chemical duty.
ISO 5211 pad and standard keyway let a lever valve be converted to pneumatic or electric control without changing the body.
Sizes below are standard stock and production sizes for the PN10 / PN16 lug style butterfly valve. Larger sizes, special drilling and non-standard face-to-face lengths are available to order.
Every lug type butterfly valve leaving our facility is hydrostatically tested shell-and-seat before packing, then marked with size, pressure rating, body material and heat number. Castings are traceable to the foundry batch, and discs are profile-checked against the seat so the sealing pair stays matched after service replacement parts are fitted.
Ductile iron bodies, stainless steel discs and elastomer liners are selected for the medium in service, which keeps the valve leak-free in water, seawater, oil, gas and mild chemical duty. Test reports, material certificates and third-party inspection can be supplied with the shipment on request.
A lug style butterfly valve is used for dead-end service and bidirectional flow. Its tapped lugs let the valve be bolted to each pipe flange independently, so the downstream pipe can be removed for maintenance while the upstream side stays under pressure and sealed.
Choose lug type when the valve ends a line, sits on a pump discharge, or has to be serviced without draining the whole system. Choose wafer type when the valve is clamped between two flanges in a continuous line and cost or weight is the priority.
NBR for 0~70ºC water and oil, EPDM for 0~120ºC hot water and steam-adjacent duty, PTFE for -20~120ºC chemical service, FKM for 0~260ºC and silicone for -40~180ºC low-temperature lines.
A lever handle with locking notches, a hand wheel, a worm gear box, or a pneumatic / electric actuator mounted on the ISO 5211 top flange. The pad and keyway are standard, so the same valve body can be upgraded later.
Design and manufacture to API 609, EN 593 and BS 5155; face-to-face to ISO 5752 and DIN 3202; flange drilling to EN 1092-2, ANSI B16.5 Class 150, JIS 10K or AS 2129; tested to ISO 5208 and API 598.
Yes. We produce under buyer brands with custom nameplates, coatings, flange drilling and packaging, and quote wholesale prices for container and mixed-size orders. Send the size list, pressure rating and medium for a same-day quotation.
Send us the size, pressure rating and medium and our engineering sales team will return a quotation with the correct seat material and actuation option within 24 working hours.
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