2 in (50 mm) NBR Lugged Butterfly Valve | VWLG50

This AAP NBR lugged butterfly valve has a ductile iron body, an SS316 disc, an NBR seat and a lever. It is supplied in 9 sizes from 2 in (50 mm) to 12 in (300 mm).

A butterfly valve turns a disc on a central stem through a quarter turn: with the disc in line with the flow the valve is open, and turned across the flow it is closed. The resilient seat is the soft liner the disc seals against. AAP says its resilient seat butterfly valves are compact, give bubble tight shut-off and have good regulating capabilities, and lists them for HVAC, petrochemical, pulp and paper, water and wastewater treatment, brewing, food processing, mining, textile and general industry (manufacturer-stated).

Like the wafer style, the lugged body is compact, but it has lugs cast into the body and tapped with a metric thread, so a flange can be fixed on one side at a time. AAP says this lets you mount the valve at the end of a pipeline without a flange on the downstream (discharge) side (manufacturer-stated).

AAP gives a cold working pressure of 1,600 kPa (16 bar) for its 50 mm to 300 mm lugged valves, with a top flange to ISO 5211 (manufacturer-stated).

The seat is NBR (nitrile). AAP gives NBR a temperature of 100 degrees C, says it is generally resistant to many hydrocarbons, fats, oils, greases and hydraulic fluids and is generally affected or attacked by ozone, ketones, esters, aldehydes and chlorinated and nitro hydrocarbons (all manufacturer-stated). The seat temperature is a material figure, not a valve rating, so ask AIMS for the pressure and temperature rating if the valve will run hot.

AAP lists its Watermark approval against the 50 mm to 300 mm EPDM version only, so it does not cover this seat material. If you need a drinking water approval, ask AIMS about the EPDM valve and for the current certificate.

AAP gives one operating torque per size at PN16 and does not say which seat material it applies to, so allow a margin when you size an actuator.

Where this product is used

• HVAC, chilled and hot water services
• Water and wastewater treatment pipework
• Food, brewing and process plant isolation
• Mining, pulp and paper and general industrial pipework

Features

• 9 sizes from 2 in (50 mm) to 12 in (300 mm)
• Lugged body with tapped lugs, so one side can be unbolted at a time
• Seat: NBR (nitrile)
• Cold working pressure 1,600 kPa (16 bar) (manufacturer-stated)
• Top flange to ISO 5211 (manufacturer-stated)

Materials

Seat material guide

Drive, bolt hole and torque dimensions

Key specifications

Options and part numbers

Dimensions are in mm and use the letters in AAP's catalogue, which does not define them. L is the face-to-face length. Check the drawing in the attached catalogue section.

Selecting the right option

Choose the size to match your pipe, and choose wafer or lugged to suit how the valve will be mounted. Check the seat material against your fluid and temperature using the seat material guide on this page. A lever suits on and off duty. For fine regulation AAP says to use a gear operator, because levers and notch plates only have 10 position settings.

Related products

See also AAP Lugged Butterfly Valve, EPDM Seat, Stainless Steel Disc, AAP Lugged Butterfly Valve, NBR Seat, ANSI 150, AAP Lugged Butterfly Valve, NBR Seat, Table D, AAP Wafer Butterfly Valve, NBR Seat, Stainless Steel Disc and AAP Gear Operators for Butterfly Valves.