Products - Centrum Petroleum Machinery Limited Company

Products name:Butterfly Valve
Product Description:

Butterfly Valves



One piece ribbed wafer and lugged body is Polyester coated as standard for a superior appearance and excellent resistance to external corrosion.
Heavy duty ISO5211 Top plate is slotted for use of actuation and engineered to accept direct mounting of operators.
Standard extended neck provides full clearance for 2" of insulation.

Streamlined design offers higher CV and lower pressure drop.
Machined Double D drive ensures close tolerances thereby elimating the imprecision commonly found in the cast-in drives offered by our competitors.

Triple shaft seals support the primary seal on machined radius of the disc. Our triple shaft seals ensure a dry stem design.
Two secondary shaft seals are located inside the seat shaft holes and an environmental shaft seal eliminates contaminates from entering the shaft bore.
Two self lubricated bronze bearings offer consistent torque value and eliminate side loading.
Disc/Shaft Connection

A high strength machined Double D drive ensures a positive shaft to disc connection.
Disc floats inside the seat for positive sealing and extended seat life.
No pins or bolts are exposed to flow.
Offset shaft retainers mechanically retain the shaft in the body ensuring a blow out proof design.
Manual Controls

Handle Kit
The Handle Kit is designed for manual on/off and throttling service for quarter turn, resilient seated butterfly valves ranging from 2" - 12". The Polyester coated ductile iron handle kit includes the handle assembly with a locking lever and bolt on plate notched at 10 degree increments. The notched plate also includes on/off stops to prevent over travel of the handle and can be used with a padlock as standard. Other available options include an Infinite Throttling Handle Kit, Memory Stop and a 2" Square Nut.
Handwheel Gear Kit
The Handwheel Gear Operator is designed for manual on/off and throttling service for quarter turn butterfly valves ranging from 2"?-12".The Handwheel gear operator's constructed with a heavy duty, Polyester coated cast iron housing, is Completely self lubricated and weatherproof. Along with the gear operator, it also includes a valve position indicator, ductile iron Handwheel and mechanical travel stops for field adjustment. Other available options include a Chainwheel Kit, Padlock Kit and a 2" Square Nut.

Materials of Construction 2" - 12"

Cast Iron ASTM A126 Class B
Ductile Iron ASTM A-536 (65-45-12)
Ductile Iron ASTM A395 (60-40-18)
Electroless Nickel Plated Ductile Iron ASTM A536 (65-45-12)
Aluminum Bronze ASTM B148 (954)
Nylon 11 Coated Ductile Iron ASTM A536 Grade (65-45-12)
316 Stainless Steel ASTM A351 (CF8M)
316 Stainless Steel ASTM A276 Type 316
416 Stainless Steel ASTM A582 Type 416
Phosphate coated steel


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