Pre Insulated Butterfly Valve for HVAC

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Key Features

  • Lining and metallurgy to suit a wide variety of applications.
  • Integrally moulded seat liner on the body, which ensures excellent dimensional stability & guaranteed sear tightness.
  • Pre Thermo Insulated Butterfly Valves, which avoids the cost and manpower incurred by the customer in insulating the valve after installation.
  • Integral Thermo Insulation Technology also avoids the reinsulation cost often incurred in conventional insulation techniques.
  • Seat liner extending on to the contact faces ensures perfect sealing and eliminates the need for separate flange gaskets.
  • Excellent Triple Sealing System (TSS) for shaft sealing ensures zero leakage from shaft seals.
  • A fully universal body design ensures fitment of the valve between companion flanges of all popular standards (viz: ANSI, BS, DIN, JIS, IS etc)
  • A ten position notch disc and hand lever ensures locking of the valve in 8 intermediate position in addition to closed and open position. Hand lever lockable through pad lock for tamper proof positioning.
  • Body castings made of superior FG 260 grade cast iron / Ductile Iron ensure additional strength.
  • Valve disc made of ductile cast iron instead of cast iron to withstand against possible water hammer of pressure surges.
  • Both top and bottom shaft swiveling are guided by self-lubricated PTFE bearings.
  • Fool proof hand lever designed to prevent accidental pinching of hand between the handle and locking lever.

Technical Details

Valve Type entric Disc Butterfly valve with internally moulded rubber lined body.
Body Type Short wafer type body widely suitable in various applications.
Material FG 220 / FG 260 / DI / CS / SS / Any material as per customer specification.
Seat Type Integrally moulded rubber with the body.
Seat Material EPDM, NITRILE, BUNA N, VITON Rubber.
Disc Centric Disc made of Ductile Iron.
Shaft SS 410
End Connection Wafer and Lugged Models.
Size range 40 NB to 600 NB.
Pressure Rating PN10, PN16, PN20 & PN25.
Operating temperature range -500C to 2300C (depending on MOC)
Seat leakage Tight shut off.
Operation Hand lever for sizes from 40 NB to 250 NB. Worm gear boxes for 300 NB and above.
Overall conformity to Standard API 609 category A/BS 5155/MSS SP-67/IS 13095.
Flange conformity Standard IS 6392 NP 0.6 / 1.0, ANSI 150, DIN PN6/10, Bs10 Tab D & E, JIS 5K/10K.
Valve face to face Short wafer as per ISO 5752 Tab 5/API 609 Category A dimensions.
Top flange drilling ISO 5211 part II

ADVANTAGES OF PRE INSULATED VALVES

  • Closed Cell Content: > 95%
  • Water absorption: < 0.1%
  • Easy to fix at the site
  • No damage and dissipation
  • In built Temperature control mechanism introduced first time ever.
  • Best Energy Saving
  • Low thermal conductivity

Thermal expansion of polyurethane Foam (PUR) without facings in the temperature range -600C to +800C, measured in relation to density.

Pre Thermo Insulated Valves


DIMENSION (in mm.) With pressed steel handlever

Valve Size 40 50 65 80 100 125 150 200
A 40 50 65 80 100 125 150 200
B 33 43 46 46 52 56 56 60
C 53 59 67 75 94 108 120 147
D 103 113 121 128 146 158 174 198
E 133 143 151 158 176 188 206 230
F 265 265 235 265 265 265 375 375
WT.(kg) 1.8 2.2 2.7 3.3 5 6.5 8 11
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