DelVal Butterfly Valve Series 44 to 49 High Performance Double Offset

Description: 

• Body Style: Wafer, Lug, Double Flanged

• Body: CS, SS

• Disc: CF8M, CF8

• Stem: 316 SS, 17-4 PH, XM-19

• Seat: Ultra, PTFE, RTFE, Metal (SS, Inconel), Firesafe

• Size Range: Series 44, 45 –  2" to 48“ (DN 50 to 1200), Series 47, 48 – 2” to 24” (DN 50 to 600), Series 46 –  3" to 48“ (DN 80 to 1200), Series 49 –  3" to 24“ (DN 80 to 600)

• Pressure Rating: Series 44, 45, 46 - Class 150, Series 47, 48, 49 - Class 30

• Design Standard: API 609 Category B, BS EN 593

• Testing Standard: API 598, BS EN 12266-1

Design and Specifications:

Double Offset Design is a design that produces a cam-like action in disc motion. This movement can prolong service life and reduce operating torque. This can happen because that cam-like action eliminates seat deformation and seat wear.

Seat Design: 

• Soft Seat: Has a flexible design that retains its original shape and is self-energizing and maintains a seal on the disc regardless of the direction of flow.
• Fire Safe Seat: When tough material is partially or completely destroyed during or after fire, a backup metal seat ring provides a two-point contact seals in either direction of media flow.
• Metal Seat: It has very high sealing ability and low leakage rate due to its mechanical properties and the shape of the metal holder can maintain a fixed positive seal on the disc.

Special Applications: 

• Vacuum: Standard delicate seat and fire safe seat valves are appraised for tight shut-off of vacuum to 1 mbar.
• Oxygen: Valves for basic vaporous oxygen administration are extraordinarily ready, cleaned, examined, gathered and tried to guarantee expulsion of all burrs, sharp edges, soil, hydrocarbon oil or oil and different impurities.
• NACE Service: Valves adjusting to NACE MR0175 and MR0103 are accessible. These valves are appropriate for oil and gas industry applications requiring safe materials to sulfide stress breaking.
• Steam: Valves are reasonable for immersed steam up to 14 bar for CL150 and up to 31 bar for CL300 with ULTRA seat (with seat temperature limits per pressure-temperature chart, and suitable pressing and seals to be picked in light of plan temperature conditions).

Temperature Limits: