Resilient Seated, High Performance
Delta T, a brand of Max-Air Technology, is dedicated to the manufacturing and distribution of high-quality valve products to the flow control industry. Delta T is focused on quarter turn butterfly valve solutions, from standard resilient butterfly valves, high performance valves (double and triple offset), control butterfly valves, as well as manual gearing, declutchable gearing, stem extensions, and chain & handwheel options. We also are well versed in tee and wye assemblies with linkage.
Need information on how to get our products? Send us an inquiry!
050/051, 650/651 Series
Resilient Seated
- Iron Body Butterfly Valve; sizes 1-1/2” – 48”
- Stainless Steel Body Butterfly Valve; sizes 2” – 24”
- Wafer and Lugged Body Styles Available
- Manual Valves with handle or gear operator available
- ISO 5211 mounting patterns for ease of actuation
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ABS Type Approval, Certificate Pending
- Coast Guard, NSF – Approvals
Sales Literature
Cut Sheets
050/051 Submittal Drawings
650/651 Submittal Drawings
CE, PED, CRN
250/251 Series
Resilient Seated
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Industry Leading 3-Year Limited Warranty
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250 Series Wafer Ductile Iron Body sizes 2” – 24”
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251 Series Lug Ductile Iron Body sizes 2” – 24”
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Bi-Directional Shutoff 250 PSI
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Bi-Directional Dead End Service 250 PSI (Lug only)
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Install between Standard ANSI class 125/150 flanges
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250 Series Wafer also compatible with PN10/PN16 flanges
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ISO 5211 square drive shaft for optional automation
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Conforms to MSS-SP-67, MSS-SP-25, API 609
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Designed for blowout-proof service
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Permanent Integral Seat Design
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Vacuum service capable (Please consult factory)
800 Series | Double Offset
High Performance
(Series 850, 851, 852, 853, 860, 861, 862, 863, 871)
- ANSI 150, 300, & 600 in all styles
- Wafer, Lugged, & Flanged styles
- WCB & CF8M bodies stocked
(A broad selection of other materials available) - Blow out proof stem design
- Stainless Steel disc & stem standard on stocked trims
- TFM 1600 seats are standard, other soft seats are available
- Fire Safe & Metal seated versions are available
- ISO 5211 mounting is standard. (Direct mount for 12” & smaller, w/ included bracket on larger size)
- Class VI / bubble tight bi-directional sealing on all soft seated trims
- Dead End service to full pressure rating in preferred direction
- Control trim w/ anti-noise & anti-cavitation features available
Sales Literature
Submittal Drawings
IOM Manual
Series Designations
- 850 – CLASS 150 – ANSI/DIN WAFER
- 851 – CLASS 150 – ANSI LUG
- 852 – CLASS 150 – DIN LUG
- 853 – CLASS 150 – ISO 5752 FLANGED (SHORT)
- 860 – CLASS 300 – ANSI/DIN WAFER
- 861 – CLASS 300 – ANSI LUG
- 862 – CLASS 300 – DIN LUG
- 863 – CLASS 300 – ISO 5752 FLANGED (SHORT)
- 871 – CLASS 600 – ANSI LUG
C Series | Double Offset
High Performance
Cavitation Control
(Series C50, C51, C52, C53, C60, C61, C62, C63)
Diffuser is defined as “A device for reducing the velocity and increasing the static pressure of a fluid passing through a system”. Delta T’s unique diffuser plate butterfly valve does that by incorporating a spherical edged disc with the diffuser plate to direct and diffuse the flowstream. This optimizes the ability to control flow and minimizes noise, cavitation and damaging high velocity jets of fluid. In the first 30° of rotation, when pressure drop is the highest, the spherical edged disc constrains the flow, directing it through the diffuser to minimize the potential for damaging flow conditions.
- ANSI Class 150 and 300 in Wafer, Lugged, & Flanged body styles
- Available in a broad selection of materials
- WCB and CF8M bodies standard
- CF8M Stainless Steel disc and stem standard
- Soft, fire safe, & metal seats available
- Metal seats (high temperature, corrosive services, metallurgical-sensitive applications) w/ Class IV shutoff
- ISO 5211 actuator mounting is standard, direct mounting on 12 inch and smaller
- Control & anti-cavitation trim plate provides a high level of control and noise reduction within the first 30° of rotation
- Soft seated trims offer bi-directional class VI shutoff
- Clean, field repairable design
Patented Spherical-Disc Diffuser-Plate Design
This is NOT just a modified butterfly valve; it is uniquely patented design that overcomes some of the limitations of classic control valves. Compared to the industry standard Globe Valve, this design has improved control at lower flow rates, better range-ability, higher flow capacity, reduced noise and vibration, and all at a lower cost.
Sales Literature
Submittal Drawings
IOM Manual
Design Advantages
- Unparalleled Range-Ability w/ Equal Percentage Flow
Controllable Range 5°-85° (Rangeability up to ~600:1)
Optimal Control Range 10°-70° (Rangeability up to ~100:1) - Fine-Tuned Low Flow Control and High Flow Capacity
- Reduced Noise & Vibration
Series Designations
- C50 – CLASS 150 – ANSI/DIN WAFER
- C51 – CLASS 150 – ANSI LUG
- C52 – CLASS 150 – DIN LUG
- C53 – CLASS 150 – ISO 5752 FLANGED (SHORT)
- C60 – CLASS 300 – ANSI/DIN WAFER
- C61 – CLASS 300 – ANSI LUG
- C62 – CLASS 300 – DIN LUG
- C63 – CLASS 300 – ISO 5752 FLANGED (SHORT)
900 Series | Triple Offset
(Series 950, 951, 952, 953, 954, 960, 961, 962, 963, 964, 970, 971, 972, 973, 974)
- ANSI 150, 300, & 600 in all styles
- Wafer, Lugged, & Flanged styles
- A broad selection of materials available
- Blow Out Proof stem design
- Stainless Steel disc & stem standard on stocked trims
- TFM 1600 Seats are standard, other soft seats are available
- Fire Safe & Metal seated versions are available
- Class VI / Bubble Tight sealing in preferred direction
- Dead End Service to full pressure rating in preferred direction
- Replaceable body disc
Sales Literature
Submittal Drawings
Series Designations
- 950 – CLASS 150 – ANSI/DIN WAFER
- 951 – CLASS 150 – ANSI LUG
- 952 – CLASS 150 – DIN LUG
- 953 – CLASS 150 – ISO 5752 FLANGED (SHORT)
- 954 – CLASS 150 – B16.10 FLANGED (LONG)
- 960 – CLASS 300 – ANSI/DIN WAFER
- 961 – CLASS 300 – ANSI LUG
- 962 – CLASS 300 – DIN LUG
- 963 – CLASS 300 – ISO 5752 FLANGED (SHORT)
- 964 – CLASS 300 – B16.10 FLANGED (LONG)
- 970 – CLASS 600 – ANSI/DIN WAFER
- 971 – CLASS 600 – ANSI LUG
- 972 – CLASS 600 – DIN LUG
- 973 – CLASS 600 – ISO 5752 FLANGED (SHORT)
- 974 – CLASS 604 – B16.10 FLANGED (LONG)
