SPDST Series Product Applications
This SPDST (Diaphragm Design) tee valve series is designed for high-performance gas and chemical distribution systems combined with the lowest operating cost, make this valve an excellent consideration for:
High-purity gas distribution system control
High-purity gas valves for point-of-use service
Superior containment and cleanliness for your most critical valve applications
Suitable for inert and most spec. gases
SPDS Series Product Features
High Cv Manual Diaphragm Valve, Compact "T" Round Body Design
Ultra-High Purity Bar Stock Stainless Steel/PCTFE/Vespel Valve Construction
**Elgiloy Tied-Diaphragm for Maximum Flow on Valve Sizes-.500" and.750" Only
Springless, Packless Design-Low Dead Volume/ Internal Flowpath
10 Ra Max-Electropolished Surface Finish- Std (Optional Surface Finishes Available)
Purge Connections and Purge Valves are Integrated in Valve Body
Valve Body and Tube Stubs are Serialized for Material Certification
SPDST Construction Materials
SPDST Series Technical Data
| MATERIAL OF CONSTRUCTION | Wetted Areas | *Elgiloy®, 316L Stainless Steel, PCTFE |
| Non-Wetted Areas | 316L Stainless Steel, 303 Stainless Steel | |
| MAXIMUM OPERATING PRESSURE | SPDST 250 & 375 & 525 | Vacuum to 375 psig (0-25.8 bar) |
| SPDST 500 & 755 | ||
| SPDST 750 & 1075 | ||
| MAXIMUM OPERATING TEMPERATURE | PCTFE Seat – Std | -22°F (-30°C) to 180°F (82°C) |
| *Vespel® Seat (High Temp) | 181°F (83°C) to 302°F (150°C) | |
| INTERNAL VOLUME | SPDST 250/250 | 0.124 in³ (2.032 cm³) |
| SPDST 375/375 | 0.177 in³ (2.901 cm³) | |
| SPDST 525/250 | 0.177 in³ (2.901 cm³) | |
| SPDST 525/375 | 0.177 in³ (2.901 cm³) | |
| SPDST 500/250 | 0.816 in³ (13.374 cm³) | |
| SPDST 500/375 | 0.816 in³ (13.374 cm³) | |
| SPDST 500/500 | 0.816 in³ (13.374 cm³) | |
| SPDST 755/500 | 0.816 in³ (13.374 cm³) | |
| SPDST 750/750 | 1.881 in³ (30.824 cm³) | |
| SPDST 1075/750 | 1.881 in³ (30.824 cm³) |
*Vespel® is a registered trademark of DuPont Company.
**Elgiloy® is a registered trade mark of Elgiloy Specialt Metals
| VALVE MODELS | BODY DATA | FLOW COEFFICIENT |
| (SeriesSize-Inch) | (Tube/Body (Seat-Orifice) Sizes) | Cv |
| SPDST 250/250 | Ø.250 / .250 (.250 in. (Ø6.35mm)-Orifice) | 0.41 |
| SPDST 375/375 | Ø.375 / .250 (.250 in. (Ø6.35mm)-Orifice) | 0.64 |
| SPDST 525/250 | Ø.500 / .250 (.250 in. (Ø6.35mm)-Orifice) | 0.68 |
| SPDST 525/375 | Ø.500 / .250 (.250 in. (Ø6.35mm)-Orifice) | 0.70 |
| SPDST 500/250 | Ø.500 / .500 (.500 in. (Ø12.7mm)-Orifice) | 2.81 |
| SPDST 500/375 | Ø.500 / .500 (.500 in. (Ø12.7mm)-Orifice) | 2.81 |
| SPDST 500/500 | Ø.500 / .500 (.500 in. (Ø12.7mm)-Orifice) | 2.81 |
| SPDST 755/500 | Ø.750 / .500 (.500 in. (Ø12.7mm)-Orifice) | 3.15 |
| SPDST 750/750 | Ø.750 / .750 (.625 in. (Ø15.9mm)-Orifice) | 4.70 |
| SPDST 1075/750 | Ø1.000 / .750 (.625 in. (Ø15.9mm)-Orifice) | 4.36 |
| HELIUM LEAK TEST | Inboard | ≤ 1 x 10⁻⁹ std.cc (atm) He / sec |
| Across the Seat | ≤ 1 x 10⁻¹⁰ std.cc (atm) He / sec | |
| Outboard Pressure Test | ≤ 1 x 10⁻⁶ std.cc (atm) He / sec | |
| CLEANLINESS AND PACKAGING | Assembled and tested in Class 100 Cleanroom. Purged and Final Packaged in Class 1 Cleanroom. Double-bag Packaging (2 mil nylon inner bag, 6 mil polyethylene outer bag) with Ultra-High Purity N₂ gas environment. | |
| STANDARD FINISH | 10 Ra Max – Electropolished Surface Finish – Std (Optional surface finishes available) | |
| NOTES AND OPTIONS | Testing: Particle, Moisture, O₂, SEM, ESCA, and AE SPurge Connection – Valve Type/Location Size .250 Valve Connection Ends – Inlet/Outlet Sizes .250 to 1.000 Valve Body Mounting Holes Std. Options: 1) SPDST 250 to 750 – M5 x 0.8 or 10-32UNC-2B Integral Lock-out Design Handle – Sizes .250 / .500 | |
Specifications are subject to change without notice.
SPDST Series Technical Dimensions
| SERIES/SIZE (INCH) | A | B | C | D | E | F | G | H | J | K | L | M |
| SPDST 250/250 | Ø 250 (6.4mm) | 0.035 (0.89mm) | 0.50 (12.7mm) | 3.04 (77.2mm) | 7.35 (186.7mm) | Ø 250 (6.4mm) | 0.035 (0.89mm) | 3.68 (93.5mm) | 1.98 (50.3mm) | 2.55 (64.8mm) | 6.23 (158.2mm) | 4.68 (118.9mm) |
| SPDST 375/375 | Ø 375 (9.5mm) | 0.035 (0.89mm) | 0.50 (12.7mm) | 3.04 (77.2mm) | 7.35 (186.7mm) | Ø 375 (9.5mm) | 0.035 (0.89mm) | 3.68 (93.5mm) | 1.98 (50.3mm) | 2.55 (64.8mm) | 6.23 (158.2mm) | 4.68 (118.9mm) |
| SPDST 525/250 | Ø 500 (12.7mm) | 0.049 (1.2mm) | 0.50 (12.7mm) | 3.04 (77.2mm) | 7.35 (186.7mm) | Ø 250 (6.4mm) | 0.035 (0.89mm) | 3.68 (93.5mm) | 1.98 (50.3mm) | 2.55 (64.8mm) | 6.23 (158.2mm) | 4.68 (118.9mm) |
| SPDST 525/375 | Ø 500 (12.7mm) | 0.049 (1.2mm) | 0.50 (12.7mm) | 3.04 (77.2mm) | 7.35 (186.7mm) | Ø 375 (9.5mm) | 0.035 (0.89mm) | 3.68 (93.5mm) | 1.98 (50.3mm) | 2.55 (64.8mm) | 6.23 (158.2mm) | 4.68 (118.9mm) |
| SPDST 500/250 | Ø 500 (12.7mm) | 0.049 (1.2mm) | 0.46 (11.7mm) | 3.04 (77.2mm) | 8.08 (205.2mm) | Ø 250 (6.4mm) | 0.035 (0.89mm) | 4.04 (102.6mm) | 2.34 (59.4mm) | 2.91 (73.9mm) | 7.00 (177.8mm) | 5.29 (134.4mm) |
| SPDST 500/375 | Ø 500 (12.7mm) | 0.049 (1.2mm) | 0.46 (11.7mm) | 3.04 (77.2mm) | 8.08 (205.2mm) | Ø 375 (9.5mm) | 0.035 (0.89mm) | 4.04 (102.6mm) | 2.34 (59.4mm) | 2.91 (73.9mm) | 7.00 (177.8mm) | 5.29 (134.4mm) |
| SPDST 500/500 | Ø 500 (12.7mm) | 0.049 (1.2mm) | 0.46 (11.7mm) | 3.04 (77.2mm) | 8.08 (205.2mm) | Ø 500 (12.7mm) | 0.049 (1.2mm) | 4.04 (102.6mm) | 2.34 (59.4mm) | 2.91 (73.9mm) | 7.00 (177.8mm) | 5.29 (134.4mm) |
| SPDST 755/500 | Ø 750 (19.1mm) | 0.065 (1.65mm) | 0.46 (11.7mm) | 3.04 (77.2mm) | 8.08 (205.2mm) | Ø 500 (12.7mm) | 0.049 (1.2mm) | 4.00 (101.6mm) | 2.34 (59.4mm) | 2.91 (73.9mm) | 7.00 (177.8mm) | 5.25 (133.4mm) |
| SPDST 750/750 | Ø 750 (19.1mm) | 0.065 (1.65mm) | 0.69 (17.5mm) | 3.06 (77.7mm) | 8.59 (218.2mm) | Ø 750 (19.1mm) | 0.065 (1.65mm) | 4.29 (109.0mm) | 2.65 (67.3mm) | 3.20 (81.3mm) | 7.50 (190.5mm) | 5.79 (147.1mm) |
| SPDST 1075/750 | Ø 1.000 (25.4mm) | 0.065 (1.65mm) | 0.69 (17.5mm) | 3.06 (77.7mm) | 8.59 (218.2mm) | Ø 750 (19.1mm) | 0.065 (1.65mm) | 4.29 (109.0mm) | 2.65 (67.3mm) | 3.20 (81.3mm) | 7.50 (190.5mm) | 5.79 (147.1mm) |
SPDST Series Typical Valve Dimensions
SPDST Series Ordering Code
