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FFF pneumatic on/off valves are angle-seat valves with CF8M steel body, threaded or socket weld connections and a servo control made of 304 stainless steel. Seal on the valve seat is soft type, and can be made of different materials according to customer's needs. Tightness on stem is guaranteed by packing glands made of PTFE + graphite-loaded PTFE.
| TECHNICAL DATA | |||||
| Valve type | 2-way ball valve, with oblique angle body, unidirectional (under shutter flow). | ||||
| Servo Control | 25 | 32 | 70 | 80 | 125 |
| DN | 5 (1/4”) | 8 (1/4”) ÷ 20 (3/4”) | 15 (1/2”) ÷ 25 (1”) | 25 (1”) ÷ 50 (2”) | 40 (1”1/2) ÷ 65 (2”1/2) |
| Max. allowed P | 40 bar (DN 5÷11); 16 bar (DN 15÷65) | ||||
| Min. allowed P | 0 bar | ||||
| Connections | FF GAS; Socket welding | ||||
| Seal | PTFE | EPDM, PTFE-coated EPDM, PTFE | |||
| Max Temperature | +150 °C with EPDM seal | ||||
| +155° with PTFE-coated EPDM seal | |||||
| +150 °C. | +200 °C with PTFE seal | ||||
| Min Temperature | -10°C (in liquid phase) | ||||
| Air couplings | RILSAN quick coupling Ø 6-4 mm. | ||||
| Feeding fluid | instrument air | ||||
| Feeding pressure | 6 – 8 bar | ||||
| Optional | inductive or magnetic sensors; pneumatic or electromechanical limit switches; stroke limit switches; solenoid valves | ||||
| MATERIALS | ||
| Intermediate body | CF8M | |
| Middle section | CF8M | CF8 + S31600 + S30400 |
| Stem | S31600 | |
| Shutter plate | S31600 | |
| Seat seal | PTFE | EPDM, PTFE-coated EPDM, PTFE |
| Stem seal | FPM | PTFE+GRAPHITE-LOADED PTFE |
| Body gaskets | FPM | PTFE (DN 8#50) / NOVATEC or GRAPHITE+KEVLAR (DN 65) |
| Servo Control | CF8M+S30400 | S30400 |
| Air consumption table | |||||
| AIR CONSUMPTION OF FFF SERIES VALVES [ Nl / cycle] | |||||
| CONTROL PRESSURE | Servo control 25 | Servo control 32 | Servo control 70 | Servo control 80 | Servo control 125 |
| 6 bar | 0.016 | 0.087 | 0.824 | 1.182 | 4.982 |
| Table p of sealing (bar) for N.C. valves - without air supply. | ||||||||||
| Servo Control | DN 5 | DN 8 | DN 11 | DN 15 | DN 20 | DN25 | DN32 | DN40 | DN50 | DN65 |
| 25 | 40 | - | - | - | - | - | - | - | - | - |
| 32 | - | 20 | 12 | 7 | 4 | - | - | - | - | - |
| 70 | - | - | - | 16 | 14 | 9,5 | 6,5 | 4 | 2,5 | - |
| 80 | - | - | - | - | - | - | - | - | - | - |
| 125 | - | - | - | - | - | - | - | 16 | 16 | 12 |
| DN | 5 | |
| Ø A | 1/4" GAS | |
| B | 9 | |
| C | 50 | |
| D | 15,5 | |
| E | 28,5 | |
| Ø F | 34 | |
| H | CLOSED | 84,5 |
| OPEN | 88,5 | |
| I | CLOSED | 99 |
| OPEN | 103 | |
| Kv [ m3/h ] | 0,66 | |
Nordsteam Katalog