New Product Launch: FITOK Single-Stage Diaphragm Regulators
Pressure regulators reduce an inlet pressure to a desired outlet pressure and maintain this outlet pressure even with fluctuations in the inlet pressure, and they are widely used in various piping systems. FITOK proudly introduces three series of single-stage regulators: RDSC series, RDGH series and RDGN series. All three regulators ensure excellent sensitivity and stable outlet pressure through a combination of metal diaphragm and free poppet.
RDSC Series Sensitive Diaphragm Regulators feature a large-diameter diaphragm to enhance sensitivity to pressure fluctuations, making them ideal for low-flow, high-sensitivity applications. RDGH Series Medium Flow Diaphragm Regulators are suitable for various gas media with medium to high flow. RDGN Series High Flow Diaphragm Regulators are designed with a reset spring to maintain stable and low outlet pressure, even under high flow conditions, making them ideal for various gas media with high flow.

RDSC Series Sensitive Diaphragm Regulators
Features
- Lift poppet and diaphragm are made of Alloy C-276, offering excellent corrosion resistance
- Metal-to-metal seal between valve body and diaphragm provides ensured sealing performance
- Reinforced diaphragm design extends diaphragm service life
- The bonnet includes a captured vent port, allowing media to be vented to a designated location in the event of an accidental diaphragm rupture
Technical Data
Port Size | 1/4", 3/8", 6 mm or 8 mm | ||
Max. Working Pressure | 4500 psig (310 bar) | ||
Outlet Pressure Range | 0 ~ 25 psig (0 ~ 1.7 bar) | ||
0 ~ 50 psig (0 ~ 3.4 bar) | |||
0 ~ 100 psig (0 ~ 6.9 bar) | |||
0 ~ 150 psig (0 ~ 10.3 bar) | |||
0 ~ 200 psig (0 ~ 13.8 bar) | |||
Flow Coefficient (Cv) | 0.06 | ||
Working Temperature | -40 ~ 165°F (-40 ~ 74°C) | ||
SPE (Supply Pressure Effect) |
0.5 psig per 100 psig source pressure change | ||
Leak Rate (Helium) | External | Inboard | ≤ 2×10-10 std cm3/s |
Outboard | ≤ 1×10-9 std cm3/s | ||
Internal | ≤ 4×10-8 std cm3/s |

RDGH Series Medium Flow Diaphragm Regulators
Features
- Large diameter diaphragm offers enhanced pressure sensitivity
- Balanced poppet design reduces SPE
- Metal-to-metal seal between valve body and diaphragm provides ensured sealing performance
- Reinforced diaphragm design extends diaphragm service life
- The bonnet includes a captured vent port, allowing media to be vented to a designated location in the event of accidental diaphragm rupture
Technical Data
Port Size | 3/8" to 3/4", 10 mm or 12 mm | ||
Max. Working Pressure | 500 psig (34.5 bar) 3000 psig (207 bar) |
||
Outlet Pressure Range | 0 ~ 25 psig (0 ~ 1.7 bar) | ||
0 ~ 50 psig (0 ~ 3.4 bar) | |||
0 ~ 100 psig (0 ~ 6.9 bar) | |||
0 ~ 150 psig (0 ~ 10.3 bar) | |||
0 ~ 200 psig (0 ~ 13.8 bar) | |||
Flow Coefficient (Cv) | 1.0 | ||
Working Temperature | PTFE, PCTFE: -40 ~ 165°F (-40 ~ 74°C) PEEK: -40 ~ 400°F (-40 ~ 204°C) |
||
SPE (Supply Pressure Effect) |
Max. Inlet Pressure: 500 psig | 2 psig per 100 psig source pressure change | |
Max. Inlet Pressure: 3000 psig | 0.5 psig per 100 psig source pressure change | ||
Leak Rate | External | Inboard | ≤ 2×10-10 std cm3/s (Helium) |
Outboard | ≤ 1×10-9 std cm3/s (Helium) | ||
Internal | Max. Inlet Pressure 500 psig: ≤ 4×10-8 std cm3/s (Helium) |
||
Max. Inlet Pressure 3000 psig: Bubble tight |

RDGN Series High Flow Diaphragm Regulators
Features
- Large diameter diaphragm offers enhanced pressure sensitivity
- Metal-to-metal seal between valve body and diaphragm provides ensured sealing performance
- Reinforced diaphragm design extends diaphragm service life
- The bonnet includes a captured vent port, allowing media to be vented to a designated location in the event of accidental diaphragm rupture
Technical Data
Port Size | 3/4" or 1" | ||
Max. Working Pressure | 500 psig (34.5 bar) | ||
Outlet Pressure Range | 0 ~ 15 psig (0 ~ 1.0 bar) | ||
0 ~ 30 psig (0 ~ 2.1 bar) | |||
0 ~ 75 psig (0 ~ 5.2 bar) | |||
0 ~150 psig ((0 ~ 10.3 bar) | |||
Flow Coefficient (Cv) | 1.8 | ||
Working Temperature | -40 ~ 74°C (-40 ~ 165°F) | ||
SPE (Supply Pressure Effect) | 4.5 psig per 100 psig source pressure change | ||
Leak Rate | External | Inboard | ≤ 2×10-10 std cm3/s (Helium) |
Outboard | ≤ 1×10-9 std cm3/s (Helium) | ||
Internal | Bubble tight |
In addition to RDSC, RDGH and RDGN series pressure regulators, FITOK offers single-stage tied diaphragm regulators (RTGC Series General Tied Diaphragm Regulators, RTCC Series Miniature Tied Diaphragm Regulators), single-stage piston regulators (RPGX Series High Pressure Piston Regulators, RPGN Series High Flow Piston Regulators and RPCC Series Compact Piston Regulators), RDDC Series Two-Stage Diaphragm Regulators, which are designed to minimize supply pressure effect, and RDCC Series Miniature Diaphragm Regulators for vacuum outlet pressure control.
Please see the catalogs for RDSC, RDGH, and RDGN series for more information. Should you have any questions, please contact us directly and we will reach you soon.
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