Description
Product Overview
Spirax Sarco PN9400 series pneumatic actuators are compact linear diaphragm actuators. Engineered for installation on Spira-trol K and L series DN125 to DN300, C series, and QL series control valves, these units position valve plugs against varying differential pressure requirements.
Each actuator incorporates a fully-rolling diaphragm providing linearity over the 80 mm operating stroke. A mechanical travel indicator comes standard for continuous visual stroke verification. Units are supplied with polyester powder coating as standard, with options for stainless steel bolting or a top-mounted handwheel.
Key Features
- Fully-rolling reinforced NBR diaphragm ensuring stroke linearity across the full 80 mm travel.
- Integral mechanical travel indicator providing direct local position monitoring.
- Choice of two spring configurations delivering 10,000 N or 20,000 N operating thrust.
- Available in both spring-extend (normally closed) and spring-retract (normally open) operation.
- Polyester powder coated carbon steel housings with ductile iron yoke.
- Optional manual handwheel mechanism for local mechanical override.
- Optional stainless steel external bolting for corrosive operating environments.
Technical Specifications
| Parameter | Specification |
|---|---|
| Temperature range | -20 °C to +80 °C |
| Maximum operating inlet pressure | 4 bar g |
| Air supply connection | 2 x 1/2” NPT |
| Actuator travel | 80 mm |
| Diaphragm area | 1110 cm² |
| Action types | Spring-extend (E) / Spring-retract (R) |
| Standard finish | Polyester powder coated (PN) |
Dimensions and Weights
| Actuator Model | F (mm) | G (mm) | H (mm) | I (mm) | Standard Weight (kg) | Weight With Handwheel (kg) |
|---|---|---|---|---|---|---|
| PN94_6E | 732 | 465 | 300 | 1120 | 60 | 30 |
| PN94_3E | 732 | 465 | 300 | 1120 | 60 | 30 |
| PN94_6R | 732 | 465 | 300 | 1050 | 60 | 28 |
| PN94_3R | 732 | 465 | 300 | 1050 | 60 | 28 |
Applications
- Spira-trol K Series two-port control valves (DN125 to DN300)
- Spira-trol L Series two-port control valves (DN125 to DN300)
- Spira-trol C Series control valves
- Spira-trol QL Series control valves
- Differential pressure throttling and shut-off service across industrial steam, gas, and liquid systems
Selection Guide
| Designation | Code | Description |
|---|---|---|
| Type | PN | Polyester powder coated (standard) |
| Series | 9 | 9000 series |
| Actuator size | 4 | 1110 cm² diaphragm area |
| Valve travel | 8 | 80 mm |
| Spring rating and thrust | 3 | Min. 1.8 - 3.0 bar Max. (Thrust force 20,000 N) |
| Spring rating and thrust | 6 | Min. 0.9 - 1.5 bar Max. (Thrust force 10,000 N) |
| Spring action | E | Spring-extend (Closed) |
| Spring action | R | Spring-retract (Open) |
| Option - Bolting | S | Stainless steel |
| Option - Handwheel | H | Handwheel override |
Nomenclature example: PN9483E describes a polyester powder coated 9000 series actuator, 1110 cm² diaphragm area, 80 mm stroke, 1.8 to 3.0 bar spring rating with 20,000 N force, spring-extend action.
Materials of Construction
| No. | Part | Material |
|---|---|---|
| 1 | Yoke | SG iron |
| 2 | Bearing and seal insert | Carbon steel |
| 3 | Bearing | PTFE/steel composite |
| 4 | Seal | Polyurethane |
| 5 | Gasket | Reinforced graphite |
| 6 | Housing lower | Carbon steel |
| 7 | Spindle | Stainless steel |
| 8 | Diaphragm protection plate | Carbon steel |
| 9 | Diaphragm | Reinforced NBR |
| 10 | Spacer | Carbon steel |
| 11 | Spring | Carbon steel |
| 12 | Housing upper | Carbon steel |
| 13 | Lock-nut | Carbon steel |
| 14 | Up guide | Carbon steel |
| 15 | Screw | Carbon steel |
| 16 | Screw | Carbon steel |
| 17 | Screw | Carbon steel |
| 18 | Nut | Carbon steel |
| 19 | Connector | Stainless steel |
| 20 | Adaptor | Stainless steel |
| 21 | Collar | Stainless steel |
| 22 | Clamp | Stainless steel |
| 23 | Scale | Stainless steel |
| 24 | Lock-nut | Carbon steel |
| 25 | Screw | Carbon steel |
| 26 | Nut | Carbon steel |
| 27 | Screw | Carbon steel |
| 28 | Nut | Carbon steel |
| 29 | Screw | Carbon steel |
| 30 | ‘O’ ring | Viton |
| 31 | Vent plug | Brass |
| 32 | Washer ‘O’ ring | Carbon steel |
| 33 | Intermediate plate | Carbon steel |
| 34 | Diaphragm guide plate | Carbon steel |
| 35 | Spring plate | Carbon steel |
| 36 | Spring guide plate | Carbon steel |
| 37 | Cap protection | Plastic |
| 38 | Washer | Carbon steel |
Spare Parts and Ordering
Spare parts are interchangeable between spring-extend and spring-retract variants.
| Spare Part Kit | Included Item Numbers |
|---|---|
| Stem seal kit | 3, 4, 5 |
| Diaphragm kit | 9, 30 |
| Travel indicator kit | 23, 28, 29 |
| Spring kit | 11 |
| Linkage | 19, 20, 21, 22, 25, 26 |
| Handwheel | Complete handwheel assembly |
When ordering replacement parts, specify the exact kit description from the table above alongside the full actuator model name (e.g., 1 off Spring kit for a PN9483E pneumatic piston actuator).