SPIRAX SARCO · CONTROL VALVES
Spirax Sarco 2/2 Way Pneumatic Control Valve with Multi Spring Diaphragm Actuator
Spirax Sarco 5112A/B pneumatic control valve with multi spring diaphragm actuator. 2/2 way, SS/WCB body, 15-150mm sizes. Get quote from PC Engineering
Overview
The Spirax Sarco 5112A/B series is a 2/2 way pneumatic control valve equipped with a multi spring diaphragm actuator, designed for precise flow control in industrial process applications. These valves are available in both metal seated (5112A) and soft seated (5112B) configurations to suit varying process requirements.
Constructed with investment cast bodies in carbon steel (WCB) or stainless steel (CF8/CF8M), these control valves deliver reliable performance across a wide range of operating conditions. The multi spring diaphragm actuator provides consistent actuation force and improved response characteristics compared to single spring designs.
The 5112 series covers valve sizes from 15mm to 150mm (½" to 6"), with Kv values ranging from 0.1 to 400, making them suitable for both low-flow precision applications and high-capacity process control requirements.
Key Features
- 2/2 way pneumatic operation with multi spring diaphragm actuator
- Available in metal seated (5112A) or soft seated (5112B) versions
- Investment cast body construction for dimensional accuracy
- Multiple body materials: ASTM A216 Gr. WCB, ASTM A351 CF8, CF8M
- Graphited PTFE gland packing for reliable stem sealing
- PTFE lined and coated internals for corrosion resistance
- Wide Kv range (0.1 to 400) for diverse flow applications
- Actuator sizes from 250 to 800 for varying thrust requirements
Specifications
| Parameter | Value | ||||
|---|---|---|---|---|---|
| Valve Type | 2/2 Way Pneumatic Control Valve | ||||
| Valve Sizes | 15mm to 150mm (½" to 6") | ||||
| Port Sizes | 5mm to 80mm | ||||
| Kv Range | 0.1 to 400 | ||||
| Body Material | ASTM A216 Gr. WCB / ASTM A351 CF8 / CF8M | ||||
| Bonnet/Cage Material | SS 420 / AISI 316 | ||||
| Gasket | Cr-Ni Foil coated with graphite | ||||
| Gland Packing | Graphited PTFE | ||||
| Fasteners | ASTM A193 Gr. B7 / Gr. 2H | ||||
| Actuator Type | Multi Spring Pneumatic Diaphragm | ||||
| Actuator Sizes | 250, 400, 800 | ||||
| Model | Size (mm) | Size (inch) | Actuator | Face-to-Face (mm) | Weight (kg) |
| 5112A/B155 | 15 | ½ | 250 | 130 | 15.5 |
| 5112A/B205 | 20 | ¾ | 250 | 150 | 16.5 |
| 5112A/B255 | 25 | 1 | 250 | 160 | — |
| 5112A/B405 | 40 | 1½ | 250/400 | 200 | 18.0/25.0 |
| 5112A/B505 | 50 | 2 | 400 | 230 | 30.0 |
| 5112A/B655 | 65 | 2½ | 400 | 290 | 38.0 |
| 5112A/B805 | 80 | 3 | 800 | 310 | 80.0 |
| 5112A/B1005 | 100 | 4 | 800 | 350 | 90.0 |
| 5112A/B1505 | 150 | 6 | 800 | 480 | 117.0 |
Applications
The Spirax Sarco 5112A/B pneumatic control valves are widely used in:
- Steam systems – pressure and flow control in steam distribution networks - Process industries – chemical, pharmaceutical, and food processing plants - HVAC systems – heating and cooling fluid regulation - Power plants – boiler feedwater and condensate control - Oil & gas – process fluid control in refineries and petrochemical facilities - Textile and paper mills – steam and hot water control for process heating
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Get a Quote
Contact PC Engineering for pricing, availability, and technical support for Spirax Sarco 5112A/B Pneumatic Control Valves. Call us or fill in our inquiry form — our engineers will respond within 24 hours.
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