Expanders
Pressure Expanders
Pressure, flow control, cooling tower, industrial and precision expanders for process systems.
Range overview
Specification and supply scope
Pressure expanders provide controlled volume and flow regulation in process, utility and cooling systems. The range covers bladder and diaphragm pressure expanders, flow control devices, cooling tower expanders and precision units for low-flow analytical duty. Units are selected by volume, pressure, connection and media compatibility.
- Product types
- 5
- Documents
- 7
- Supply mode
- Made to order
Stock on request
Selection note: ASME Section VIII, PED 2014/68/EU, CRN available. Final dimensions and materials are confirmed on the order acknowledgement and, where required, the certified drawing.
Type 01 · ASME Section VIII
Pressure Expander
Bladder or diaphragm vessel for pressure stabilization and water hammer control.
Typical applications
- Closed-loop heating
- Cooling systems
- Process pressure control
- Water hammer control
Pressure expanders use a bladder or diaphragm to separate system fluid from a compressed gas charge. They absorb pressure surges, accommodate thermal expansion and maintain system pressure in closed-loop heating, cooling and process systems.
- Bladder or diaphragm construction
- Replaceable bladder on larger sizes
- System pressure stabilization
- Water hammer absorption
- Standards
- ASME Section VIII · PED 2014/68/EU · CRN available
- Materials
- Cast iron · Carbon steel · Butyl / EPDM bladder
Specification
| Volume range | 5–500 L |
|---|---|
| Pressure range | 1–350 bar |
| Temperature | -20 to 120 °C |
| Bladder | Butyl or EPDM |
| Connection | 1/2–4 in |
| Design code | ASME VIII, PED |
Ordering range
| Volume | Pressure | Connection | Material | Part number |
|---|---|---|---|---|
| 10 L | 10 bar | 1" | Cast iron | BGI-PE-010-10-CI |
| 25 L | 10 bar | 1" | Cast iron | BGI-PE-025-10-CI |
| 50 L | 16 bar | 1-1/2" | Carbon steel | BGI-PE-050-16-CS |
| 100 L | 16 bar | 2" | Carbon steel | BGI-PE-100-16-CS |
| 250 L | 25 bar | 3" | Carbon steel | BGI-PE-250-25-CS |
Type 02 · ISO 9001 manufacturing
Flow Control Expander
Compact device for stable low-flow regulation in process systems.
Typical applications
- Analytical systems
- Dosing and metering
- Utility regulation
- Pilot systems
Flow control expanders provide stable regulation at low flow rates using a spring-loaded or diaphragm mechanism. They are used in analytical, dosing and utility systems where a conventional control valve would be oversized.
- Stable low-flow regulation
- Compact inline or panel-mount body
- Brass and stainless steel options
- Low dead volume
- Standards
- ISO 9001 manufacturing · PED 2014/68/EU · Manufacturer standard
- Materials
- Brass · 316L stainless steel
Specification
| Flow range | 0.1–100 L/min |
|---|---|
| Pressure range | 1–50 bar |
| Connection | 1/8–1 in NPT/BSP |
| Body | Brass or 316L |
| Turndown | 20:1 typical |
| Design code | PED |
Ordering range
| Series | Flow range | Pressure | Material | Part number |
|---|---|---|---|---|
| FCE-Micro | 0.1–2 L/min | 1–20 bar | Brass | BGI-FCE-MICRO-BR |
| FCE-Standard | 1–20 L/min | 1–35 bar | Brass | BGI-FCE-STD-BR |
| FCE-Standard | 1–20 L/min | 1–50 bar | 316L | BGI-FCE-STD-316 |
| FCE-Industrial | 10–100 L/min | 1–50 bar | 316L | BGI-FCE-IND-316 |
Type 03 · ASME Section VIII
Cooling Tower Expander
Large-volume expander for cooling tower and condenser water systems.
Typical applications
- Cooling towers
- Condenser water loops
- HVAC plants
- Industrial cooling
Cooling tower expanders accommodate the large water-volume changes in open and closed cooling systems. They are sized for the system volume, static head and temperature swing, with corrosion-resistant linings and connections for tower and condenser loops.
- Large-volume pressure stabilization
- Corrosion-resistant lining options
- Sized for cooling tower loops
- Vertical or horizontal installation
- Standards
- ASME Section VIII · PED 2014/68/EU · Manufacturer standard
- Materials
- Ductile iron · Carbon steel · Stainless steel
Specification
| Volume range | 100–1,000 L |
|---|---|
| Pressure range | 2–30 bar |
| Temperature | 0–80 °C |
| Connection | 2–6 in |
| Body | Ductile iron, carbon steel, stainless |
| Design code | ASME VIII, PED |
Ordering range
| Volume | Pressure | Connection | Material | Part number |
|---|---|---|---|---|
| 200 L | 10 bar | 2" | Ductile iron | BGI-CTE-200-10-DI |
| 500 L | 10 bar | 3" | Ductile iron | BGI-CTE-500-10-DI |
| 750 L | 16 bar | 4" | Stainless steel | BGI-CTE-750-16-SS |
| 1000 L | 16 bar | 4" | Stainless steel | BGI-CTE-1000-16-SS |
Type 04 · ASME Section VIII
Industrial Expander
Heavy-duty expander for process, utility and industrial water systems.
Typical applications
- Process water
- Industrial utilities
- Pump systems
- Pressure stabilization
Industrial expanders are heavy-duty pressure vessels for process and utility systems. They are supplied with flanged or threaded connections, protective linings and optional instrumentation tappings for pressure monitoring.
- Heavy-duty industrial construction
- Flanged or threaded connections
- Protective lining options
- Instrumentation tappings available
- Standards
- ASME Section VIII · PED 2014/68/EU · CRN available
- Materials
- Ductile iron · Cast steel · Carbon steel
Specification
| Volume range | 5–500 L |
|---|---|
| Pressure range | 1–200 bar |
| Temperature | -10 to 100 °C |
| Connection | 1–6 in |
| Body | Ductile iron, cast steel |
| Design code | ASME VIII, PED |
Ordering range
| Volume | Pressure | Connection | Material | Part number |
|---|---|---|---|---|
| 10 L | 10 bar | 1" | Ductile iron | BGI-IE-010-10-DI |
| 50 L | 16 bar | 2" | Cast steel | BGI-IE-050-16-CS |
| 100 L | 25 bar | 2" | Cast steel | BGI-IE-100-25-CS |
| 250 L | 25 bar | 3" | Cast steel | BGI-IE-250-25-CS |
| 500 L | 40 bar | 4" | Cast steel | BGI-IE-500-40-CS |
Type 05 · ISO 9001 manufacturing
Precision Expander
Low-volume precision unit for analytical and micro-flow systems.
Typical applications
- Analytical instruments
- Medical devices
- Micro-flow systems
- Laboratory pilot plants
Precision expanders are compact, low-volume devices for analytical, medical and micro-flow systems. They provide stable pressure and flow with minimal dead volume, and are available in 316L and titanium with precision-machined internals.
- Low dead volume
- Precision-machined internals
- 316L and titanium construction
- Stable micro-flow regulation
- Standards
- ISO 9001 manufacturing · PED 2014/68/EU · Manufacturer standard
- Materials
- 316L stainless steel · Titanium
Specification
| Flow range | 0.05–50 L/min |
|---|---|
| Pressure range | 0.5–100 bar |
| Accuracy | ±1% of set point |
| Connection | 1/8–1/2 in |
| Body | 316L, titanium |
| Design code | PED |
Ordering range
| Series | Flow range | Pressure | Material | Part number |
|---|---|---|---|---|
| PE-Micro | 0.05–1 L/min | 0.5–50 bar | 316L | BGI-PRE-MICRO-316 |
| PE-Standard | 1–10 L/min | 0.5–100 bar | 316L | BGI-PRE-STD-316 |
| PE-Large | 10–50 L/min | 0.5–100 bar | 316L | BGI-PRE-LARGE-316 |
| PE-Standard | 1–10 L/min | 0.5–100 bar | Titanium | BGI-PRE-STD-TI |
Documentation
Range documents
Datasheets, overviews and general arrangement drawings for this range. Controlled copies are issued with each order.
| Document | Type | Scope | Revision | Date | Action |
|---|---|---|---|---|---|
| Pressure Expanders — Product Overview4 pages · PDF | Product overview | Expanders · Pressure Expanders | Rev. 04 | 15 Sept 2026 | Download |
| Pressure Expanders — General Arrangement Drawing1 page · PDF | Drawing | Expanders · Pressure Expanders | Rev. 03 | 15 Sept 2026 | Download |
| Pressure Expander Datasheet2 pages · PDF | Datasheet | Expanders · Pressure Expanders · Pressure Expander | Rev. 04 | 15 Sept 2026 | Download |
| Flow Control Expander Datasheet2 pages · PDF | Datasheet | Expanders · Pressure Expanders · Flow Control Expander | Rev. 04 | 15 Sept 2026 | Download |
| Cooling Tower Expander Datasheet2 pages · PDF | Datasheet | Expanders · Pressure Expanders · Cooling Tower Expander | Rev. 04 | 15 Sept 2026 | Download |
| Industrial Expander Datasheet2 pages · PDF | Datasheet | Expanders · Pressure Expanders · Industrial Expander | Rev. 04 | 15 Sept 2026 | Download |
| Precision Expander Datasheet2 pages · PDF | Datasheet | Expanders · Pressure Expanders · Precision Expander | Rev. 04 | 15 Sept 2026 | Download |
Verification
Documented at every release
Material, dimensional and pressure records are matched to the order before shipment. Certificates and test reports are available on request.
Quality and verificationMaterial traceability
Heat-number matched mill certificates and EN 10204 3.1 on request.
Dimensional inspection
Bore, face, bolt circle and envelope checked to drawing.
Pressure testing
Hydrostatic or pneumatic testing to the order specification.
Documented release
Inspection record, packing list and certificate package.
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