EXPANSION JOINTS · INDUSTRIAL VALVES · RUBBER COMPONENTS
Expansion joints and valves for fluid transfer systems.
We design and manufacture rubber and PTFE expansion joints as well as shut-off valves. Every solution is selected for the medium, pressure, temperature and installation conditions. Technical quotation within 24 hours.
// TRUSTED BY
We supply the largest industrial plants in Poland
Our expansion joints and valves operate in power generation, petrochemicals, mining and water management — wherever installation reliability is critical.
// Selected industrial customers. Full references with project details are available on request.
// WHO WE ARE
Engineering craftsmanship since 1971
A component that does not meet our standards never leaves the factory.
For more than half a century, we have designed and manufactured expansion joints and valves at a single facility in Zielona Góra. We are not a reseller — we are a manufacturer, where every order starts with an engineer, not a catalogue.
Before production begins, we establish the medium, pressure, temperature and installation arrangement. The compound and design are selected for actual operating conditions, while non-standard solutions are validated using FEA/CAE calculations. When an off-the-shelf solution is not enough, we engineer one to order.
This approach led to our proprietary SEKK system — an expansion joint that warns of wear before failure. Have an unusual installation problem? Those are exactly the challenges we are keen to discuss.
// HOW WE WORK
How we manufacture an expansion joint
Service life depends on how a product is built, not its catalogue price. Every product follows the same path — from engineering to pressure testing.
● Anything that fails to meet our standards is not dispatched — we manufacture in Zielona Góra with full process control.
// PRODUCT RANGE
Six product groups from one factory
Every product is selected for the installation parameters. Non-standard designs and prototypes are engineered to order and validated using FEA/CAE calculations.
Rubber expansion joints
Accommodate thermal expansion, vibration and pipeline movement.
- Diameters DN32–DN3000
- Pressure PN6–PN25
- Temp. up to 130 °C
- Material EPDM / NBR / IIR
PTFE expansion joints
Full chemical resistance for aggressive media and high temperatures.
- Diameters DN25–DN600
- Pressure PN6–PN16
- Temp. up to 260 °C
- Material PTFE
Pinch valves and sleeves
Control and isolation of abrasive media with a replaceable rubber sleeve.
- Diameters DN15–DN300
- Sleeve NR / EPDM / NBR
- Medium abrasive
Knife gate valves
Reliable isolation of contaminated media, sludge and abrasive slurries.
- Diameters DN50–DN1000
- Pressure PN10
- Medium contaminated
Rubber elbows and bends
Reduce wear and noise at pipeline direction changes.
- Diameters DN50–DN800
- Configuration made to order
Reinforced hoses
Flexible suction and discharge connections supplied with reinforcement and couplings.
- Diameters DN25–DN400
- Typ suction-discharge
Cannot find the right product? We design and manufacture custom solutions.
An expansion joint that warns before failure.
SEKK — System Elektronicznej Kontroli Kompensatora. It monitors wear of the inner layer and signals a risk before a costly system failure occurs.
Early warning
An alarm before the bellows loses tightness.
System protection
Protects pumps and connected equipment.
Flexible installation
Mounted at the flange or remotely in the control room.
// MATERIAL SELECTION
Select the right material for the medium
A starting point for selection. The final configuration is confirmed by our engineering team after reviewing all installation parameters.
| Medium | Recommended material | Max. temp. | Product type | Akcja |
|---|---|---|---|---|
| Water, wastewater | EPDM | 100 °C | Rubber expansion joint | Enquire |
| Oils, fuels | NBR | 90 °C | Rubber expansion joint | Enquire |
| Steam, hot water | IIR / EPDM | 130 °C | Rubber expansion joint | Enquire |
| Acids, alkalis, chemicals | PTFE | 260 °C | PTFE expansion joint | Enquire |
| Abrasive media, pulps | NR (sleeve) | 80 °C | Valve / knife gate valve | Enquire |
// Indicative table. The complete material selection chart is available in the Downloads section.
// KEY FIGURES
METAL-GUM in numbers
// WHY METAL-GUM
An engineering partner, not just a supplier
Support at every stage — from selection and production in Poland to on-site after-sales service.
// PROCESS
From enquiry to quotation within 24 hours
Provide the parameters
Product, diameter, pressure, temperature and medium — or simply describe the problem.
Engineering selection
Our engineering team selects the configuration and prepares a quotation.
Quotation and production
Once approved, we manufacture in Poland under full quality control.
// PROJECTS
Installations across Polish industry
Selected projects by industry and scope. A full reference list with project details is available on request.
Cooling water system
Rubber expansion joints on cooling water pipelines at a power unit.
Sludge management
Pinch valves and expansion joints for sewage sludge at a wastewater treatment plant.
Acid system
PTFE expansion joints in a high-temperature, aggressive-media line.
A full reference list with project details is available on request.
// DOWNLOADS
Documentation and datasheets
Download catalogues, operating manuals and declarations of conformity. Drawings and CAD models are supplied individually on request.
DECLARATIONS AND CERTIFICATES
Could not find a document or model for a specific size?
// SERVICE
Failures will not wait.
Neither will we.
A team of experienced engineers and technicians providing warranty service, after-sales support and a fast on-site response.
// QUALITY
Certificates and standards
PN-EN ISO 9001:2015
Quality management system
Directive 2014/68/EU
Pressure equipment, Module H
FEA / CAE calculations
Design validation
5 utility models
Patented solutions
A proven business partner
A manufacturer with a 55-year track record. Complete company details are available for verification before cooperation.
Company details
// Indicative data to be updated with current registration details.
Factory and office
2 Naftowa Street, 65-705 Zielona Góra, Poland