Flanged Gate Valves
Resilient seated gate valves are non-rising stem, flanged isolating valves used to fully open or fully close potable water and non-aggressive fluid lines. Because the wedge is fully encapsulated in elastomer, there is no wedge pocket in the body floor; on closing, the rubber surface seats directly on the inner body wall to seal.
Body, bonnet and handwheel are made of EN-GJS-500-7 ductile iron, with inner and outer surfaces coated in RAL 5005 blue epoxy powder. The valves are designed to EN 1074-1/2 and EN 1171, made from DN40 to DN600 with PN10 and PN16 flanges, and operate between 0 and +80 °C. The stem seal O-rings can be renewed with the line under pressure, in line with ISO 7259.
Main Applications
- Municipal potable water distribution networks
- Main water entries of buildings and estates
- Booster set and pump group manifolds
- Agricultural irrigation mains
- Industrial cooling and service water lines
Technical Data
| Wedge | Ductile iron, fully EPDM encapsulated |
|---|---|
| Stem | Non-rising, closes clockwise |
| Nominal pressure | PN10 / PN16 |
| Size | DN40 … DN600 |
| Temperature | 0 … +80 °C |
| Media | Potable water and non-aggressive fluids |
| Design | EN 1074-1 and -2, EN 1171 |
| Flange drilling | EN 1092-2, PN10 / PN16 |
| Length | EN 558 / ISO 5752 basic series 14; 140 mm at DN40 |
| Hydrostatic test | EN 12266-1; shell 15 / 24 bar, seat 11 / 17.6 bar (PN10 / PN16) |
| Stem seal | O-rings renewable under pressure to ISO 7259 |
| Options | Extension spindle, ISO 5210 B3 top flange, electric actuator |
Material Options
| Part | PN10 · ductile iron | PN16 · ductile iron |
|---|---|---|
| Body and bonnet | EN-GJS-500-7 (EN-JS1050) | EN-GJS-500-7 (EN-JS1050) |
| Wedge | Ductile iron, EPDM encapsulated | Ductile iron, EPDM encapsulated |
| Wedge nut and stuffing nut | Brass CW602N | Brass CW602N |
| Stem | Stainless 1.4021 (X20Cr13) | Stainless 1.4021 (X20Cr13) |
| Bonnet gasket and O-rings | EPDM | EPDM |
| Dust guard | NBR | NBR |
| Bonnet bolts | Stainless A2-70 | Stainless A2-70 |
| Shell / seat test pressure | 15 / 11 bar | 24 / 17.6 bar |
Application note: These valves are designed to operate fully open or fully closed and should not be used to regulate flow. At pump outlets, a rubber expansion joint can be added to keep vibration away from the valve flanges.
Advantages
No Wedge Pocket
- No wedge pocket in the body floor.
- No sediment build-up, bore kept clear.
Three O-ring Stem
- The third O-ring adds assurance.
- O-rings renewed with the line pressurised.
Light Operation
- Rolled double-lead driving thread.
- Opening and closing at low torque.
Bolt-Wrapping Gasket
- The bonnet gasket wraps each bolt.
- Additional sealing at the bonnet joint.
Fit for Potable Water
- Epoxy powder inside and outside.
- Stainless bolts, brass internals.
Construction and Design Features
- Clockwise-closing non-rising stem and ductile iron handwheel
- Fully EPDM-encapsulated wedge and brass wedge nut
- Double-lead driving thread formed by rolling
- EPDM bonnet gasket wrapping each bolt
- NBR dust guard and three-O-ring stem seal
Send the size, pressure class, medium and preferred operation (handwheel, extension spindle, actuator) through the Request a Quote form; we will prepare the resilient seated gate valve to suit your needs.
How to Choose?
- Confirm the mediumMake sure it is potable water or a non-aggressive fluid below 80 °C.
- Choose the pressure classSelect PN10 or PN16 flanges according to the line working pressure.
- Determine the sizeChoose the same DN as the pipe; full bore means no size reduction is needed.
- Choose the operationFor buried or hard-to-reach points, consider an extension spindle or an actuator on an ISO 5210 flange.
- Check the installation lengthWhen replacing on an existing line, measure that the EN 558 series 14 length fits the gap.
Complementary Products
Why ORFA?
Other Gate Valves
Our Flanged Gate Valves
ORFA supplies flanged gate valves in a range of pressure classes, sizes and connection types to suit your application. Descriptions, technical specifications, materials and dimension tables are available on each detail page.
Get a quote for your project
Our sales team will prepare the best solution for your needs.