01.07.2026 19:07
A Rising Stem Gate Valve (OS&Y – Outside Screw & Yoke) is a full-port, flanged gate valve designed to completely open or shut off fluid flow. As the valve opens, the stem rises above the bonnet, providing a clear visual indication of whether the valve is open or closed. The full-port design allows unrestricted flow with minimal pressure loss.
These valves are widely used in fire protection systems, water distribution networks, HVAC systems, power plants, oil and petrochemical facilities, and industrial process pipelines. Their flanged construction provides secure installation, while the rising stem design ensures easy operational status monitoring.
Advantages
Full port design for maximum flow
Minimal pressure loss
Excellent sealing performance
Rising stem provides visible open/closed indication
Secure flanged connection
Long service life
Low maintenance requirements
Suitable for large pipelines and high-pressure applications
Applications
Fire protection systems
Potable water and water distribution networks
HVAC systems
Heating and cooling systems
Industrial facilities
Power plants
Oil and petrochemical industries
Chemical processing plants
Infrastructure projects
Working Principle
Turning the handwheel or actuator moves the stem vertically. As the stem rises, the gate opens completely, allowing unrestricted flow. Lowering the stem closes the gate tightly against the seat, completely stopping the flow.
Technical Specifications
Body: Ductile Iron (GGG50) / Carbon Steel / Stainless Steel
Wedge: EPDM/NBR-Coated Ductile Iron or Metal Wedge
Stem: Stainless Steel
Pressure Rating: PN16 / PN25
Connection: Flanged (EN 1092-2)
Standards: EN 1074-2, EN 1171, EN 558
Nominal Size: DN50 – DN600
