OS&Y Gate Valve
Size: DN50-DN300 (2''-12'')
Standards: BS5163 / DIN3352 / EN1074 / AWWA C509 / MSS SP-70
Flange Standards: EN1092-2 / ANSI B16.1 / ANSI B16.5 / DIN PN10 / PN16
Work Pressures: PN10 / PN16 / 1.0MPa / 1.6MPa / 150PSI
Product Overview
KOXY Open Rod Resilient Seated Gate Valve, also known as an OS&Y (Outside Screw and Yoke) Gate Valve or Rising Stem Gate Valve, is designed for reliable shut-off in fire protection, water supply, industrial and municipal pipeline systems.
The external stem design provides a clear visual indication of valve position during operation, while the resilient rubber-coated wedge ensures tight sealing and low leakage performance. Compared with conventional metal seated gate valves, resilient seated gate valves offer better sealing reliability, corrosion resistance and lower maintenance requirements.
This valve is widely used in fire protection pipelines, water transmission systems, HVAC, municipal waterworks and industrial fluid control applications where dependable on/off isolation is required.
Product Features
Reliable Bubble-Tight Sealing
The rubber encapsulated wedge provides elastic deformation compensation and ensures excellent sealing performance, helping reduce leakage risk compared with traditional gate valves.
Visual Open / Close Position Indication
The rising stem (open rod) design moves visibly during operation, allowing operators to quickly confirm valve status and improving safety in fire protection and industrial systems.
Corrosion-Resistant Construction
Ductile iron body with epoxy coating protects against rust and extends service life in water supply and outdoor pipeline environments.
Low Torque Operation
Optimized stem and wedge design reduces opening and closing torque, improving operational efficiency and maintenance convenience.
Why Choose an OS&Y Gate Valve?
An OS&Y gate valve (Outside Screw and Yoke gate valve) is preferred in applications where valve position must be visually confirmed.
Compared with non-rising stem gate valves:
Stem position is clearly visible
Easier maintenance and inspection
Better suited for fire protection systems
Reduced hidden stem corrosion risk
This makes OS&Y resilient seated gate valves a popular choice for:
Fire sprinkler systems
Municipal water supply
Pump rooms
Industrial water lines
HVAC systems
Commercial buildings
Advantages of KOXY Resilient Seated Gate Valve
Bubble-tight sealing performance
Clear valve position indication
Corrosion-resistant epoxy coating
Durable ductile iron body
Low operating torque
Long service life
Suitable for fire protection applications
Multiple flange standards available
OEM / custom branding support
Request a Quote
Looking for a reliable OS&Y resilient seated gate valve manufacturer or supplier?
KOXY provides:
Complete size range
OEM customization
International standards
Fast delivery
Project and distributor support
Contact us today for pricing, technical data or a quotation.
Technical Specifications
| Item | Specification |
|---|---|
| Product Type | Open Rod Resilient Seated Gate Valve |
| Valve Type | OS&Y / Rising Stem Gate Valve |
| Body Material | Ductile Iron |
| Wedge Material | EPDM / Rubber Encapsulated |
| Stem Material | Stainless Steel |
| Size Range | DN50-DN300 (2''-12'') |
| Pressure Rating | PN10 / PN16 |
| End Connection | Flanged |
| Flange Standards | EN1092-2 / ANSI B16.1 / ANSI B16.5 |
| Coating | Fusion Bonded Epoxy (FBE) |
| Working Temperature | 0°C to 80°C |
| Applicable Medium | Water / Fire Protection Water / Weakly Corrosive Fluids |
Product Components Materials
| Serial number | Main part | Material | ||||
| 1 | Valve body | QT450 | ||||
| 2 | Gate | Qt450,nitrile rubber | ||||
| 3 | Stem | 304,2cr13,copper | ||||
| 4 | Valve cover | QT450 | ||||
| 5 | Sealing ring | Nitrile rubber | ||||
| 6 | Stem nut | Qt450,copper | ||||
| 7 | Hand wheel | QT450 | ||||
| 8 | Bracket | QT450 | ||||
| 9 | T-nut | Qt450,copper | ||||
| 10 | Pressure cover | QT450 | ||||
| 10 | Fasteners | Standard parts | ||||
Product Dimensions
| Specifications(dn) | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | ||||
| Medium | Valve length (mm) | 178 | 190 | 203 | 229 | 254 | 267 | 292 | 330 | 356 | |||
| Valve fully closed height (mm) | 320 | 350 | 390 | 430 | 600 | 620 | 770 | 980 | 1110 | ||||
| Valve full opening height (mm) | 400 | 430 | 500 | 550 | 700 | 800 | 1000 | 1180 | 1390 | ||||
| Heavy duty | Valve length(mm) | 178 | 190 | 203 | 229 | 254 | 267 | 292 | 330 | 356 | |||
| Valve fully closed height (mm) | 355 | 390 | 450 | 490 | 630 | 655 | 815 | 1000 | 1155 | ||||
| Valve full opening height (mm) | 430 | 490 | 550 | 600 | 750 | 830 | 1050 | 1270 | 1500 | ||||
| Test pressure (mpa) | Shell | 1.5-2.4 | |||||||||||
| Sealed | 1.1-1.76 | ||||||||||||
| Nominal pressure(mpa) | 1.0-1.6 | ||||||||||||
| Applicable temperature | 0-80℃ | ||||||||||||
| Applicable medium | Water and weakly corrosive fluids | ||||||||||||
FAQ
Q: What is an OS&Y gate valve?
A: OS&Y stands for Outside Screw and Yoke. It is a rising stem gate valve where the stem moves upward when the valve opens, providing a clear visual indication of valve position.
Q: What is the difference between OS&Y and non-rising stem gate valves?
A:OS&Y gate valves have an external rising stem for visible operation status, while non-rising stem valves keep the stem inside the valve body and are more compact.
Q: Why choose a resilient seated gate valve?
A: Resilient seated gate valves provide:
Better sealing performance
Lower leakage risk
Reduced maintenance
Improved corrosion resistance
Longer service life compared with metal seated valves
Q: Is this valve suitable for fire protection systems?
A: Yes. OS&Y resilient seated gate valves are widely used in fire sprinkler and hydrant systems because they allow quick visual confirmation of valve status.
