Concealed Rod Elastic Seat Sealing Valve
The concealed stem elastic seat gate valve is designed for reliable shut-off in fire protection and water supply systems. Compared with OS&Y gate valves, the stem is located inside the valve body, making it suitable for underground installation and limited space environments. The resilient seat design ensures tight sealing performance even under low pressure conditions.
This valve is widely used in fire pipeline networks, municipal water systems, and commercial building projects where durability and low maintenance are required.
As a professional manufacturer, KOXY supplies durable gate valves with stable sealing performance, ensuring long-term operation in demanding fire pipeline networks and municipal water systems.
What is a Concealed Stem Gate Valve?
A concealed stem gate valve is a type of gate valve where the stem is not visible outside the valve body. The opening and closing movement happens internally, which protects the stem from external damage and corrosion.
It is commonly used in underground pipelines and fire protection systems where space is limited and external stem movement is not required.
KOXY provides concealed stem gate valves for projects where underground installation and long service life are required.
Working Principle
The valve operates by rotating the handwheel, which drives the internal stem to move the gate up or down.
When the gate is fully lowered, the elastic seat forms a tight seal to stop fluid flow.
When lifted, the passage is fully open, allowing minimal flow resistance.
Product Features
Flats valve seat: the bottom part adopts the same flats valve seat design as the water pipe, which does not accumulate dirt and makes the sealing more reliable.
Overall rubber coating: the gate plate adopts integral rubber coating, which has good coverage performance and precise dimensions to ensure reliable sealing and longevity.
Lightweight: the valve plate is made of iron, which is lightweight and easy to install and repair.
The overall rubber ring seal: the valve stem is sealed with a "o" ring. it has been changed from the previous three "o" type seals to a single overall rubber ring. it is equipped with a copper nut to press it tightly, which is convenient and fast. the tightness is adjustable and the rubber ring is easy to replace.
Corrosion resistance: the inner cavity is coated with non-toxic epoxy resin to prevent corrosion and rust, not only can be used for drinking, but also for sewage systems.
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Technical Specifications
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 | Hand wheel | QT450 |
| 7 | Pressure cover | QT450 |
| 8 | T-nut | Qt450, copper |
| 9 | Stop push pad | A3, copper |
| 10 | Fasteners | Standard parts |
Product Dimensions
| Nominal diameter(dn) | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 600 | |||
| Medium | Valve length(mm) | 178 | 190 | 203 | 229 | 254 | 267 | 292 | 330 | 356 | 381 | 406 | 432 | 457 | 508 | ||
| Valve height(mm) | 275 | 290 | 335 | 375 | 445 | 500 | 675 | 775 | 875 | ||||||||
| Heavy duty | Valve length(mm) | 178 | 190 | 203 | 229 | 254 | 267 | 292 | 330 | 356 | 381 | 406 | 432 | 457 | 508 | ||
| Valve height(mm) | 300 | 335 | 367 | 415 | 500 | 555 | 680 | 835 | 950 | 1060 | 1170 | 1280 | 1390 | 1500 | |||
| Test pressure (mpa) | Shell | 1.5-2.4 | |||||||||||||||
| Sealed | 1.1-1.76 | ||||||||||||||||
| Nominal pressure(mpa) | 1.1-1.6 | ||||||||||||||||
| Applicable temperature | 0-80℃ | ||||||||||||||||
| Applicable medium | Water and weakly corrosive fluids | ||||||||||||||||
Standards and Certifications
Our valves are manufactured in accordance with international standards and can be supplied with certifications such as ISO, CE, and other project-specific approvals upon request.
Why Choose Our Valve Solutions
Over 20 years of manufacturing experience in pipe fittings and valves
Stable supply for large-scale fire protection projects
Strict quality control and material inspection
OEM and customization available
Fast response and international shipping support
FAQ
Q:What is the difference between concealed stem and OS&Y gate valve?
A: The main difference is the stem position. Concealed stem valves have an internal stem, while OS&Y valves have an external visible stem.
Q:Where is a concealed stem gate valve used?
A: It is mainly used in underground pipelines and fire protection systems where space is limited.
Q:Is this valve suitable for fire protection systems?
A: Yes, it is commonly used in fire water supply networks due to its reliable sealing performance.
Q:Can you provide customized specifications?
A: Yes, we support OEM production based on project requirements.
