Overview
Gate valves are widely used as shut-off valves in fire protection, water supply, HVAC, municipal waterworks, and industrial piping systems. They are designed to fully open or fully close the pipeline flow, providing reliable isolation and low flow resistance when the valve is in the fully open position.
MaitoLead gate valves are available in different designs, including NRS gate valves, OS&Y gate valves, resilient seated gate valves, flanged gate valves, grooved gate valves, and post indicator gate valves. They can be supplied according to international standards such as EN1171, EN1092-2, ISO 7005-2, AWWA C515, AWWA C509, ASME B16.42, AWWA C606, and EN12266.
With a ductile iron body, resilient EPDM wedge, stainless steel or bronze stem options, and high-quality epoxy coating, our gate valves are suitable for reliable operation in demanding pipeline systems. FM approved and UL listed options are available for fire protection applications.
1,NRS Gate Valve
NRS means Non-Rising Stem. The stem does not move upward when the valve is opened or closed, making it suitable for installations with limited vertical space, such as underground pipelines, valve chambers, pump rooms, and compact piping systems.
Common types include:
Flanged NRS Gate Valve
Grooved NRS Gate Valve
Resilient Seated NRS Gate Valve
Post Indicator NRS Gate Valve
2. OS&Y Gate Valve
OS&Y means Outside Screw and Yoke. The stem rises when the valve is opened, allowing users to visually identify whether the valve is open or closed. OS&Y gate valves are commonly used in fire protection systems where valve position monitoring is important.
Common types include:
Flanged OS&Y Gate Valve
Grooved OS&Y Gate Valve
Resilient Seated OS&Y Gate Valve
Fire Protection OS&Y Gate Valve
3. Resilient Seated Gate Valve
Resilient seated gate valves use an EPDM-covered wedge to provide tight sealing performance. Compared with traditional metal seated gate valves, they offer better sealing, lower operating torque, and improved corrosion resistance.
Product Description
The Resilient Seated NRS Gate Valve features a simple structure, low operating torque, reliable sealing performance, and a smooth
straight-through flow channel.
Its internal and external surfaces are coated with high-quality epoxy powder for excellent corrosion resistance and long service life. The valve is suitable for water supply, fire protection, HVAC, and industrial piping systems.
| Name of parts | Material |
| Body | Ductile iron |
| Wedge | Ductile iron+EPDM |
| Stem nut | Bronze |
| Stem | SS431 or SS304,SS316,bronze |
| Bonnet | Ductile iron |
| Bonnet Gasket | EPDM |
| Sealing Ring | EPDM |
| Upper cover | Ductile iron |
| Sliding disc | Bronze |
| Screw | Carbon steel with hot galvanization |
| O-rings | EPDM |
| Handwheel | Ductile iron |
| ITEM | Specification |
| Product Name | Mechanical Joint Resilient Seated NRS Gate Valve |
| Model No. | 1112 |
| Valve Type | NRS Gate Valve / Non-Rising Stem Gate Valve |
| Design Standard | AWWA C515 |
| End Standard | AWWA C153 / A21.53 |
| Connection Type | Mechanical Joint End |
| Size Range | 3" – 12" |
| Working Pressure | 3" – 12": 362 PSI |
| Temperature Range | 0°C – 80°C |
| Body Material | Ductile Iron |
| Wedge Type | Resilient Seated Wedge |
| Seat Material | EPDM / NBR Available |
| Stem Type | Non-Rising Stem |
| Application | Fire Protection, Water Supply, Municipal Waterworks, Underground Pipeline |
| Certification | FM Approved / UL Listed |
| Testing Standard | AWWA C515 |
| Size Inch | L | H | M | D | K | D2 | D1 | n-d1 | b |
| 3" | 9.5 | 10.77 | 7 | 7.62 | 6.19 | 4.94 | 4.06 | 4-0.75 | 0.58 |
| 4" | 10 | 12.74 | 10 | 9.06 | 7.50 | 6.02 | 4.90 | 4-0.88 | 0.60 |
| 6" | 10.5 | 16.67 | 12 | 11.06 | 9.50 | 8.12 | 7.00 | 6-0.88 | 0.63 |
| 8" | 11.5 | 20.89 | 14 | 13.31 | 11.75 | 10.27 | 9.15 | 6-0.88 | 0.66 |
| 10" | 13 | 25.39 | 16 | 15.62 | 14.00 | 12.34 | 11.20 | 8-0.88 | 0.70 |
| 12" | 14 | 28.56 | 16 | 17.88 | 16.25 | 14.44 | 13.30 | 8-0.88 | 0.73 |
PRODUCTION LINE
Factory production
Faq
1. What does NRS mean?
NRS means Non-Rising Stem, which means the stem does not move upward when the valve is opened or closed. This design saves installation space.
2. What is the difference between resilient seated and metal seated gate valves?
A resilient seated gate valve uses an EPDM-covered wedge for better sealing, while a metal seated gate valve uses metal-to-metal contact.
3. What size range is available?
This valve is available in DN50 to DN300. Larger sizes may be available on request.
4. What pressure ratings are available?
The standard pressure ratings are PN16 and PN25.
5. What standards does this valve comply with?
It is manufactured according to EN1171 and the flange connection follows EN1092-2.
6. Is this valve suitable for fire protection systems?
Yes, it can be used in fire protection systems. FM approved and UL listed versions are available if required.
7. What is the body material?
The valve body is made of ductile iron.
8. What is the wedge material?
The wedge is made of ductile iron with EPDM resilient sealing.
9. What is the working temperature range?
The temperature range is 0°C to 80°C.
10. Can you provide OEM service?
Yes, OEM and customized marking/packing can be provided according to customer requirements.
11. What documents can you provide?
We can provide technical datasheet, inspection report, packing list, commercial invoice, and certificate documents according to order requirements.
12. What is the typical application of this valve?
It is widely used in water supply, fire protection, municipal pipelines, industrial systems, and HVAC systems.
