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Overview
The Resilient Wedge NRS (Non-Rising Stem) Gate Valve – Grooved End is designed for dependable shut-off control in fire protection and water distribution systems.
With grooved end connections and a resilient wedge sealing structure, this valve ensures fast installation, secure sealing, and reliable performance under high-pressure conditions.
The non-rising stem design makes it particularly suitable for installations where vertical space is limited, such as underground pipelines, valve pits, and confined mechanical rooms.
This gate valve features a rubber-encapsulated resilient wedge that provides tight shut-off and long-term sealing reliability.
The straight-through flow path minimizes pressure loss when the valve is fully open, ensuring efficient system performance.
Grooved end connections allow quick assembly using standard couplings, eliminating the need for welding or threading and significantly reducing installation time and labor costs.
| Size | 2''-12'' (DN 50-DN 300) | |
| Grooved OS&Y Gate Valve Main Parts and Material | Body | Ductile iron as A536, 65-45-12 |
| Bonnet | Ductile iron as A536, 65-45-12 | |
| Resilient wedge disc | Ductile iron as A536, 65-45-12 + EPDM | |
| Stem | SS304/SS304/SS420/SS431 | |
| Yoke | Ductile iron as A536, 65-45-12 | |
| Handwheel | Ductile iron as A536, 65-45-12 | |
| Flanged OS&Y Gate Valve Main Parts and Material | Body | Ductile iron as EN-GJS 450-10 |
| Bonnet | Ductile iron as EN-GJS 450-10 | |
| Resilient wedge disc | Ductile iron as EN-GJS 450-10+EPDM | |
| Stem | SS304/SS304/SS420/SS431 | |
| Yoke | Ductile iron as EN-GJS 450-10 | |
| Handwheel | Ductile iron as EN-GJS 450-10 | |
| Butterfly Valve Main Parts and Material | Body | Ductile iron as A536, 65-45-12 |
| Shaft | SS431 | |
| Disc | Ductile iron+EPDM/NBR | |
| Signal gearbox | Housing/cover: Ductile iron | |
| Worm | Carbon steel Or Ductile iron | |
| Handwheel | Ductile iron as A536, 65-45-12 | |
| Certificate | Fire valve | FM/UL |
| water valve | Wras | |
| Standard | fire valve | UL 262/AWWAC 515,EN11 71,UL 1091/MSS SP-67 |
| water valve | GB/BS5163,DIN3352 F4 DIN F5,JIS,KS 10K,AWWA C515,ANSI | |
| Connection | Grooved as AWWA C606, Flange as ASME B16.1,Flange as BS EN1092-2 | |
| Flange Standard | CLASS 150,PN10/16/25. Table D/E/F. 10K/16K/20K | |
| Temperature | 0℃-100℃ | |
| W.Pressure | 350psi | |
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Non-Rising Stem (NRS) Design
The stem remains stationary during valve operation, allowing installation in underground or space-restricted environments.
Resilient Wedge Sealing
Fully rubber-coated wedge ensures excellent sealing performance and long service life.
Dual-End Connection Design
Flanged inlet combined with grooved outlet improves installation flexibility and system compatibility.
Multiple Flange Standards Supported
Compatible with:
ASME/ANSI B16.1 Class 125
ASME/ANSI B16.42 Class 150
BS EN 1092-2 PN16
GB/T 9113.1
Grooved End Compliance
Groove dimensions conform to ANSI/AWWA C808 or metric standards.
Standardized Face-to-Face Dimensions
Face-to-face dimensions conform to ASME B16.10, enabling easy replacement and system integration.
Wide Size Range
Available in sizes from 2” to 12”, covering common fire protection and water system requirements.
High Pressure Performance
Maximum working pressure: 200 PSI
Maximum testing pressure: 400 PSI
Pressure performance conforms to FM 1120/1130, UL 262, and ULC/ORD C262-92
Wide Operating Temperature Range
Suitable for temperatures from 0°C to 80°C (32°F to 176°F).
Corrosion-Resistant Coating
Internal and external epoxy coating provides excellent corrosion protection. Additional coating options are available upon request.
Maintenance-Friendly Design
Equipped with an NPT plug on the valve body and two operating nuts for ease of operation and inspection.
Lead-Free Option Available
Certified lead-free design compliant with NSF/ANSI 61 and NSF/ANSI 372, suitable for potable water applications.
Fire protection systems (sprinkler and water-based fire fighting pipelines)
Municipal water supply and distribution systems
Underground and buried piping installations
Commercial and industrial buildings
Pump stations and mechanical rooms
Infrastructure and utility projects
Retrofit projects combining flanged and grooved piping systems
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Faq
Q1: What is an NRS gate valve?
A: NRS stands for Non-Rising Stem. The stem does not move upward when the valve is opened, making it suitable for underground or limited-space installations.
Q2: What is the advantage of a flanged × grooved end valve?
A: This configuration allows flexible connection between flanged piping systems and grooved coupling systems, reducing installation time and system modification costs.
Q3: Is this valve suitable for fire protection systems?
A: Yes. The valve is designed to meet pressure and performance requirements commonly used in fire protection applications.
Q4: What pressure ratings does the valve support?
A: The valve supports a maximum working pressure of 200 PSI and a maximum testing pressure of 400 PSI.
Q5: Can this valve be used for potable water systems?
A: Yes. A certified lead-free version is available, compliant with NSF/ANSI 61 and NSF/ANSI 372.
Q6: What temperature range can the valve operate in?
A: The valve operates within a temperature range of 0°C to 80°C (32°F to 176°F).
Q7: What coating options are available?
A: Standard epoxy coating is provided. Alternative coating options are available upon request.
