Where vertical space is limited or for underground installations, our Non-rising stem (NRS) gate valve is the optimal choice. Unlike rising stem designs, the stem of this valve rotates without moving up or down, while the gate travels along the internal threads. This ensures that the overall height remains constant, making the Non-rising stem (NRS) gate valve perfect for cramped utility tunnels, ship hulls, or buried water mains. We use high-strength aluminum bronze or brass for the stem nuts and chrome-plated stems to prevent seizing and ensure smooth operation over a long service life. The full-bore design ensures zero obstructions, preventing debris accumulation in municipal wastewater applications.
As a legacy valve manufacturer since 1992, we have optimized the Non-rising stem (NRS) gate valve for harsh environments where dirt and silt are common. We've added specialized dust rings and self-cleaning thread structures to prevent jamming-a common failure point in cheaper alternatives. In our 16,600sqm facility, our R&D team uses CAD/CAE software to perform finite element analysis, ensuring that even our large-diameter Non-rising stem (NRS) gate valve units maintain structural rigidity under high-pressure surges. We are a trusted supplier for many municipal water bureaus and we bring that same level of field-proven reliability to every export order.
Technical Specifications
Design Standard: DIN 3352 / BS 5163 / AWWA C509
Body Material: Ductile Iron (GGG40/50), Cast Steel
Seat Material: EPDM Resilient Seat or Brass
Pressure Rating: PN10, PN16, PN25
Operation: Handwheel, Cap Top, Gear Box
Application Areas
Mainly used in urban water supply and drainage, firefighting networks, irrigation systems, and shipboard plumbing where space is at a premium.
Factory Customization & OEM
We offer non-standard customization for the Non-rising stem (NRS) gate valve, including special coating thicknesses (Epoxy 250μm+) and position indicators. We accept third-party inspections from SGS or BV to guarantee quality.
Quality Control & Packaging
100% of our Non-rising stem (NRS) gate valve production is tested for shell and seat tightness. Packaging is done in sturdy plywood cases with flange protectors to prevent damage during transit.
FAQ
Q: How do I know if the valve is open?
A: While the stem doesn't rise, we can provide an optional opening indicator at the top of the Non-rising stem (NRS) gate valve to show the gate position.
Q: Can these be buried directly?
A: Yes, with our high-quality epoxy coating and optional extension spindles, they are ideal for direct burial.
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