DIN Resilient Seated NRS Gate Valve

Product Overview

The DIN Resilient Seated Non-Rising Stem (NRS) Gate Valve is a premium fluid control solution designed and manufactured to comply with German DIN standards (DIN 3352 Part 4, DIN 2501, etc.). Featuring a non-rising stem design and resilient seated sealing system, this valve delivers exceptional performance in applications where space is limited and reliable leak-tight operation is critical.

Unlike rising stem gate valves, the NRS design keeps the stem fully enclosed within the valve body, eliminating vertical stem movement during operation. This compact design makes it ideal for underground installations, confined equipment rooms, and urban pipeline networks where vertical space is restricted.

Constructed with ductile iron body and EPDM/NBR resilient seating, our DIN NRS gate valve offers superior corrosion resistance, low operating torque, and bubble-tight sealing—suitable for water, wastewater, oil, and chemical mediums across municipal, industrial, and energy sectors.

Key Features & Benefits

Space-Efficient NRS Design

Non-rising stem eliminates vertical movement, reducing installation space requirements—ideal for underground pipelines and confined spaces.

Bubble-Tight Sealing

Resilient EPDM/NBR seating provides zero-leakage performance, even with minor debris in the medium, ensuring reliable shut-off.

Corrosion Resistance

Epoxy-coated ductile iron body and stainless steel stem resist corrosion from harsh media and underground environments.

Low Operating Torque

Smooth resilient seat design reduces friction, enabling easy manual operation or compatibility with electric/pneumatic actuators.

Low Maintenance

Enclosed stem design minimizes wear and contamination; replaceable seat inserts reduce downtime and maintenance costs.

DIN Standard Compliance

Fully compliant with DIN 3352, DIN 2501, and EN standards, ensuring compatibility with European pipeline systems.

Technical Specifications

Basic Parameters

Parameter	Specification Range
Nominal Diameter (DN)	DN50 ~ DN1200 (2" ~ 48") Common Sizes: DN50, DN65, DN80, DN100, DN150, DN200, DN300
Nominal Pressure (PN)	PN10, PN16, PN25 (10bar, 16bar, 25bar)
Operating Temperature	-10°C ~ 120°C (Custom high/low temp options available)
Applicable Media	Water, Wastewater, Oil, Chemicals, Acid/Alkali Solutions, Saltwater
Sealing Class	ANSI Class VI (Bubble-tight), EN 12266-1

Material Specifications

Component	Material Options	Standards/Features
Valve Body	Ductile Iron, Cast Iron	BS 2789 Gr.500/7 (Ductile Iron), BS 1452 Gr.220/250 (Cast Iron)
Disc	Ductile Iron + Resilient Coating	EPDM (Temperature-resistant), NBR (Oil-resistant)
Stem	Stainless Steel, Brass	DIN X20Cr13, SS 416 (Stainless Steel); CuZn39Pb3 (Brass)
Seals (Seat/O-Ring)	EPDM, NBR	Aging/chemical resistant, medium-specific customization
Fasteners	Brass, Stainless Steel A2-70	BS 2874 CZ132 (Brass), Corrosion-resistant

Standards & Compliance

Design Standards: DIN 3352 Part 4, DIN 3202 F4/F5, MSS SP-70, AWWA C509/C515, BS 5163
Flange Standards: DIN 2501, DIN 2533, EN 593
Testing Standards: DIN 3230, BS 6755, API 598, GB 13927 (Hydrostatic, Shell, Leakage Testing)
Certifications: ISO 9001, CE, WRAS (Drinking Water), ACS

Working Principle

The DIN Resilient Seated NRS Gate Valve controls fluid flow through the interaction between a resilient-coated disc and elastomeric seat, with a fully enclosed non-rising stem mechanism:

Opening Process: Rotating the handwheel or activating the actuator drives the stem to rotate around its axis. The stem's threaded connection moves the stem nut vertically, lifting the disc away from the resilient seat to open the fluid passage. The stem remains fully enclosed (no vertical movement).
Closing Process: Reverse rotation of the handwheel/actuator lowers the disc onto the resilient seat. The elastomeric seat deforms slightly under pressure, filling micro-gaps between the disc and body to create a hermetic seal and block fluid flow.
Sealing Assurance: The deformable resilient seat absorbs minor debris in the medium, prevents disc-body impact damage, and maintains reliable sealing performance even with moderate pipeline pressure fluctuations.

Application Areas

Municipal Infrastructure

Drinking water networks, wastewater treatment plants, stormwater drainage systems (ideal for underground installation).

Industrial Sector

Petrochemical fluid transfer, metallurgical cooling water systems, food/pharmaceutical clean fluid pipelines.

Energy & Environment

Oil/gas wellhead systems, gas transmission pipelines, landfill leachate transfer, irrigation systems.

Special Applications

Shipboard pipeline systems, underground utility tunnels, equipment rooms with limited vertical space.

Installation & Maintenance

Installation Guidelines

Inspect valve for damage and confirm closed position before installation; clean pipeline connections to remove debris.
Install in any orientation (bi-directional sealing), ensure handwheel/actuator is accessible for operation and maintenance.
Tighten flange bolts evenly in a crisscross pattern to avoid uneven pressure on the sealing surface.
For underground installation, use a valve chamber to ensure drainage and prevent waterlogging/corrosion.
Conduct hydrostatic testing (1.5×PN) and leakage testing after installation before commissioning.

Maintenance Recommendations

Regularly inspect position indicator accuracy and operation smoothness (lubricate stem annually).
Check body coating for damage; repair epoxy coating promptly to prevent corrosion.
Replace resilient seat every 5-7 years (or as needed based on operating conditions).
For long-term shutdown, keep valve fully closed to prevent debris accumulation in the seat.
Use only manufacturer-recommended replacement parts to maintain performance and compliance.

Frequently Asked Questions (FAQ)

Q: What causes leakage after valve closure?

A: Common causes include worn/damaged resilient seats, disc jamming from debris, or uneven flange bolt tightening. Inspect bolt torque first; replace seat inserts if leakage persists.

Q: How to check valve position with NRS design?

A: All models include a visual position indicator (pointer/scale) for direct status verification. Electric models support remote monitoring via control systems.

Q: Can this valve handle high-temperature media?

A: Standard models operate up to 120°C. For temperatures exceeding 120°C, custom high-temperature seat materials (e.g., Viton) and body alloys are available—contact our technical team for solutions.

Q: What is the service life of the resilient seat?

A: Typical service life is 5-7 years for water applications; service life may shorten in aggressive chemical media (we recommend NBR/Viton seats for oil/chemical applications).

Need Custom Solutions?

Our engineering team can customize DIN Resilient Seated NRS Gate Valves to meet your specific pressure, temperature, and media requirements. Contact us today for a personalized quote.

Contact Our Technical Team