DIN Metal Seated RS Gate Valve

Product Overview

The DIN Metal Seated Rising Stem (RS) Gate Valve is a heavy-duty fluid control solution designed and manufactured to comply with German DIN standards (DIN 3352 Part 1, DIN 2501, etc.). Featuring a rising stem design and metal-to-metal seating, this valve delivers exceptional performance in applications where visual position indication, high temperatures, and abrasive media are common.

Unlike non-rising stem gate valves, the RS design extends the stem vertically during operation, providing clear visual indication of the valve's open/closed position. The metal-to-metal seating ensures reliable shut-off even in high-temperature and high-pressure environments.

Constructed with carbon steel or stainless steel body and Stellite/Hardfaced metal seating, our DIN RS gate valve offers superior erosion resistance, high-temperature tolerance, and long service life—suitable for steam, oil, gas, slurry, and other aggressive media across power generation, oil & gas, and chemical processing sectors.

Key Features & Benefits

Visual Position Indication

Rising stem design provides clear visual confirmation of open/closed status, ideal for critical applications requiring immediate position verification.

High-Temperature Capability

Metal-to-metal seating and heat-resistant materials allow operation up to 600°C, suitable for steam and high-temperature process applications.

Abrasion Resistance

Hardfaced Stellite or WC-Co seating resists wear from abrasive media such as slurry, ash, and particulate-laden fluids.

High-Pressure Rating

Designed to withstand PN40 to PN100 pressure classes, suitable for critical high-pressure applications in power and oil & gas industries.

Reliable Sealing

Precision-machined metal seating surfaces provide bubble-tight shut-off even after thousands of cycles, ensuring long-term performance.

DIN Standard Compliance

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

Technical Specifications

Basic Parameters

Parameter	Specification Range
Nominal Diameter (DN)	DN50 ~ DN1200 (2" ~ 48") Common Sizes: DN50, DN80, DN100, DN150, DN200, DN300, DN400
Nominal Pressure (PN)	PN16, PN25, PN40, PN63, PN100 (16bar to 100bar)
Operating Temperature	-20°C ~ 600°C (Custom materials for extreme temperatures)
Applicable Media	Steam, Oil, Gas, Slurry, Abrasive Fluids, High-Temperature Water, Chemicals
Sealing Class	ANSI Class IV, EN 12266-1 (Metal-to-Metal)

Material Specifications

Component	Material Options	Standards/Features
Valve Body	Ductile & Casting Iron,Carbon Steel, Stainless Steel, Alloy Steel	ASTM A216 WCB, A351 CF8/CF8M, A182 F11/F22 (High-Temperature)
Disc	Ductile & Casting Iron,Carbon Steel/Stainless Steel + Hardfacing	Stellite 6, WC-Co, Chrome Carbide (Abrasion-Resistant)
Stem	Stainless Steel, Alloy Steel	ASTM A182 F6a, F316, F51 (Duplex) - Corrosion & Heat Resistant
Seats	Stellite, WC-Co, Chrome Plated	Metal-to-Metal, Erosion & High-Temperature Resistant
Fasteners	High-Strength Alloy Steel	ASTM A193 B7/B16, A194 2H/8M - High-Temperature & Corrosion Resistant

Standards & Compliance

Design Standards: DIN 3352 Part 1, DIN 3202 F1/F2, API 600, BS 1414
Flange Standards: DIN 2501, DIN 2533, EN 1092-1, ASME B16.5
Testing Standards: DIN 3230, API 598, BS 6755, EN 12266-1 (Hydrostatic, Shell, Leakage Testing)
Certifications: ISO 9001, CE, API 600, PED 2014/68/EU

Working Principle

The DIN Metal Seated RS Gate Valve controls fluid flow through the interaction between a hardfaced metal disc and metal seat, with an externally rising stem mechanism:

Opening Process: Rotating the handwheel or actuator drives the stem to rotate and move vertically upwards. The stem's threaded connection lifts the disc away from the metal seat to open the fluid passage. The rising stem provides clear visual indication of the open position.
Closing Process: Reverse rotation of the handwheel/actuator lowers the stem and disc onto the metal seat. The precision-machined metal surfaces create a tight seal, blocking fluid flow. The stem moves downwards, indicating the closed position.
Sealing Assurance: The metal-to-metal seating design ensures reliable shut-off even at high temperatures and pressures. The hardfaced surfaces resist wear and erosion, maintaining sealing integrity over thousands of operating cycles.

Application Areas

Power Generation

Boiler feedwater, steam lines, ash handling systems, and flue gas desulfurization (FGD) processes.

Oil & Gas Industry

Crude oil pipelines, gas transmission, refinery processes, and offshore platform applications.

Chemical Processing

High-temperature chemical reactors, acid/alkali transfer, and petrochemical processing plants.

Mining & Minerals

Slurry pipelines, tailings disposal, and abrasive mineral processing applications.

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 flow), ensure sufficient vertical space for stem movement when opening.
Tighten flange bolts evenly in a crisscross pattern to avoid uneven pressure on the sealing surface.
Ensure handwheel/actuator is accessible for operation and maintenance, with adequate clearance for stem rise.
Conduct hydrostatic testing (1.5×PN) and leakage testing after installation before commissioning.

Maintenance Recommendations

Regularly inspect stem packing for leaks; adjust or replace packing as needed to maintain stem seal integrity.
Check metal seating surfaces for signs of wear or damage; recondition or replace hardfacing if necessary.
Lubricate stem threads annually with high-temperature grease to ensure smooth operation.
For long-term shutdown, keep valve fully open to prevent media from settling on seating surfaces.
Use only manufacturer-recommended replacement parts to maintain performance and compliance with standards.

Frequently Asked Questions (FAQ)

Q: What is the difference between RS and NRS gate valves?

A: RS (Rising Stem) valves have a stem that extends vertically when opened, providing visual position indication. NRS (Non-Rising Stem) valves keep the stem enclosed within the body during operation, ideal for space-constrained installations.

Q: Can metal seated valves handle abrasive media?

A: Yes, our metal seated valves feature hardfaced Stellite or WC-Co seating surfaces that resist wear from abrasive media such as slurry, ash, and particulate-laden fluids.

Q: What is the maximum temperature rating for these valves?

A: Standard metal seated RS gate valves can operate up to 600°C. For higher temperatures, custom materials and designs are available—contact our technical team for solutions.

Q: How much vertical space is required for the rising stem?

A: The vertical space required depends on the valve size and stem travel. As a general rule, allow approximately 1.5 times the valve's nominal diameter for stem extension when fully open.

Need Custom Solutions?

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

Contact Our Technical Team