DN1200 PN10 RF DIN Standard Dual Plate Check Valve – 1.1138
DN1200 PN10 Raised Face (RF) Double Flanged Dual Plate Check Valve (1.1138 Body, Double Flanged Dual Plate Design (H46)). Manufactured to EN 12334 / DIN EN 558 and EN 1092-1 Type 21 with twin Inconel X-750 torsion springs and Stellite hardfaced seats. Features dynamic spring-assisted non-slam closure, retainerless fugitive emission-free body architecture, compact face-to-face length (524 mm), and 80% weight reduction relative to traditional swing check valves for severe pump discharge protection.
Description
The DN1200 PN10 RF Flanged Ends DIN Standard Dual Plate Check Valve (1.1138) is an engineered high-performance, non-slam flow protection device manufactured by XIAMEN GUTE VALVE MANUFACTURING COMPANY. Designed in strict compliance with EN 12334 / DIN EN 558 and international piping standards, it provides permanent, zero-leakage reverse flow prevention to safeguard critical high-pressure pumps, compressors, and rotating machinery from destructive backflow surges. Utilizing twin spring-energized D-shaped plates, high-tensile Inconel X-750 torsion springs, precision Stellite hardfaced seating, and an advanced retainerless fugitive-emission-free body architecture, it delivers instantaneous dynamic closure before flow deceleration, completely eliminating destructive water hammer across demanding petrochemical, refinery, power generation, and water utility networks.
Engineering Configuration
DN1200 | PN10 | Dual Plate Check Valve | 1.1138 | RF Flanged Ends
- Face-to-Face Length (L): 524 mm (EN 12334 / DIN EN 558)
- Net Weight: 1400 kg (~75% lighter than equivalent swing check valve)
- Structural Body Architecture: Double Flanged Dual Plate Design (H46) (Double flanged integral body designed with standardized face-to-face dimensions for direct replacement of bulky swing check valves while eliminating water hammer.)
- Seating Architecture: Precision Lapped Metal-to-Metal (Stellite 6 Overlay) / Resilient O-Ring
- Dynamic Spring Mechanism: Twin Independent Inconel X-750 Helical Torsion Springs
- Emissions & Penetration Containment: 100% Retainerless internal pin retention (Zero body wall penetrations)
Core Structural Engineering: Spring-Assisted Non-Slam Dynamics & Retainerless Integrity
The dual plate geometry represents a major technological leap in non-return valve mechanics, resolving the severe pressure surge, pipe vibration, and water hammer destruction inherent in conventional single-disc swing check valves.
- Zero Water Hammer Surge: The twin semi-circular plates divide the flow cross-section in half, reducing the center-of-mass travel distance by 50%. Driven by high-response Inconel springs, the plates close at the exact instant forward velocity decelerates to zero, preventing reverse flow slam.
- Retainerless Body Integrity: Hinge and stop pins are completely secured inside the valve bore by internal precision blind bushings and retention plates. The elimination of through-body drilled holes and threaded side plugs permanently removes potential fugitive emission leak paths.
- Independent Dual Spring Action: Each plate is energized by its own dedicated torsion spring leg, ensuring balanced closing dynamics and maintaining fail-safe non-slam performance even under asymmetric piping flow profiles.
Rigorous Quality Assurance & Inspection Protocols
Every dual plate check valve undergoes 100% multi-stage factory quality control and non-destructive testing per DIN EN 12266-1 / ISO 5208 standards to guarantee zero leakage and structural integrity:
- 1. Material Chemistry Analysis (PMI): 100% spectroscopic verification on all pressure-retaining casting heats confirming chemical compliance per EN 10204 3.1 Mill Test Reports (MTR).
- 2. Dye Penetrant & NDE Testing (PT): PT examination on Stellite hardfaced seating boundaries and critical internal fillet radii to ensure zero surface flaws.
- 3. Final Dimensional Inspection: Rigorous dimensional verification on critical face-to-face, flange drilling, and plate travel clearances against engineering drawings.
- 4. Hydrostatic & High/Low Pressure Seat Testing: 100% shell hydrostatic test at 1.5x rating and reverse seat closure testing per DIN EN 12266-1 / ISO 5208 (Rate A bubble-tight verification).
Frequently Asked Technical Questions
A: In large-bore piping (DN1200), fluid turbulence and vortex shedding can induce plate vibration. Gute incorporates heavy-duty central hinge and stop pins supported by precision sleeve bushings. Independent dual Inconel torsion springs provide balanced pre-load across both plate halves, while engineered backstop lugs prevent plate over-travel and heel impingement, ensuring laminar flow stability and extended operational life.
A: Standard dual plate check valves often utilize through-body hinge pin holes sealed with external threaded side plugs, creating potential secondary leak paths. Gute Retainerless construction secures the hinge and stop pins entirely inside the valve bore using blind internal bushings and retention plates. The absence of external body penetrations permanently eliminates fugitive atmospheric emissions, satisfying ISO 15848-1 and German TA-Luft.
A: Yes. Because the dual plates are positively energized by independent Inconel torsion springs, the closure mechanism operates independently of gravity. The valve can be installed in horizontal lines (with the central hinge pin oriented vertically) and in vertical lines with upward flow. (Note: Installation in vertical lines with downward flow is not recommended per standard piping practice).
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Additional information
| Material | |
|---|---|
| Pressure | |
| Valve Size | |
| Connection | |
| Design Standard | DIN Standard |
| Size | DN1200 |
| Pressure Class | PN10 |
| Body Material | 1.1138 |
| End Connection | RF |
| Operation | Automatic (Line Fluid Operated) |
| Design Structure | Double Flanged (H46) |
| Manufacturer | XIAMEN GUTE VALVE MANUFACTURING COMPANY |
| Trim / Disc Type | Inconel X-750 Spring + Stellite Hardfaced |
