Fisher 38B5786X112 DVC Relay — Precision Pneumatic Relay Module | Emerson DVC6000 Series Platform
Engineering Background: The Fisher DVC6000 series Digital Valve Controller is Emerson’s flagship smart positioner platform, deployed across refining, petrochemical, power generation, and pipeline infrastructure worldwide. The relay assembly is the pneumatic heart of the DVC6000 — it converts the I/P transducer output into precise, high-flow pneumatic signals that drive the actuator. Part number 38B5786X112 is the OEM-specified relay module for single-acting DVC6000 configurations, engineered to maintain sub-1% positioning accuracy under demanding process conditions.
Product Positioning: Konmask.com supplies this relay as a verified OEM-equivalent replacement for maintenance, MRO, and capital project procurement. It is the correct specification for engineers requiring a drop-in replacement that preserves HART communication integrity, SIL-rated loop performance, and Fisher factory calibration baselines.
Complete Technical Specifications
- Manufacturer: Fisher Controls International (Emerson Automation Solutions)
- Part Number / SKU: 38B5786X112
- Assembly Type: Pneumatic Relay Module (Single-Acting)
- Compatible Platform: Fisher DVC6000 / DVC6000f / DVC6000 SIS Digital Valve Controllers
- Supply Pressure Range: 1.4 – 10.0 bar (20 – 145 psi)
- Output Pressure Range: 0 – Supply Pressure
- Air Consumption (Steady State): ≤ 0.14 Nm³/h at 1.4 bar supply
- Stroking Speed (Full Stroke): Adjustable via DVC6000 travel control
- Operating Temperature: −40°C to +85°C (−40°F to +185°F)
- Body Material: Zinc die-cast with chromate conversion coating
- Port Configuration: 1/4 NPT supply, output, and exhaust ports
- Approximate Weight: 360 g
- Certifications: CE, ATEX, IECEx (as part of DVC6000 assembly)
- HS Code: 8481.20 (Valves for pneumatic transmission)
Proven Application Environments
- Crude oil and natural gas processing — control valve actuator positioning in high-cycle service
- Refinery distillation columns — precise pressure and flow control loops
- LNG terminals — cryogenic-adjacent service with wide temperature swing tolerance
- Power plant feedwater and steam control — high-availability SIL 2 loops
- Chemical batch reactors — repeatable positioning for recipe-critical valves
- Pipeline compressor stations — remote HART-monitored valve diagnostics
Engineering Advantages
- OEM Dimensional Compliance: Direct bolt-on replacement; no field modification required to DVC6000 housing or pneumatic manifold.
- HART Diagnostic Preservation: Relay geometry maintains the pneumatic response curve required for Fisher ValveLink™ and AMS Device Manager signature diagnostics.
- High Cv Flow Capacity: Engineered for fast stroking response without sacrificing steady-state accuracy — critical for ESD and partial-stroke test (PST) applications.
- Corrosion-Resistant Construction: Zinc die-cast body with protective coating rated for offshore and chemically aggressive atmospheres.
- Low Steady-State Air Consumption: Reduces instrument air utility costs in large valve installations.
System Architecture & Signal Flow
In the DVC6000 control loop, the 4–20 mA input signal is processed by the digital controller board, which commands the I/P converter to produce a proportional pneumatic pilot signal. The 38B5786X112 relay amplifies this pilot signal — boosting both pressure and flow capacity — to drive the actuator cylinder directly. The relay’s exhaust port vents actuator back-pressure during stroke reversal, enabling fast, accurate repositioning. The integrated feedback linkage returns actual stem position to the controller for closed-loop correction.
Signal path: 4–20 mA input → DVC6000 controller board → I/P transducer → 38B5786X112 relay → actuator cylinder → stem position feedback → controller
Sourcing & Quality Verification
- Origin: Sourced from authorized Fisher/Emerson distribution channels and verified MRO surplus with full traceability documentation.
- Inspection: Each unit undergoes visual inspection, dimensional verification, and pneumatic leak test prior to shipment.
- Packaging: Anti-static bag + foam-lined carton; port caps installed to prevent contamination in transit.
- Documentation Available: Certificate of Conformance (CoC), Fisher part number label verification, and packing list on request.
- Warranty: 12-month warranty against manufacturing defects from date of shipment.
Procurement Process
- Confirm part number 38B5786X112 against your DVC6000 nameplate or Fisher parts list (document D102794X012).
- Submit your order via Konmask.com or contact [email protected] for volume pricing and lead time confirmation.
- Provide shipping address and preferred Incoterms (EXW, FOB Xiamen, CIF available).
- Payment: T/T, PayPal, or credit card via Shopify Payments.
- Typical dispatch: 1–3 business days after payment confirmation. International express (DHL/FedEx) available.
Technical FAQ
- Q: Is 38B5786X112 compatible with DVC6010, DVC6020, and DVC6030 variants?
- A: Yes. The relay assembly is common across the DVC6000 platform family for single-acting configurations. Verify actuator action (direct/reverse) before ordering.
- Q: Can this relay be used in a double-acting actuator configuration?
- A: No. Double-acting configurations require a different relay part number. Contact us with your actuator model for cross-reference assistance.
- Q: Does replacement require recalibration of the DVC6000?
- A: A full auto-calibration (Auto Setup) via ValveLink or AMS is recommended after relay replacement to re-establish the pneumatic signature baseline.
- Q: What is the lead time for bulk orders (>10 units)?
- A: Contact us at [email protected] for stock availability and volume pricing. Most bulk orders ship within 5–7 business days.
- Q: Do you provide export documentation for customs clearance?
- A: Yes. Commercial invoice, packing list, and CoC are standard. HS code 8481.20 applies. Country of origin documentation available on request.
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