Description
The 6DR4004-8VL is a Siemens SIPART PS2 reduced mounting kit specifically engineered for attaching the SIPART PS2 electropneumatic positioner to NAMUR-compliant linear actuators per IEC 60534. Unlike the full 6DR4004-8V kit, the “reduced” 6DR4004-8VL omits the fixing angle and U-bolt bracket — it is intended for actuators with integrated mounting features (fin, column, or plane surface) where those extra hardware pieces are unnecessary. The “L” suffix denotes the long lever arm, covering stroke ranges from 35 mm up to 130 mm. All metal parts are VA stainless steel, and the kit ships pre-assembled (long lever, pickup bracket, clamping assembly, screws) for a direct fit onto the PS2 positioner body.
Application Scenarios
In a German specialty-chemical batch plant, the solvent-recovery column’s reflux valve runs on a NAMUR linear actuator with an integrated cast column — the kind where a full 6DR4004-8V kit (with its U-bolt and fixing angle) would leave you stacking hardware that has nowhere to bolt. The I&E crew was retrofitting twelve such valves from pneumatic-only positioners to SIPART PS2 HART units for digital valve signature diagnostics. Specifying the 6DR4004-8VL instead of the standard 8V shaved roughly 15 minutes per valve: no U-bolt to fish behind the column, no fixing-angle alignment, just the NAMUR bracket onto the column face, pickup bracket onto the actuator stem, and the long lever (pre-set for the 80 mm stroke) snapped in. Commissioning twelve valves in one shift instead of two — the 6DR4004-8VL didn’t just save hardware cost; it saved the window. For anyone mounting PS2 onto actuators with integrated NAMUR geometry, the reduced kit is the right-fit answer; the full 8V is overkill and the 8VK (short lever) would max out at 35 mm and leave you short on a 60–100 mm stroke valve.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 6DR4004-8VL |
| Manufacturer | Siemens (SIPART PS2 accessory family) |
| Product Category | Reduced mounting kit for NAMUR linear actuators |
| Stroke Range | 35 – 130 mm (long lever configuration) |
| Mounting Standard | NAMUR / IEC 60534 (linear actuators with integrated mounting) |
| Lever Type | Long lever (pre-assembled on pickup bracket) |
| Material | VA stainless steel (all metal parts) |
| Kit Contents | Long lever, pickup bracket, clamping pieces, carrier pin / pulley, screws |
| Excluded vs. 8V | Omits fixing angle and U-bolt bracket (hence “reduced”) |
| Compatible Positioner | SIPART PS2 (6DR4xxx aluminum / 6DR5xxx flameproof-stainless*) |
| Actuator Types | Linear with fin / column / plane integrated mount (Fisher 657/667, Masoneilan 87/88, etc.) |
| Net Weight | ~0.1 kg |
| Lifecycle Status | Active (Siemens SIPART PS2 current accessory) |
*Note: Integrated mounting (reduced kit) not permitted with flameproof stainless enclosure 6DR5..6 per Siemens manual.
Technical Principles and Innovative Values
Innovation Point 1: “Reduced” Geometry for Integrated-Mount Actuators. The 6DR4004-8VL strips away the fixing angle and U-bolt that the full 6DR4004-8V carries — those two parts exist to create a NAMUR face on actuators that don’t have one (plain yoke, no column). On actuators that already present a fin/column/plane NAMUR interface, the 6DR4004-8VL bolts straight on. Less hardware = fewer torques to chase, fewer galvanic-corrosion pairs, and a cleaner cabinet-adjacent profile.
Innovation Point 2: Long Lever Pre-Assembled, 35–130 mm Coverage. The “L” in 6DR4004-8VL is the long lever (versus the short lever on 8V / 8VK). For strokes >35 mm up to 130 mm, the lever-pulley geometry must track the actuator stem without saturating the PS2’s cam travel. The 6DR4004-8VL ships with the long lever already pivoted onto the pickup bracket — no loose pin to drop into the trench during install.
Innovation Point 3: VA Steel in a Corrosion-First Design. Every metal part in the 6DR4004-8VL is VA stainless (the clamping pieces, the pickup bracket saddle, the lever, the screws). In chemical-fog or coastal-power environments where plain steel mounting hardware rust-welds to the actuator column inside two seasons, the 6DR4004-8VL stays serviceable — which matters because the pickup bracket is the mechanical link between valve stem and PS2 sensor; any slop here shows up as positioning hysteresis before the process ever sees it.
Application Cases and Industry Value
A Middle East desalination plant running seawater RO feed-control valves (Fisher 657, ~90 mm stroke, NAMUR column-integrated) standardized the Siemens 6DR4004-8VL across a PS2 retrofit of 28 control loops. Previously the contractor had tried the full 6DR4004-8V on the first three valves and found the U-bolt + fixing angle created a cantilever that fouled a nearby pneumatic tubing run — plus two hours per valve trimming. Switching the BOM to 6DR4004-8VL (reduced, long lever) cleared the tubing conflict and cut install time to 45 min/valve. Post-commissioning, the plant ran valve-signature tests across all 28 loops; the 6DR4004-8VL-mounted PS2 units showed average hysteresis < 0.4% of span — identical to the 8V-mounted units, confirming the reduced kit loses nothing on metrology when the actuator already has the NAMUR face. The plant’s I&C lead noted the 6DR4004-8VL as “the kit we should have spec’d from drawing review” — a classic case where reading the actuator datasheet before picking the mounting SKU pays back.
Related Product Combination Solutions
These models sit alongside or substitute for the 6DR4004-8VL in SIPART PS2 linear-actuator BOMs:
- 6DR4004-8V – Standard NAMUR kit, short lever (3–35 mm), with fixing angle + U-bolt. Use this when the actuator has no integrated NAMUR face and you need to build one.
- 6DR4004-8VK – Reduced kit, short lever (≤35 mm). Same “reduced” concept as 6DR4004-8VL but short-lever — for integrated-mount actuators with small strokes (e.g., damper, small globe).
- 6DR4004-8L – Long lever alone (35–130 mm), no NAMUR bracket. Buy this if you already have a 6DR4004-8V on the shelf and just need to extend to a >35 mm stroke valve.
- 6DR4004-0… – SIPART PS2 positioner body (aluminum, 4–20 mA / HART / PROFIBUS PA variants). The 6DR4004-8VL exists solely to mount this onto a linear actuator.
- 6DR5010-0… – SIPART PS2 flameproof enclosure (Ex d). Note: Siemens manual prohibits reduced-kit (8VK/8VL) mounting on 6DR5..6 flameproof stainless — use full 6DR4004-8V there.
- 6DR4004-3N – Stainless 316 roll & disk replacement set, for upgrading the Teflon/aluminum wear parts inside 8V/8VK/8VL kits in aggressively corrosive service.
- 6DR4004-3M – Stainless 316 terminal block replacement set, same corrosion-upgrade path for the 8V/8VK/8VL family.