Siemens C73451-A430-D81 SIPART PS2 double-acting pneumatic block

Evidence-backed reference for a Siemens SIPART PS2 double-acting pneumatic block.

Documented system function and position

Rebuilt from individual evidence

The fetched Siemens SiePortal PDF identifies C73451-A430-D81 as a double-acting pneumatic block.

The document states that it includes a seal and screws for SIPART PS2 6DR5.2 and has active product status.

Its system position is inferred as the pneumatic path between the SIPART PS2 positioner and a connected actuator.

Unknown: Exact 6DR5.2 variant, pressure limits, seal material, installation orientation, and local availability require separate verification.

Exact reference: C73451-A430-D81
Category: PLC / CPU
Evidence checked: 2026-09-12

System role

This section explains what the product does and where it acts in the surrounding system.

Function: Routes pneumatic connections for a double-acting SIPART PS2 valve-positioner assembly.
System position: Sits in the pneumatic path between the SIPART PS2 6DR5.2 positioner and its connected actuator.
Upstream / inputs: Receives the pneumatic connection and mounting interface documented for the SIPART PS2 assembly.
Downstream / outputs: Passes pneumatic control to the connected double-acting actuator through the block.
Limitations: Unknown: Exact 6DR5.2 variant, pressure limits, seal material, installation orientation, and local availability require separate verification.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

The fetched Siemens SiePortal PDF identifies C73451-A430-D81 as a double-acting pneumatic block.
Confidence: high
- 5.imimg.com — retrieved 2026-09-12; high confidence
The document states that it includes a seal and screws for SIPART PS2 6DR5.2 and lists an active product status.
Confidence: high
- 5.imimg.com — retrieved 2026-09-12; high confidence

Inferences

The block sits in the pneumatic path between a SIPART PS2 6DR5.2 positioner and its connected double-acting actuator.
Confidence: medium
Rationale: The system position is inferred from the exact product function and the documented system or interface context.
- 5.imimg.com — retrieved 2026-09-12; high confidence

Unknowns

Unknown: Exact 6DR5.2 variant, pressure limits, seal material, installation orientation, and local availability require separate verification.
Confidence: low
Missing evidence: Exact 6DR5.2 variant, pressure limits, seal material, installation orientation, and local availability require separate verification.

System position diagram

Diagram showing C73451-A430-D81 between upstream system context and downstream equipment. — System position inferred from the Siemens product description and SIPART PS2 context.

View Mermaid source

flowchart LR
  U["Upstream system"] -->|"Pneumatic control connection"| P["C73451-A430-D81"]
  P -->|"Documented downstream path"| D["Downstream equipment"]

View diagram labels

Nodes: Upstream system; C73451-A430-D81; Downstream equipment
Edges: Pneumatic control connection

Next action

The available evidence supports a claim-linked identification of C73451-A430-D81 as a Siemens SIPART PS2 pneumatic block.

Verify the complete 6DR5.2 configuration, pneumatic ratings, seal requirements, and installation orientation before fitting.

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