C73451-A430-D81 Siemens SIPART PS2 Pneumatic Block Piezoelectric Valve Double-acting

C73451-A430-D81 Siemens SIPART PS2 Pneumatic Block Piezoelectric Valve Double-acting

Product Overview
The C73451-A430-D81 is a double-acting piezoelectric component specifically designed by Siemens for the SIPART PS2 series of intelligent electropneumatic valve positioners. This component delivers high-precision bidirectional control of rotary and linear actuators with millisecond response within a supply pressure range of 0.5–8 bar. It is an indispensable core component for valve positioning and flow control in process industries.

Core Advantages
- Imported – Made in Germany, meets ISO 8573-1 Air Quality Class 2, lifespan ≥ 10 million cycles
- Millisecond response – Piezoelectric pilot technology, <10 ms switching, flow regulation accuracy ±1%
- Wide-range compatibility – Compatible with the full range of 6DR5.2× positioners, plug-and-play, maintenance-free
- Harsh operating conditions – -30°C to +80°C operating temperature, IP66/NEMA 4X protection, resistant to 30 g vibration and 150 m/s² shock
- Low energy consumption – Steady-state air consumption <0.04 Nm³/h, significantly reducing operating costs
- Comprehensive certifications – ATEX, IECEx, EEx ia, EEx d, EEx n, FM, and CSA explosion-proof, suitable for Zone 1/2 hazardous areas

Technical Parameters
- Model Part No.: C73451-A430-D81
- Type: Double-acting piezoelectric actuator (includes seals and mounting screws)
- Supply pressure: 1.4 to 7 bar (20 to 101 psi)
- Flow rate: Inlet 9.8 Nm³/h @ 6 bar; Exhaust 19.2 Nm³/h @ 6 bar
- Supply port: G 1/4" internal thread (convertible to NPT)
- Material: Stainless steel 1.4404 valve core + anodized aluminum body, salt spray resistant for 1,000 hours
- Weight: 0.26 kg
- Ordering number: C73451-A430-D81

Typical Applications

Applications requiring high-precision valve positioning include oil and gas pipelines, refinery catalysis, chemical reactors, power plant desulfurization, pharmaceutical fermentation, food and beverage bottling, wastewater treatment, and seawater desalination.

Installation and Maintenance
1. Turn off the air supply and remove the positioner side cover.
2. Align the C73451-A430-D81 piezoelectric valve with the positioner slot and gently push until it snaps into place.
3. Secure with the included screws and check the seal for integrity.
4. Restore the air supply and perform automatic initialization (approximately 3 minutes).
5. It is recommended to inspect the filter regulator and air quality every 12 months. Lubrication is not required.

Product details pictures

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