Description
Key Technical Specifications
- Model Number: CZ1008DVA
- Manufacturer: Moog Inc.
- Valve Type: 2-way, 3-position (normally closed) servo proportional flow control valve
- Nominal Flow Rate: 8 l/min (2.1 US gal/min) at 10 bar (145 psi) differential pressure
- Maximum Operating Pressure: 350 bar (5075 psi) – continuous service
- Input Signal: 4-20mA DC (proportional control); 0-10V DC optional
- Supply Voltage: 24VDC ±10% (19.2-26.4VDC); 1.2A typical current draw
- Operating Temperature: -20°C to +80°C (-4°F to +176°F)
- Fluid Compatibility: Mineral oil (ISO VG 32-68), synthetic hydraulic fluids (MEK, HFD-R)
- Valve Body Material: 316 stainless steel (corrosion-resistant)
- Mounting Type: Subplate mounting (ISO 4401-03-02-0-05)
- Response Time: ≤50ms (90% step response from 4-20mA)
- Hysteresis: ≤1.5% of full-scale input (typical)
- Certifications: CE, UL 508, API 675 compliant, RoHS
- Compatibility: PLC/DCS systems (Siemens, Allen-Bradley, ABB), hydraulic actuators, turbine control systems, industrial filter assemblies
Moog CZ1008DVA
Field Application & Problem Solved
In industrial hydraulic systems—refinery process valve actuators, power plant turbine governors, steel mill roll positioning—the biggest control challenge is precise, repeatable flow control under high pressure and harsh conditions. Generic servo valves fail here in three critical ways: they drift under pressure spikes (causing actuator misalignment), can’t handle 350 bar operating pressure (leaking or seizing), or lack compatibility with standard 4-20mA PLC/DCS signals (requiring custom converters). A Texas refinery lost $210k in a 3-hour outage when a generic valve drifted during a hydraulic actuator stroke, misaligning a critical process valve and triggering a shutdown. A Pennsylvania steel mill spent $35k annually replacing generic valves that seized after exposure to mineral oil contaminants.
This valve solves these issues as a rugged, precision-engineered component for industrial hydraulics. You’ll find it in: hydraulic actuator control loops, turbine speed governors, roll gap positioning systems, and any application where 2-way flow control must be accurate (±1.5% repeatability) and reliable under extreme pressure. It’s mandatory for API 675-compliant systems, as it meets strict standards for flow control precision and durability in process industries.
Its core value is high-pressure reliability + DCS-native integration + low hysteresis. Unlike generics, it maintains calibration under 350 bar pressure spikes, accepts 4-20mA signals directly (no converters), and features a stainless steel body that resists corrosion from hydraulic fluids. For a Louisiana power plant, this valve improved turbine governor response time by 30%, reducing speed fluctuations and extending turbine life—avoiding a $180k unplanned outage from actuator misalignment.
Installation & Maintenance Pitfalls (Expert Tips)
- Fluid Contamination Is a Silent Killer: Rookies ignore Moog’s 10μm filter requirement, letting debris enter the valve spool. A Michigan steel mill’s valve seized after 6 months when a 25μm filter was used—always install a 10μm absolute filter upstream. Check filter differential pressure weekly; clogging causes flow starvation and valve damage.
- Input Signal Must Match Calibration: Using 0-10V instead of calibrated 4-20mA causes drift. A Florida refinery’s process valve actuator wandered until we reconfigured the PLC to output 4-20mA (the valve’s native signal). Verify signal type during commissioning—use a multimeter to confirm 4mA at minimum flow, 20mA at maximum.
- Mounting Torque: 25Nm (18.4 ft-lbs) Exact Value: Over-torquing subplate bolts warps the valve body, causing internal leakage. An Ohio chemical plant’s valve leaked 5 l/min after over-torquing—use a torque wrench with a deep socket to hit the spec. Always use new O-rings (Moog P/N 014-001-001) during installation.
- Avoid Dead-Ending the Outlet Port: Blocking the valve’s outlet creates pressure shocks that damage the spool. A Texas refinery’s valve failed during startup when the outlet line was pinched—ensure the hydraulic circuit has a relief valve (set to 350 bar) and no kinks in tubing.
- Regular Lubrication Prevents Sticking: Rookies skip lubricating the valve’s stem seal, leading to friction-induced drift. A North Carolina paper mill’s valve developed 5% hysteresis until we applied Moog-approved hydraulic fluid (ISO VG 46) to the seal. Lubricate during every 6-month maintenance cycle.
Moog CZ1008DVA
Technical Deep Dive & Overview
The Moog CZ1008DVA is a 2-way servo proportional valve engineered to deliver precise flow control for industrial hydraulic systems. At its core, a proportional solenoid actuator converts 4-20mA electrical signals into linear force, positioning a precision-machined spool within the valve body. The spool’s position regulates flow between the inlet and outlet ports—directly proportional to the input signal (4mA = minimum flow, 20mA = maximum flow). A built-in feedback potentiometer monitors spool position, adjusting the solenoid current to minimize hysteresis (≤1.5% full-scale) and ensure repeatability.
Unlike generic valves, its 316 stainless steel body withstands corrosion from hydraulic fluids and industrial environments, while the spool’s hard chrome plating resists wear from minor contaminants (when paired with a 10μm filter). The valve’s 350 bar maximum pressure rating makes it suitable for high-demand applications like turbine governors, where pressure spikes are common. The ISO 4401 subplate mounting ensures compatibility with standard hydraulic manifolds, simplifying retrofits.
What sets it apart is its DCS-native integration and rugged design. It accepts 4-20mA signals directly, eliminating the need for signal converters that introduce latency or drift. The valve’s response time (≤50ms) enables closed-loop control with hydraulic actuators, ensuring precise positioning even in dynamic applications. For maintenance teams, this valve isn’t just a flow control component—it’s a reliable link between PLC/DCS systems and hydraulic machinery, providing the precision and durability needed to prevent costly downtime in critical industrial processes. Its API 675 compliance and Moog’s reputation for servo valve expertise make it the gold standard for 2-way flow control in harsh industrial environments.
