I. Model Naming Logic (Inferred)
1. ZNV Series Designation
• Zmay represent "Flow Control" or a specific brand/product line code.
• NVlikely indicates "Needle Valve" or "Variable Valve," commonly used in applications requiring precise flow adjustment.
• Numeric suffixes (08/10/12)typically correspond to the valve's nominal bore size (e.g., DN8, DN10, DN12) or flow coefficient (Cv value). For example:
• ZNV08: Suitable for low-flow applications (e.g., Cv ≈ 0.1–0.5) with a 8mm bore.
• ZNV10/ZNV12: Larger bore sizes for increased flow ranges (e.g., Cv ≈ 0.5–1.5).
2. Application Context
• If designed for hydraulic systems, these valves may control the speed of actuators (e.g., cylinders, motors).
• If for pneumatic systems, they may regulate cylinder speed or gas flow distribution.
II. Core Functions and Design Features
1. Flow Adjustment Capability
• Flow is adjusted continuously by rotating the valve core to modify the throttle orifice area.
• May include a locking mechanism to prevent unintended valve core movement after adjustment.
2. Pressure Compensation Design (Optional)
• Some models may integrate a pressure compensator to maintain consistent flow despite load pressure fluctuations (e.g., Danfoss pressure-compensated flow valves).
• Ideal for multi-actuator parallel systems requiring synchronized motion (e.g., injection molding machine clamping units).
3. Sealing and Pressure Resistance
• Sealing materials may include NBR (nitrile rubber) or FKM (fluororubber) for compatibility with mineral oils, water-based hydraulic fluids, etc.
• Rated pressure may reach 210 bar (3000 psi) or higher, depending on the application.
4. Installation and Interface Options
• Threaded connections (e.g., G1/8, G1/4) or flange mounts for easy integration into pipelines or valve blocks.
• Some models support stackable installation to save space and simplify piping.
III. Typical Applications
1. Hydraulic Systems
• Control cylinder speed (e.g., machine tool feed, die-casting machine clamping/unclamping).
• Regulate hydraulic motor rotational speed (e.g., construction equipment slewing drives).
2. Pneumatic Systems
• Control cylinder stroke speed (e.g., automated assembly line grippers).
• Adjust gas flow distribution (e.g., pneumatic tool air supply).
3. Industrial Automation
• Enable closed-loop flow control when paired with sensors and controllers (e.g., tension control systems).
• Used in analog load testing (e.g., valve performance test benches).
IV. Selection Guidelines
1. Define Flow Requirements
• Select valve bore size and Cv value based on the system's maximum and minimum flow demands.
• Example: For a flow range of 0.5–5 L/min, ZNV10 (assuming Cv ≈ 0.8) may be suitable.
2. Verify Pressure Rating
• Ensure the valve's rated pressure exceeds the system's maximum operating pressure (e.g., choose ≥210 bar for a 160 bar system).
3. Check Media Compatibility
• Select sealing materials and valve body materials based on the working medium (e.g., stainless steel + FKM for corrosive fluids).
