Inner check valve: The check valve inside the valve body to insure the hydraulic ail not to be returned.Inner relief valve: The relief valve inside the valve body is able to adjust the hydraulic system working pressure.
Oil way: Parallel circuit, with power beyond.Control Way: pneumatic control, manual control
Valve construction: monoblock construction, 1-7 levers are avallable to assembled as you requests.Spool Function
ZDa-L15 Pneumatic Control Valve: Comprehensive Analysis
1. Product Overview
• Model: ZDa-L15
• Type: Pneumatic Control Valve (single-acting or double-acting, depending on configuration).
• Purpose: Automated regulation of fluid (gas/liquid) flow, pressure, or level in industrial processes.
• Key Feature: Fully pneumatic-driven, suitable for explosion-proof, hazardous, or remote environments where electricity is restricted.
2. Technical Specifications (Example, Subject to Manufacturer Data)
【表格】
Parameter Specification
Nominal Diameter (DN) DN15 (customizable sizes: DN10–DN100)
Connection Type Flange, thread, or welded (depending on application)
Actuator Type Double-acting or spring-return (single-acting)
Air Supply Pressure 0.3–0.8 MPa (adjustable for precise control)
Response Time ≤ 0.5 seconds (double-acting, typical)
Temperature Range -20°C to +150°C (medium temperature)
Valve Body Material Stainless steel (SS304/SS316), cast iron, or alloy
Sealing Material PTFE, NBR, or metal-to-metal (high-temp applications)
Control Signal 3–5 psi, 4–20mA (via I/P converter), or digital solenoid control
3. Key Features & Benefits
• Explosion-Proof Design:
• No electrical components, ideal for flammable/explosive environments (e.g., oil refineries, chemical plants).
• Fast Response:
• Pneumatic actuation enables near-instantaneous opening/closing (critical for safety shutdowns).
• High Reliability:
• Minimal moving parts, low maintenance, and long service life in harsh conditions.
• Customizable Control:
• Supports proportional, on/off, or modulating control via pneumatic or electro-pneumatic systems.
• Wide Compatibility:
• Compatible with standard pneumatic controllers, PLCs, or manual override systems.
4. Working Principle
• Double-Acting Mode:
• Air pressure opens/closes the valve via a piston (requires continuous air supply).
• Spring-Return (Single-Acting) Mode:
• Air pressure opens the valve; a spring returns it to the default position (failsafe design).
• Control Logic:
• Pneumatic signals (3–5 psi) or electro-pneumatic converters (4–20mA) adjust valve position.
5. Applications
【表格】
Industry Application Example
Oil & Gas Pipeline pressure regulation, emergency shutdown valves
Chemical Processing Corrosive medium control, reactor temperature regulation
Water Treatment Chlorine dosing, pH adjustment
Food & Beverage Sterile environment control (CIP/SIP systems)
Power Generation Steam turbine bypass control, boiler feedwater regulation
6. Selection Criteria
• Media Compatibility:
• For corrosive/abrasive fluids, select SS316 or alloy valve bodies with PTFE seals.
• Actuator Type:
• Double-acting: For precise, continuous modulation (e.g., pressure control).
• Spring-return: For failsafe operation (e.g., emergency shutdown).
• Control Signal:
• Use a pneumatic controller (3–5 psi) for standalone systems or an I/P converter for PLC integration.
• Environmental Conditions:
• High-temperature/high-pressure applications require metal-to-metal seals or specialized alloys.
7. Installation & Maintenance Tips
• Installation:
• Ensure proper air supply filtration (to prevent actuator contamination).
• Install the valve in the correct orientation (arrow marks indicate flow direction).
• Maintenance:
• Regularly check air supply quality and lubricate the actuator (if required).
• Inspect seals for wear (replace every 1–2 years, depending on usage).
• Troubleshooting:
• Valve not responding: Check air supply pressure, solenoid valve operation, or actuator leaks.
• Leakage: Tighten fittings or replace seals.
8. Comparison with Electric Control Valves
【表格】
Factor Pneumatic (ZDa-L15) Electric Control Valve
Power Source Compressed air Electricity
Response Time Faster (milliseconds) Slower (seconds, depending on motor)
Explosion-Proof Yes (intrinsically safe) Requires explosion-proof certification
Cost Lower (initial + operating) Higher (motor + controller costs)
Precision Moderate (proportional control) Higher (servo-driven precision)
9. Summary & Recommendation
• Best For:
• Hazardous environments, rapid response needs, or cost-sensitive applications.
• Avoid If:
• High-precision control is required (electric valves are better suited).
• Recommended Accessories:
• Pneumatic filter-regulator-lubricator (FRL) unit.
• Positioner (for proportional control).
• Solenoid valve (for remote on/off operation).
For detailed technical drawings, CAD models, or customization options, contact the manufacturer or a certified distributor.
