Pneumatic Flanged Ball Valves

Double-Acting (DA) Rapid Cycling Series

Air-to-open and air-to-close design engineered for continuous high-speed production lines and automated distribution manifolds (DN15 to DN300 / 1/2" to 12"). Operates with balanced rack-and-pinion pneumatic pistons, delivering high output torque with minimal air consumption across millions of strokes.

• Fast stroke speeds between 0.5 and 1.5 seconds
• Symmetrical dual-piston transmission delivers smooth linear torque
• Cost-effective actuation footprint for facilities with stable utility air

Single-Acting Spring-Return (SR) Fail-Safe

Critical safety design for hazardous hydrocarbon and chemical pipelines. Built with pre-compressed internal spring cartridges that automatically drive the valve to a guaranteed mechanical Fail-Closed (NC) or Fail-Open (NO) position upon loss of air supply or electrical control power.

• Mechanical spring fail-safe protection requires zero backup electrical power
• Pre-stressed modular spring cartridges guarantee safe field servicing
• Meets SIL 2 and SIL 3 safety integrity system requirements

Sub-Second Rapid Actuation

Powered by low-friction pneumatic pistons, our valves complete 90° rotation in under 1 second. Delivers instantaneous shut-off for emergency isolation, tank overflow prevention, and automated high-speed batching skids.

Inherently Explosion-Proof Safety

Because compressed air generates zero electrical sparks, pneumatic actuators are inherently safe for hazardous Zone 0, 1, and 2 environments. Operates safely in combustible gas, volatile solvent, and chemical vapor zones without bulky flameproof motor housings.

1:1 Drop-In Face-to-Face Match

Manufactured strictly to ASME B16.10 and DIN 3202 F1/F4 face-to-face standards. Easily retrofits existing manual flanged ball or gate valves without cutting or welding pipe, drastically reducing plant turnaround downtime.

API 607 Fire-Safe & Anti-Static

Features secondary metal-to-metal seating that prevents leakage if primary soft seats burn away during a pipeline fire. Spring-loaded anti-static grounding balls eliminate static electricity buildup generated by high-velocity hydrocarbon flow.

Turnkey NAMUR Accessory Integration

Built with standardized NAMUR VDI/VDE 3845 top interfaces and NAMUR solenoid side pads. Easily accepts pilot solenoid valves (24VDC/220VAC), APL micro-switch limit switch boxes, and air filter regulators with plug-and-play simplicity.

Million-Cycle Actuator Durability

Extruded hard-anodized aluminum actuator cylinders with factory pre-lubricated Delrin guide bands. Tested beyond 1,000,000 continuous operating strokes without seal failure, delivering exceptional reliability for high-frequency cycling.

1. How do I choose between Double-Acting (DA) and Spring-Return (SR) actuators?

• Double-Acting (DA): Uses compressed air to both open and close the valve. It is more compact and economical, making it ideal when emergency fail-safe positioning is not required.

• Spring-Return (SR): Uses air pressure to stroke the valve in one direction while compressing heavy internal mechanical springs. If air pressure or pilot electrical power is lost, the springs instantly snap the valve shut (Fail-Closed) or open (Fail-Open) automatically.

2. What operating air pressure is required for DELCO pneumatic ball valves?

Standard DELCO pneumatic actuators are sized based on a standard industrial shop air supply of 0.5 MPa (5.0 bar / 72 psi), with operating ranges spanning 0.4 to 0.7 MPa (60 to 100 psi). For low-pressure plant air systems (0.3 MPa) or high-pressure gas actuation, our engineering team custom-sizes actuator cylinder bores to ensure a minimum 30% safety torque margin.

3. How does a pneumatic valve compare to an electric motorized valve in cycle speed?

Electric motorized valves require gear trains driven by electric motors, resulting in standard stroke speeds of 10 to 30 seconds. Pneumatic ball valves utilize direct air pressure against pistons, completing a full 90° stroke in 0.5 to 1.5 seconds. This sub-second speed is essential for emergency shutdown (ESD) applications and rapid industrial batch filling.

4. What standard pneumatic accessories does DELCO pre-install before dispatch?

DELCO supplies turnkey, factory-assembled pneumatic packages including:

• Solenoid Valves: Direct-mount 5/2-way (for double-acting) or 3/2-way (for spring-return) NAMUR pilot valves in 24VDC, 110VAC, or 220VAC (available in ATEX Ex d flameproof or Ex ia intrinsically safe).

• Limit Switch Boxes: APL-210N / 310N with beacon dome indicators and dual SPDT mechanical or inductive proximity switches.

• Air Filter Regulators: Clean compressed air and regulate pressure with moisture auto-drains.