3-Piece Pneumatic Ball Valve – Precision Control, Zero Leakage, Smart Automation

2026-06-02 0 Leave me a message

The 3-Piece Pneumatic Ball Valve combines a heavy-duty three-piece body construction with a compact, high-cycle pneumatic actuator. Designed for both on/off and modulating control applications, this valve delivers zero leakage, low pressure drop, and long service life in demanding process environments.

Available with PTFE soft seal or metal hard seal, and compatible with single-acting (spring return) or double-acting actuators, the Joepai 3-piece pneumatic ball valve offers flexible automation for your pipeline system.

3-Piece Pneumatic Ball Valve

Key Features

Feature	Benefit
3-piece body design	Easy inline maintenance – replace seats/seals without removing pipework
Floating ball	Reliable sealing under high pressure
PTFE or metal hard seal	Zero leakage (≤0.0005 ml/h, ANSI Class VI)
Full bore / reduced bore	Minimal pressure drop, energy saving
Single-acting (spring return)	Fail-safe: automatically closes on air loss
Double-acting	Higher torque, faster cycling
Wide temp range	-40℃ to 425℃ (PTFE to metal seal)
Multi-standard connections	ANSI / DIN / JIS flange or threaded

3-Piece Pneumatic Ball Valve

How It Works – Pneumatic Actuator Operation

The pneumatic actuator uses compressed air to rotate the ball valve 90° for open/close control. Below is the standard operating principle for double-acting and single-acting actuators.

Double-Acting Actuator (Air-to-Open / Air-to-Close)

3-Piece Pneumatic Ball Valve

No spring – requires air supply on both sides for operation

Action	Air Supply Port	Exhaust Port	Piston Movement	Valve Status
Open Valve	Port 2	Port 4	Pistons move outward	Open
Close Valve	Port 4	Port 2	Pistons move inward	Closed

Diagram description (double-acting):

Port 2 = intake to open valve – compressed air drives two pistons apart

Port 4 = intake to close valve – compressed air drives two pistons toward center

Single-Acting Actuator (Spring Return – Normally Closed)

3-Piece Pneumatic Ball Valve

Spring provides fail-safe closure when air supply is lost

Action	Air Supply Port	Exhaust Port	Spring State	Valve Status
Open Valve	Port 2	Port 4	Spring compressed	Open
Close Valve	Air exhausted from Port 2, spring releases	Port 4 (optional)	Spring extends	Closed

Diagram description (single-acting):

Port 2 = intake to open valve – air pressure compresses the spring, moving pistons outward

Port 4 (or spring chamber) = when air is exhausted from Port 2, spring force returns pistons to closed position

Why Choose Joepai 3-Piece Pneumatic Ball Valve?

1. Precision Sealing – Zero Leakage

Static leakage rate ≤0.0005 ml/h, meeting ANSI Class VI standard. PTFE soft seal for general media, metal hard seal for high-temperature or abrasive media.

2. Streamlined Design – Minimal Pressure Drop

Full-bore design provides a near-straight-pipe flow path, reducing system pressure loss and saving pumping energy.

3. Superior Corrosion Resistance

Body materials: Carbon steel, WCB, SS304, SS316L. Special anti-corrosion treatment extends service life in water, oil, gas, and mild corrosive media.

4. Precision & Intelligence (Optional)

Positioner – 4-20mA signal for modulating control, accuracy ±0.1%

Limit switches – open/close position feedback

Solenoid valve – 24V DC / 220V AC for remote on/off control

FRL (Filter, Regulator, Lubricator) – clean and regulated air supply

5. Predictive Maintenance (Smart Option)

Integrated intelligent monitoring provides up to 180 hours advance fault warning, reducing unplanned downtime by over 40%.

Technical Specifications

Parameter	Value
Valve type	3-piece ball valve
Size range	DN6 to DN100 (3/8" to 4")
Pressure rating	PN16 / PN25 / PN40 / PN63
Body material	SS304 / SS316 / Carbon steel WCB
Seat material	PTFE (soft) / PEEK or metal (hard seal)
Temperature range	-40℃ to 425℃
End connections	Flanged (ANSI/DIN/JIS) or threaded (NPT/BSP)
Actuator type	Pneumatic – single-acting (spring return) or double-acting
Port identification	Port 2 and Port 4 (industry standard)
Optional accessories	Solenoid valve, limit switch, positioner, FRL

Applications

Petrochemical & chemical processing

Municipal gas transmission

Water and wastewater treatment

Power generation

Food & pharmaceutical (sanitary version available)

Metallurgy and industrial fluid control

Service & Support

Service	Details
Warranty	12 months from shipment date (materials & workmanship)
Custom engineering	On-demand modification for unique applications
Technical support	24/7 via email or hotline
OEM/ODM	Available – mold design, material selection, accessory integration