What is a 1/4" ball valve with pneumatic actuator used for?

A 1/4 inch pneumatic actuated ball valve is used for automated on/off control in hydraulic test systems, pneumatic circuits, process control, leak testing equipment, and small-bore pipeline applications. The pneumatic actuator provides fast, reliable switching with fail-safe capability. Common applications include hydraulic oil pressure leak test benches, automated machinery, and process instrumentation.

What does 'fail-to-close' mean in a pneumatic actuated ball valve?

Fail-to-close (FC) means the valve automatically returns to the CLOSED position when air supply is lost or during a power failure. This is a critical safety feature in hydraulic oil systems and leak test applications where an uncontrolled open valve could cause oil spillage, equipment damage, or safety hazards. The spring return mechanism ensures the valve closes even without air or electrical power.

Can this valve handle 100 bar hydraulic oil pressure?

Yes, when specified with appropriate body material (forged stainless steel SS316 or carbon steel A105), this 1/4 inch ball valve assembly is rated for working pressures up to 100 bar (1450 PSI). The RPTFE (Reinforced PTFE) seat provides API 598 zero leakage performance even with high-pressure hydraulic oil (SAE 10) at temperatures up to 90°C.

What is the position feedback on this actuated ball valve?

The valve assembly includes 2 solid-state proximity switches (24VDC) - one for the fully OPEN position and one for the fully CLOSED position. These switches provide real-time position feedback to your PLC or control system, confirming the valve has completed its stroke. Solid-state switches are preferred over mechanical limit switches for their longer life and faster response.

Is this a direct replacement for Assured Automation A26NRXP8DC5BUB?

Yes, Supreme Valves India provides a suitable equivalent to the Assured Automation A26 series. Our 1/4 inch ball valve with dual scotch yoke pneumatic actuator matches the specifications: FNPT connection, RPTFE seat, 80 PSI air supply, double acting with fail-to-close, and 24VDC solid-state proximity switches for position feedback. We ensure dimensional and functional interchangeability.

1/4 inch Ball Valve with Pneumatic Actuator FNPT - Supreme Valves India

Pneumatic Actuated Ball Valve

1/4" 2-Way Ball Valve with Pneumatic Actuator & Position Feedback

Name: 1/4" 2-Way Ball Valve with Pneumatic Actuator & Position Feedback FNPT
Brand: Supreme Valves India
SKU: SV-BV-025-PA-FNPT-DA-FC
Price: 8500 INR
Availability: InStock
Rating: 4.9 (48 reviews)

Compact pneumatic actuated ball valve with dual scotch yoke actuator, double acting with fail-to-close safety. FNPT connection, RPTFE seat, API 598 zero leakage. Includes 2x solid-state 24VDC proximity switches for open/closed position feedback.

Quick Specifications

Size: 1/4" (DN8)

Connection: FNPT

Seat: RPTFE

Actuator: Dual Scotch Yoke

Function: Double Acting

Fail Safe: Fail to Closed

Air Pressure: 80 PSI (5.5 bar)

Feedback: 2x 24VDC Prox.

Key Applications

Hydraulic Oil Leak Test Automated Test Benches Process Automation Pneumatic Systems API 598 Zero Leakage

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Detailed Technical Specifications

Product Type	2-Way Ball Valve with Pneumatic Actuator Assembly
Valve Size	1/4" (DN8 / 8mm bore)
Port Type	Full Bore / Standard Port
Connection Type	FNPT (Female National Pipe Thread)
Seat & Seal Material	RPTFE (Reinforced PTFE) - Chemical resistant, high-temperature rated
Body Material	SS316 / SS304 / Carbon Steel (A105) - as per application
Ball Material	SS316 Chrome Plated / SS304
Stem Material	SS316 / SS304
Actuator Specifications
Actuator Type	P Series Dual Scotch Yoke Pneumatic Actuator
Function	Double Acting (DA) with Spring Return
Fail Safe Position	Fail to CLOSED - Valve closes on air/power loss
Supply Air Pressure	80 PSI (5.5 bar) — operates reliably at 5 bar plant air
Solenoid Valve	24VDC, 5/2 way or 5/3 way (included)
Position Feedback
Proximity Switches	2x Solid State Proximity Switches (1 for Open, 1 for Closed)
Switch Voltage	24VDC
Switch Output	NPN / PNP (as per requirement)
Operating Conditions
Max Working Pressure	100 bar (1450 PSI / 10 MPa)
Max Temperature	90°C (194°F)
Media	Hydraulic Oil (SAE 10), Compressed Air, Water, Steam, Gas
Testing Standard	API 598 — Zero Leakage
Line Size Compatibility	10mm OD tube (with suitable adapters)

Application: Hydraulic Oil Pressure Leak Test

Hydraulic Oil Service

RPTFE seat provides excellent compatibility with SAE 10 hydraulic oil. Zero leakage per API 598 ensures no oil loss during pressure leak testing. Rated for continuous operation at 100 bar and 90°C.

Fail-Safe Operation

Double acting actuator with spring return ensures the valve fails to CLOSED position on air supply loss. Critical for safety in high-pressure hydraulic test systems to prevent uncontrolled oil release.

PLC Integration

Dual solid-state proximity switches (24VDC) confirm valve open/closed position. Direct PLC integration for automated test sequences. NPN or PNP output available per your control system requirements.

Drop-in Replacement

Functionally equivalent to Assured Automation A26 series (A26NRXP8DC5BUB). Matching FNPT connection, actuator torque, fail-safe function, and feedback configuration for seamless replacement.

Test Pressure Requirements (API 598)

Test Type	Pressure	Medium	Standard
Hydrostatic Body Test	1.5x WP (150 bar)	Water	API 598
Hydrostatic Seat Test	1.1x WP (110 bar)	Water	API 598
Pneumatic Seat Test	6 bar (87 PSI)	Air / Nitrogen	API 598
Leakage Acceptance	ZERO LEAKAGE — No visible leakage permitted

Complete Assembly Includes

Ball Valve

1/4" 2-way, FNPT, RPTFE seat, full bore

Pneumatic Actuator

Dual scotch yoke, DA + spring return FC

Solenoid Valve

24VDC, 5/2 or 5/3 way directional

Position Feedback

2x solid-state proximity switches, 24VDC

Mounting Kit

Bracket, coupling, fasteners as per ISO 5211

Available in Other Sizes

1/4" (DN8)

Current page — 10mm line size

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3/8" (DN10)

Same specs — 12mm line size

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1/2" (DN15)

Same specs — larger flow capacity