Pneumatic Globe Control Valve With Intelligent Positioner

Pneumatic Single-Seated Globe Control Valve with Intelligent Positioner

OVERVIEW

The Pneumatic Single-Seated Globe Control Valve with Intelligent Positioner is an advanced fluid control system engineered and manufactured by Tianjin Freya Automation Technology Co., Ltd. (FRY). Combining a heavy-duty S-streamlined cast globe valve body, a top-guided balanced cage plunger plug, a high-thrust multi-spring pneumatic diaphragm actuator, and the L8A-100 series intelligent electro-pneumatic digital positioner, it delivers world-class throttling accuracy, high flow capacity, and reliable shutoff performance across demanding industrial environments.

Featuring a streamlined S-shaped internal flow passage that minimizes pressure drop loss and fluid turbulence, this control valve integrates multi-stage pressure reduction, cavitation suppression, and aerodynamic noise control technologies. Equipped with the L8A-100 smart digital positioner providing two-wire 4-20mA analog control, local LCD digital display, zero/span auto-tuning, and intrinsic safety certification (Ex ia IIC T6), it is widely utilized across petroleum, natural gas, refining, chemicals, thermal power generation, pharmaceuticals, metallurgy, papermaking, and environmental water treatment automation systems.

FEATURES OF PNEUMATIC CONTROL VALVES

1. Streamlined S-type flow passage: Advanced fluid channel geometry minimizes pressure loss, maximizes rated flow coefficient (Cv), and reduces turbulence;

2. Top-guided heavy-duty cage structure: High mechanical rigidity and large guide surface prevent plug vibration, stem bending, and lateral wear under high pressure differentials;

3. Quick-change clamped seat design: Press-fit seat structure allows rapid field maintenance and trim replacement without cutting the valve from the pipeline;

4. Multi-spring compact diaphragm actuator: Low-profile multi-spring design provides high output thrust, rapid dynamic response, low hysteresis, and reduced installation height;

5. L8A-100 intelligent digital positioner: Microprocessor-driven electro-pneumatic positioner features LCD screen, automatic calibration, and precise 4-20mA positioning;

6. High positioning accuracy: Achieves linearity ≤ ±1.0% F.S., sensitivity ≤ ±0.2% F.S. (single-acting), and repeatability ≤ ±0.5% F.S. for tight closed-loop control;

7. Ultra-low air consumption & fast delivery: Steady-state air consumption only 3 LPM (at 20 psi), with high pilot air delivery up to 80 LPM for rapid valve stroking;

8. Intrinsic safety explosion-proof rating: Certified Ex ia IIC T6 and IP65 enclosure protection, ensuring safe operation in hazardous explosive chemical zones;

9. Flexible Direct / Reverse acting modes: Positive action (Air-to-Close) and reaction (Air-to-Open) can be conveniently configured on-site to satisfy fail-safe requirements;

10. High-performance live-loaded packing: PTFE V-rings and flexible graphite packing with Belleville disc springs ensure long-term maintenance-free stem sealing with zero fugitive emissions;

11. Multiple sealing classes: Precision metal-to-metal seat meets ANSI Class IV / V shutoff, and optional soft PTFE/RTFE seat achieves bubble-tight ANSI Class VI leakage rate;

12. Broad operating temperature range: Standard bonnet (-20℃~+200℃), radiator finned bonnet (+250℃~+550℃), and cryogenic extension bonnet (-196℃~-40℃);

13. Anti-cavitation and aerodynamic noise trim: Specialized multi-hole cage and multi-stage pressure drop trims eliminate cavitation erosion and reduce operational noise;

14. Two-wire 4-20mA DC position feedback: Continuous real-time analog output signal transmits actual valve travel to DCS/PLC without external position transmitters;

15. Emergency top handwheel override: Top-mounted manual handwheel enables smooth manual emergency valve positioning during electrical loop or air supply interruptions;

16. Universal standard compliance: Face-to-face dimensions strictly comply with IEC 60534, and flange ratings conform to ASME B16.5, EN 1092-1, and GB/T 9113.

PRODUCT ADVANTAGES

Diversified needs

To satisfy rigorous requirements across high-temperature steam lines, cryogenic LNG pipelines, corrosive chemical reagents, and high-pressure gas regulation, the control valve series provides diverse body materials (WCB, LCB, CF8, CF8M, CF3M), pressure ratings (PN16 to PN64, Class 150 to 300 LB), and custom trims (standard, balanced cage, multi-hole noise reduction, cavitation suppression).

Superior performance

Quality Assurance

Every control valve unit undergoes 100% hydrostatic shell pressure testing, seat leakage calibration, full-stroke hysteresis & linearity verification, and cryogenic/high-temperature seal checks before dispatch, ensuring defect-free performance in continuous industrial operations.

Long warranty period

MAIN FUNCTIONS

Explosion Proof

L8A-100 intelligent positioner is certified intrinsically safe Ex ia IIC T6 under GB 3836 / IECEx standards, suitable for Zone 0, Zone 1, and Zone 2 hazardous explosive atmospheres.

Colors

Standard industrial finish combines high-visibility yellow pneumatic diaphragm housing, red die-cast aluminum smart positioner cover, and anti-corrosive gray epoxy-coated cast valve body.

Protection grade

Intelligent positioner enclosure meets IP65 ingress protection; pneumatic diaphragm actuator enclosure meets IP66/IP67, resisting severe outdoor moisture, dust, and corrosive industrial atmospheres.

Low-temperature

Standard ambient operating range is -20°C to +60°C. With deep cryogenic extension bonnet and low-temperature elastomeric seals, the valve reliably handles cryogenic liquid nitrogen and LNG down to -196°C.

Electric Actuator Technical Data

Table 1: Top-Guided Pneumatic Single-Seated Globe Control Valve Technical Parameters

Table 2: L8A-100 Series Intelligent Electro-Pneumatic Valve Positioner Specifications

Table 3: Multi-Spring Linear Pneumatic Diaphragm Actuator Specification Parameters

Table 4: Valve Body & Internal Trim Material Configuration Standards

Table 5: Rated Flow Coefficient (Cv) & Allowable Differential Pressure Specifications

COMPANY INTRODUCTION

Founded in 2014, Tianjin Freya Automation Technology Co., Ltd. (Freya) is a premier high-tech enterprise dedicated to the research, development, manufacturing, and global supply of intelligent control valves, pneumatic diaphragm control valves, electric actuator valves, and smart valve positioners. With modern precision machining facilities, rigorous quality management, and advanced flow testing laboratories, Freya provides robust fluid control engineering solutions to global industrial clients in petroleum, petrochemicals, power utilities, pharmaceuticals, environmental engineering, and municipal water networks.

Adhering to strict international quality standards, Freya integrates high-precision casting technology, aerodynamic S-streamline flow design, low-leakage gland sealing, and intelligent microprocessor controls to ensure superior throttling stability and long-term reliability in critical process automation pipelines.

APPLICATIONS

CERTIFICATES

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