Description

TECHNICAL DATA SHEET

Product Name: 1/2-inch 300LB Y-Pattern Pneumatic Diaphragm Actuated Globe Valve
Model/Specification: 1/2″-300LB-Y-PNEUMATIC-DIAPHRAGM-GLOBE
Valve Type: Y-Pattern Globe Valve with Pneumatic Diaphragm Actuator
Connection Type: Threaded (NPT) / Socket Weld (SW) / Butt Weld (BW) User specified

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1. Basic Design Parameters

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2. Technical Specifications

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3. Pneumatic Diaphragm Actuator Specifications

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4. Material of Construction (Recommended – Stainless Steel)

*For Carbon Steel version (A105): body/bonnet to A105, bolting to A193 B7 / A194 2H.*

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5. Main Dimensions & Connection Details

*Note: Dimensions for 1/2″ Class 300 Y-Pattern Globe Valve with NPT ends. Based on industry standards.*

5.1 Valve Body Dimensions (Face-to-Face – Threaded)

*Note: H(open) includes actuator height. Valve body weight approx 0.8 kg, actuator adds additional 0.7-1.0 kg.*

5.2 End Preparation Details (Per ASME Standards)

5.3 Y-Pattern Design Advantage

• Stem Angle: 45° to flow path

• Flow Coefficient: 30-50% higher than equivalent straight pattern globe valve

• Pressure Drop: Significantly reduced compared to standard globe valves

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6. Pressure-Temperature Rating (ASME B16.34 / Class 300)

*Material Group: Stainless Steel (A182 F304/F316)*

For Carbon Steel (A105): similar ratings up to 425°C with derating.

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7. Flow Characteristics (1/2″ – Class 300 Y-Pattern)

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8. Test Pressure (API 598)

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9. Diaphragm Actuator Selection Guide (1/2″ Valve)

Note: Diaphragm actuator provides proportional control with high positioning accuracy. Multi-spring design reduces overall height and weight.

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10. Diaphragm Actuator Advantages for This Valve

• High Positioning Accuracy: Ideal for modulating control applications requiring precise flow regulation

• Low Friction: Rolling diaphragm design minimizes hysteresis

• Fail-Safe Operation: Springs provide reliable fail-open or fail-closed action on air loss

• Compact Design: Multi-spring construction reduces actuator height

• Interchangeable Springs: Easy range changes in the field

• Corrosion Resistance: Epoxy-coated aluminum housing standard

• Low Air Consumption: Efficient diaphragm design reduces operating costs

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11. Features & Applications

• Key Features:

  • Y-Pattern Design: 45° stem angle provides straighter flow path, resulting in lower pressure drop and higher Cv compared to straight pattern globe valves .

  • Pneumatic Diaphragm Actuator: Provides precise modulating control with high positioning accuracy and low hysteresis .

  • Compact Size (1/2″): Ideal for small bore piping systems and instrument connections .

  • Excellent Throttling Control: Y-pattern globe design provides precise flow regulation with reduced turbulence .

  • Forged Body Construction: Provides superior strength and reliability compared to cast valves .

  • Flexible Configuration: Direct-acting (air-to-close) or reverse-acting (air-to-open) options .

  • Manual Override: Optional handwheel allows manual operation during air supply failure .

  • Versatile Material Options: Carbon steel or stainless steel for various services .

  • Multiple Seat Options: Metal seats for high temperature, soft seats for zero leakage .

  • Reduced Pressure Drop: Ideal for applications where pressure loss must be minimized .

  • Fail-Safe Operation: Spring-return diaphragm actuator ensures safe position on air failure .

  • Low Maintenance: Rolling diaphragm design requires minimal maintenance .

• Main Applications:

  • Steam Systems: Modulating control in steam tracer lines and small bore steam distribution .

  • Chemical Injection: Precise metering and control of chemical additives .

  • Sampling Systems: Accurate control for process sampling points .

  • Instrument Air Lines: Precise control of air supply to instruments .

  • Boiler Blowdown: Small bore blowdown and drain applications .

  • Laboratory & Pilot Plants: Precise flow control in research settings .

  • HVAC Systems: Modulating control of heating and cooling media .

  • Water Treatment: Chemical dosing and flow control .

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12. Y-Pattern vs. Straight Pattern Comparison

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13. Ordering Information

Please specify when ordering:

1. Valve size: 1/2″ (DN15)

2. Pressure class: 300LB

3. Body material: A105 / F304 / F316

4. End connections: NPT / SW / BW

5. Seat type: Metal / Soft (PEEK/PTFE)

6. Actuator action: Direct Acting (Air-to-Close) / Reverse Acting (Air-to-Open)

7. Spring range: 0.2-1.0 bar / 0.4-2.0 bar / 0.8-2.4 bar / Custom

8. Control type: On-Off (with solenoid) / Modulating (with 4-20mA positioner)

9. Diaphragm material: NBR / EPDM / Viton®

10. Accessories: Positioner, solenoid valve, limit switches, air filter regulator, manual override, volume booster

11. Special requirements: Fire-safe, NACE, oxygen cleaning, cryogenic service, low temperature, etc.

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*Disclaimer: The above data is prepared based on common industry standards (ASME B16.34, API 598, API 602) for Y-pattern pneumatic diaphragm actuated globe valves . The multi-spring diaphragm actuator provides superior modulating control compared to piston actuators for this size range. Specific dimensions, materials, and actuator sizing may vary by manufacturer based on actual pressure and temperature conditions. The final technical agreement and certified drawings shall prevail.*