ตัวแทนจำหน่าย Fisher by Emerson 289 Series | Relief Valves or Back pressure Regulators ในประเทศไทย
Designed for reliable overpressure protection, the Fisher 289 Series relief valve is installed downstream of pressure regulators to safeguard downstream systems. Its smooth, throttling action minimizes pressure surges during emergency operations.
Product Overview
• Throttling-style relief mechanism designed to prevent abrupt system pressure spikes.
• Available in 1/4", 3/4", 1", and 2" นิ้ว NPT connections.
• Relief pressure settings range from 5 in. w.c. (12 mbar) to 75 psig (5.2 bar).
Performance Features
Pitot Tube Booster (available in sizes above ¼"):
• When the valve opens, high-velocity gas induces a partial vacuum at the end of the pitot tube. This vacuum pulls open the valve diaphragm more effectively—enabling high flow capacity with minimal pressure increase.
Sensitive Diaphragm Seal:
• The relief valve diaphragm serves as the sealing disk in all models except for Types 289H and 289HH, which use O-ring seats. Soft sealing surfaces made of Nitrile (NBR) or Neoprene (CR) ensure bubble-tight shutoff.
Ideal for Low-Pressure Settings:
• Large diaphragm area improves sensitivity and response at lower pressure thresholds.
Benefits
Throttling Relief Action:
• Smooth and controlled venting to minimize system disturbance.
High Flow Capacity:
• Boosting effect delivers maximal relief with minimal pressure buildup.
Compact Size:
• Small footprint suits installations where space is limited.
Simple & Dependable:
• One-piece construction simplifies maintenance and reduces the risk of mechanical failure.
Hydrogen Service Ready:
• Materials evaluated and approved for hydrogen service, including compatibility and resistance to hydrogen embrittlement.
Specifications
Body Sizes and End Connection Styles
• Types 289A and 289U: 1/4 NPT
• Type 289H: 1/2 NPT
• Type 289HH: 1 NPT
• Type 289L: 3/4, 1 NPT
• Type 289U: 1/4 NPT
Maximum Allowable Relief (Inlet) Pressure
• 100 psig / 6.9 bar
Relief Set Pressure Ranges (5 models)
• 5wc to 50 psig / 25mbar to 3.5 bar
Pressure Registration
• Internal
Temperature Capabilities
• Nitrile (NBR) and Neoprene (CR) Elastomers: -20 to 150°F / -29 to 66°C Fluorocarbon (FKM): 20 to 300°F / -7 to 149°C
• Available with Types 289H and 289HH only
Approximate Weights
• Type 289A and 289U: 0.75 Pounds / 0.3 kg
• Type 289H: 1 NPT - 4 Pounds / 2 kg, 2 NPT - 15 Pounds / 7 kg
• Type 289HH: 4 Pounds / 2 kg
• Type 289L: 15 Pounds / 7 kg
289H: Relief Adjustment Ranges
• 0.5 to 2.25 psig / 34 to 155 mbar
289H: Maximum Relief (Inlet) Pressure
• 25 psig / 1.7 bar
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