Frequently Asked Questions (FAQs) about Gauge Valves & Gauges
What are gauge valves used for in industrial refrigeration?
Gauge valves serve as isolation valves that allow pressure gauges to be safely installed, removed, or replaced without refrigerant loss or system shutdown. In industrial refrigeration systems, gauge valves like Hansen's angle models provide critical points for pressure monitoring while ensuring system integrity and operational safety during maintenance procedures.
What types of Hansen gauge valves are available?
Our inventory features Hansen Technologies' complete line of gauge valves, including standard angle configurations with various connection combinations (MPT x FPT, FPT x FPT, Butt Weld x FPT), available in 1/4", 3/8", and 1/2" sizes. These valves come with stainless steel stems and your choice of seal caps (SC) or bar handles for operational flexibility.
How do I choose between seal cap and bar handle gauge valves?
Hansen gauge valves with seal caps (SC) provide maximum leak protection and tamper resistance, making them ideal for critical monitoring points where unauthorized adjustment is a concern. Bar handle models offer easier access for frequent operations, perfect for points requiring regular readings or adjustments. Consider your operational requirements and safety protocols when selecting between these options.
What's the difference between standard and long neck gauge valves?
Standard Hansen gauge valves are compact and economical, while long neck models (like Hansen's Long Neck Gauge Valve, 1/4" MPT x FPT) provide additional clearance from insulation and improved access in tight spaces. Long neck versions are particularly valuable in heavily insulated systems or where gauges need to be positioned away from cold surfaces to prevent condensation issues.
What NH3 gauge options does Hansen offer?
Hansen provides a comprehensive range of NH3 (ammonia) gauges with varying pressure ranges (30-150 PSIG, 30-300 PSIG, 30-350 PSIG) and metric equivalents (1-11 Bar, 1-21 Bar). Available in 3.5" (90mm) and 4" (100mm) diameters, with standard or stainless steel construction, these gauges are specifically calibrated for accurate ammonia refrigeration system monitoring.
How do temperature pressure gauges differ from standard pressure gauges?
Hansen's NH3 Temperature Pressure Gauges display both pressure readings and corresponding ammonia saturation temperatures on a single dial, eliminating the need for conversion charts. These specialized gauges (like the Hansen NH3 Temperature Pressure Gauge 30 to 300 PSIG) are particularly valuable for quick system assessment and troubleshooting by showing both critical parameters simultaneously.
What maintenance is required for gauge valves and gauges?
Regular inspection for leaks, proper operation of valve stems, and gauge accuracy is recommended. Hansen's stainless steel stem gauge valves resist corrosion and require minimal maintenance. Gauges should be periodically checked against calibrated reference gauges and replaced if readings drift beyond acceptable tolerances, typically every 3-5 years depending on system vibration and pressure cycling.
Are Hansen stainless steel gauges worth the higher investment?
Hansen's stainless steel gauges (like the NH3 Gauge 30-150 PSI 4" Diameter Stainless Steel) offer superior corrosion resistance and longer service life in harsh environments. The stainless construction prevents case degradation from exposure to ammonia, moisture, or harsh cleaning chemicals. While representing a higher initial cost compared to standard gauges, their extended service life and reliability make them economical for critical monitoring points.
How do I select the right pressure range for my refrigeration gauges?
Select gauges with pressure ranges where your normal operating pressure falls in the middle third of the scale for optimal accuracy and readability. For ammonia low-side monitoring, 30-150 PSIG gauges are typically appropriate, while high-side applications generally require 30-300 PSIG or 30-350 PSIG ranges. Using properly ranged gauges ensures the best resolution and avoids damage from pressure spikes.
What is a transducer valve and when would I need one?
Hansen's transducer valves (like the 1/4" Transducer Valve, Angle, MPT x FPT) are specialized gauge valves designed to accommodate electronic pressure transducers used in automated control systems. These valves feature specific threading and sealing arrangements optimized for electronic sensors. You would need transducer valves when implementing digital pressure monitoring, automated controls, or remote monitoring capabilities in your refrigeration system.
