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Flow Meter Fittings Guide: High-Pressure Compression Adapters for Hydraulic Sensors
Quick Answer: This flow meter fittings guide covers high pressure compression adapters that connect hydraulic sensors to process lines without welding. Silver Automation Instruments supplies 316L stainless steel adapters rated from 100 bar to 420 bar for 1/4 NPT, 1/2 NPT, G1/4, and 1/2 BSPP sensor threads. Send us your pressure in bar, temperature in degrees Celsius, pipe size DN, and thread type for a same day recommendation.
What These Adapters Do
A compression adapter creates a metal to metal seal between the hydraulic sensor and the process connection. The adapter body threads into a port or impulse line. The sensor then threads into the adapter and seals on a cone seat at the sensor nose. This method avoids welded nipples and lets maintenance teams replace a hydraulic sensor in minutes. In practice, thread fit and seat angle matter more than the fitting brand.
Pressure Ratings And Material Selection
Silver Instruments rates the standard adapter series to 420 bar at 20 degrees Celsius. Test pressure is 1.5 times the rated pressure. Burst pressure is above 1200 bar for 316L versions up to 1/2 inch. For 690 bar systems we quote a heavy wall version with autoclave style threads.
Material choice depends on the fluid. 316L stainless steel is the default for hydraulic oil, water, air, and nitrogen. Hastelloy C276 covers seawater, chlorinated water, and weak acids. Super Duplex covers high chloride process water in desalination and offshore utility lines. The standard adapter with a metal cone seal works from -40 degrees Celsius to 120 degrees Celsius. PTFE tape on the compression cone will not work above 100 bar.
Thread Sizes That Cover Most Hydraulic Sensor Installations
Most hydraulic pressure sensors use 1/4 NPT, G1/4, or 1/2 BSPP male threads. The process side is often 1/2 NPT female, 3/4 BSPP female, or a 15 mm to 20 mm welded stub. For a sensor with G1/4 male and a process port with 1/2 NPT female, the part number is SI-ADC-G14-N12-316. For a sensor with 1/4 NPT male and a 1/2 BSPP female port, the part number is SI-ADC-N14-B12-316.
Do not assume the thread by looking at the outside diameter. NPT and BSPP threads can feel similar but the pitch angle is different. That mistake leaks at high pressure. Send us a photo of the sensor thread next to a caliper if you are not sure. Some European pressure transmitters use M12 x 1.5 or M20 x 1.5 threads. Silver Instruments keeps adapters for M12 and M20 sensor threads in 250 bar and 420 bar classes.
Where We See These Adapters Used
A hydraulic test rig builder in Malaysia ordered 40 adapters last year. Their pump skids run at 350 bar and use 1/4 NPT sensors. The process ports are 1/2 NPT female. They returned after six months to order another 50 adapters and a spare seal kit. The main issue they solved was a slow leak at the sensor base after thermal cycli
A desalination plant in Oman replaced welded stubs on high pressure reverse osmosis reject lines. The process pressure was 70 bar and the fluid was warm seawater with a chloride level of 19000 mg/L. They used 1/2 BSPP pressure transmitters with 4-20 mA HART output. We supplied 20 adapters in Hastelloy C276. After 14 months the site reported zero leaks and no crevice corrosion.
Installation Steps That Prevent High Pressure Leaks
Step one. Decompress the line and verify zero pressure at the gauge. Step two. Remove the old fitting and inspect the cone seat under a bright light. Step three. Clean the thread and cone with solvent. Step four. Lubricate the thread lightly but keep the cone dry. Step five. Thread the adapter by hand until it stops. Step six. Tighten with a torque wrench. Use 25 to 35 Nm for 1/4 inch adapters and 50 to 65 Nm for 1/2 inch adapters. Step seven. Pressurize in three steps and check with leak detection spray. Most leaks we see come from over tightening, mixed NPT and BSPP threads, or metal debris in the seat.
What To Send Us For A Quote
Send us your pressure in bar, temperature in degrees Celsius, pipe size in DN, and flow range. Include the sensor thread and process connection thread. Also tell us the fluid and chloride level if the application is seawater or chemical. We reply with a part number, drawing, price, and lead time. For urgent replacements we can ship from stock to Southeast Asia, Oceania, the Middle East, and Africa in three to five working days.
Contact Silver Automation Instruments.
Tel: +86-135-1213-1526
WhatsApp: 86-135-12131526
WeChat: +86 13512131526
FAQ
What is the maximum pressure rating of Silver Instruments compression adapters?
Answer. The standard series is rated to 420 bar. For 690 bar systems we quote a heavy wall autoclave style version. Burst pressure is above 1200 bar for 316L sizes up to 1/2 inch.
Can these fittings work with 4-20 mA HART pressure sensors?
Answer. Yes. The adapter is a mechanical component. It does not care about the electrical output. We only need the sensor thread, process connection, and pressure range.
Do you supply adapters for seawater or corrosive fluids?
Answer. Yes. We supply 316L stainless steel for mild corrosion and Hastelloy C276 or Super Duplex for seawater, chlorinated water, and weak acid service. Send us the chloride level in mg/L and temperature for a correct material recommendation.
What thread sizes are available from stock?
Answer. We stock 1/4 NPT, 1/2 NPT, G1/4, G1/2, 1/2 BSPP, M12 x 1.5, and M20 x 1.5. Special threads like UNF 7/16-20 for refrigerants are available on request.
How do I order the correct adapter?
Answer. Send us the sensor thread, process connection, pressure in bar, temperature in degrees Celsius, and fluid. We will reply with a part number, price, and stock availability within one working day.
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