- Female: G1/2, M20 x 1,5
- Male thread: G1/2, M20 x 1,5
- PN in bar: 250, 400
- Material: Brass, Steel, CrNi-Steel
 Datasheet
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Pressure Snubber for Gauges – Pulsation Damping & Measurement Protection
Pressure snubbers protect mechanical and digital pressure gauges against pulsation, shocks and cavitation. By introducing a defined restriction (sintered element, capillary, needle), the pressure dynamics are smoothed—readings stay stable, the service life of Bourdon tube/sensor increases and overload damage is reduced.
Available in brass and stainless steel 316(L) for media such as air, water, hydraulic oil, steam (use with cooling element/siphon), gases and chemical fluids. Threads include G 1/4, G 1/2 (BSPP), 1/4″ / 1/2″ NPT, and M20×1.5. On request, we supply pre-assembled sets with gauge cock, cooling element, overpressure protection and gauge.
FAQ on Pressure Snubbers for Gauges
Selection, sizing, installation, maintenance and best practices for calm displays and robust measuring points.
Which types of snubbers are available?
| Type | Principle | Benefits | Typical media |
|---|---|---|---|
| Sintered element | Porous restrictor, fixed orifice | Compact, cost-effective | Air, water, clean oils |
| Capillary bore | Long, fine bore | Consistent damping | Gases/liquids with slight particulates |
| Needle valve | Continuously adjustable restriction | Tunable, service-friendly | Hydraulics, compressors, presses |
| Oil-filled damper | Hydraulic damping chamber | Very stable indication | Strong pulsation/shock |
How do I choose the right snubber for my process?
Base your choice on medium, viscosity, particle load and pulsation frequency. For clean gases/liquids, sintered/capillary types often suffice. With changing conditions or unknown dynamics at commissioning, a tunable needle snubber is recommended.
Does a snubber affect accuracy?
In the steady state, hardly—its effect is mainly dynamic smoothing. Excessive restriction can lengthen the response time; set damping so the display is stable yet sufficiently responsive.
Where should the snubber be installed?
As close to the process as possible and upstream of the gauge/overpressure protection/cooling element. Typical chain: Process → Shut-off valve/gauge cock → Snubber → Cooling element/siphon (for hot media) → Overpressure protection → Gauge.
Which thread and sealing concepts are common?
| Thread | Standard | Sealing | Note |
|---|---|---|---|
| G 1/4, G 1/2 (BSPP) | ISO 228 (parallel) | Flat gasket/O-ring at seat | Keep faces clean and flat |
| 1/4″, 1/2″ NPT | ASME B1.20.1 (taper) | PTFE tape/paste | Wrap in thread direction |
| M20×1.5 | ISO metric | Usually flat gasket | Verify seat geometry |
How do I adjust a needle-type snubber?
- Close the valve, then slowly open until the indication is calm but not sluggish.
- Fine-tune under real operating conditions; freedom from flutter has priority.
- Document the setting (turn position/mark).
Can a snubber clog?
Yes—especially sintered/capillary types with particulates/crystallization. Mitigation: install a filter upstream, use adjustable needle types, or plan regular cleaning/replacement.
What media and temperature limits apply?
According to material/seal. Brass for neutral media; 316(L) for corrosive/hygienic service. For steam/hot media, add a cooling element/siphon.
Common mistakes—and how to avoid them
- Too little damping → pointer flutter: increase restriction/use adjustable type.
- Too much damping → sluggish reading: reduce restriction.
- Wrong sealing concept (BSPP/NPT) → leaks: verify thread standard.
- Installed too far from the process → reduced effect: place snubber close to the source.
Does a snubber replace overpressure protection?
No. It damps dynamics but does not limit sustained overpressure. If overload is possible, add an overpressure protection device.
How often should it be serviced?
Depends on duty: for pulsating/contaminated media, check at least annually, clean/replace the sintered/capillary element, keep needle valves operable, and perform a leak test.
Does it reduce vibration as well?
It damps pressure pulsation, not mechanical vibration. For vibration, use glycerin-filled gauges or mechanical decoupling in addition.
Does ICS Schneider offer pre-assembled solutions?
Yes—e.g., gauge cock + snubber + cooling element + overpressure protection + gauge, including gaskets and, on request, EN 10204 3.1 and pressure/leak test reports.