YZN hydraulic snubbers are designed to allow slow thermal movement with low resistance, then restrain rapid displacement caused by a dynamic event. Catalogue data is used for RFQ screening; the project load, stroke, connections and installation geometry control final selection.
YZN SERIES CATALOGUE REFERENCE / PROJECT SELECTION
Hydraulic snubber terminology
YZN hydraulic snubbers allow slow thermal movement and restrain rapid displacement in piping systems. Damper is a broader term: it does not establish that a device has the same operating principle or is interchangeable with a pipe snubber. This page describes the YZN hydraulic snubber range, not mechanical snubbers or a separate range of viscous dampers.
What a hydraulic snubber does
A valve-controlled hydraulic piston permits fluid transfer during slow movement, helping the attached piping or equipment follow normal thermal displacement. When piston speed rises above the set lockup threshold, the hydraulic path closes and the unit develops restraint force that transfers the dynamic load to the supporting structure.
Typical design cases can include water hammer, steam hammer, fast valve closure, seismic action, wind load or impact. The required event, load case, stroke and attachment geometry must come from the project analysis or controlling drawing; a catalogue range is not a substitute for that input.
Terminology boundary: this page uses hydraulic snubber as the primary product term. ASME OM describes snubbers as dynamic restraints, while some procurement files use hydraulic damper more broadly. The two terms should not be assumed interchangeable until the required function is checked. This page does not claim ASME certification or nuclear qualification.
YZN model designation
Code block
Meaning in the 2026 catalogue
RFQ control
YZN
Hydraulic snubber family
Confirm required dynamic-restraint function
S / D
Vibration / safety-valve discharge function code
Select only from project duty and drawing
100
Example bore size, mm
Do not select from pipe size alone
150
Example stroke, mm
Check movement envelope and installation allowance
W
With extension rod
Confirm installed length and connection arrangement
Example designation: YZN-S-100x150-W. Final coding follows the approved project selection.
Catalogue load and connection reference
Bore
Catalogue normal load
Pin diameter
25 mm
5 kN
10 mm
32 mm
10 kN
12 mm
40 mm
16 kN
15 mm
63 mm
48 kN
25 mm
80 mm
80 kN
35 mm
100 mm
120 kN
40 mm
125 mm
200 kN
50 mm
160 mm
320 kN
60 mm
200 mm
500 kN
80 mm
250 mm
1000 kN
100 mm
PipeAnchor YZN Catalogue 2026, Rev. 01. C25 and C250 dimensional arrangements are project-specific; all loads, strokes and connections require RFQ confirmation.
Catalogue boundary: the catalogue lists a 25-250 mm bore range and 120-360 mm/min lockup velocity. The dimension schedules include 100, 150, 200, 300 and 400 mm stroke rows for selected bore groups. Do not interpolate a production model from this summary; final dimensions, normal load, stroke, lockup setting, materials, coating, testing and documentation are confirmed against the RFQ and drawings.
Available configuration routes
Compact
Eye-to-eye body
Compact configuration with spherical-eye connections at both ends. Installation length, pin size and articulation are checked against the support steel and piping attachment.
Extension rod
Length-adjustable layout
Extension-rod configuration for longer installation envelopes. The required stroke allowance remains separate from installation-length adjustment.
Flanged extension
Project connection interface
Flanged extension arrangement where the approved project connection requires it. Flange, fastener and interface details stay drawing-controlled.
RFQ inputs that control selection
Input
Why it matters
If missing
Required function / dynamic event
Defines what the restraint is expected to react against
Keep model selection open
Normal load and governing load case
Controls the catalogue group and attachment loads
Do not infer from pipe diameter
Required stroke and movement direction
Controls body and rod travel allowance
Request stress-analysis output
Cold installation length
Controls compact or extension arrangement
Request dimensioned field or drawing record
Orientation and connection details
Controls pin bracket, eye and structural interface
Request marked-up support detail
Service environment
Controls materials, sealing, coating and inspection scope
Keep finish and seal arrangement TBC
Testing and documentation requirements
Controls inspection plan, records and witness points
Do not assume certification or report scope
Minimum intake for a reviewable hydraulic-snubber quotation request.
Factory and field evidence
The photographs below document finished cylindrical units, a damping device in a factory test rig and an anonymized field installation. They support product-family and manufacturing-experience statements only; they do not prove the model, load, test result or project qualification of a particular RFQ.
REAL FACTORY PHOTO — FINISHED UNITSREAL FACTORY PHOTO — TEST RIG CONTEXTREAL FIELD PHOTO — ANONYMIZED INSTALLATION
Verify attachment points, installation length, model, pin size, interfaces and drawing requirements before installation.
Keep the unit clear of structural interference, impact and welding spatter.
Control bracket-welding distortion so the pin alignment is maintained.
At maximum thermal displacement, keep the snubber and pin-bracket axes within the project-approved articulation; the catalogue reference is 6 degrees maximum and no bending moment.
For extension-rod models, retain the required stroke allowance when setting the installed length and lock arrangement.
Frequently asked questions
What is the difference between a hydraulic snubber and a damper?
This YZN product family is a hydraulic snubber: it is intended to permit slow thermal displacement with low resistance and restrain rapid displacement above its velocity setting. Some RFQs use hydraulic damper as a broader or informal term, but dampers and snubbers should not be treated as interchangeable without checking the required function.
What information is needed to select a hydraulic snubber?
Provide the required function, normal load, stroke, installation length, orientation, connection and pin details, service environment, piping displacement information and the controlling drawings. Final model and dimensions are confirmed against that project input.
What load range is shown in the YZN catalogue?
The 2026 YZN catalogue lists normal loads from 5 to 1000 kN across bore sizes from 25 to 250 mm. These are catalogue reference values, not an automatic selection or project-specific capacity confirmation.
Does this page claim nuclear qualification or ASME certification?
No. ASME OM uses the industry category dynamic restraints (snubbers), but this page does not claim ASME certification, nuclear qualification or a project test result. Certification, testing and documentation scope must be confirmed before quotation.
Need a hydraulic snubber reviewed?
Send the load case, stroke, installed length, connection detail, environment and drawings for project selection.
