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
Identifies the required restraint function and project duty before selecting a function code
Keep the function code and model selection open
Normal load and governing load case
Identifies the required normal load, units and controlling project reference
Mark the load to be confirmed; do not infer it from pipe diameter or a photograph
Required stroke and movement direction
Connects the required travel to the displacement information and controlling drawing
Request the displacement or drawing record; keep selection open
Installation length and condition
Identifies the required installation dimension and the condition to which it applies
Request the controlling dimension and condition before fixing the arrangement
Orientation and configuration
Identifies installation orientation and the required compact or extension-rod arrangement
Confirm the arrangement before fixing the model designation
Connections and pins
Identifies connection interfaces, pin details and the drawing reference; one catalogue pin diameter does not establish interface compatibility
Request the connection drawing and required pin details
Service environment
Records the service and environmental requirements specified by the project
List the missing conditions explicitly for confirmation
Materials, coating, testing and documents
Identifies the required specifications, inspection scope and documents for quotation review
Confirm the scope before quotation; do not assume an unlisted material, qualification or report
Controlled project reference
Connects the RFQ and equipment tag to the controlling drawing number and revision
Keep unresolved fields attached to that RFQ/tag; request the drawing number and revision
Minimum intake for a reviewable hydraulic-snubber quotation request.
Reference: PipeAnchor YZN Catalogue 2026, Rev. 01, pages 1, 2 and 6. These enquiry fields organize the project information needed for quotation review; they are not installation instructions or a completed engineering selection. Mark unavailable inputs as to be confirmed and retain their RFQ/tag and drawing revision references until resolved.
A catalogue reference is not a unit-specific test record
Catalogue data describes a product-family reference. A test-equipment photograph shows equipment in a particular setting. Neither, by itself, identifies the measured response of the hydraulic snubber proposed for a specific project.
When test documentation is part of the enquiry, ask what unit or support tag the proposed record will identify, which configuration and settings it covers, and which method and acceptance criteria the project requires. Keep the requested criteria separate from any actual results. If a result is supplied, confirm that its identity and revision correspond to the unit being reviewed.
For example, a catalogue velocity range and a photograph of a test rig do not establish a selected unit's measured lockup response. Leave that evidence field open until an applicable record is available. This is a purchasing-review question set, not a test procedure or a claim that a particular report or qualification is included.
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.
