WILDEN / Surge Dampener

WILDEN 71-7557 SD2 · Aluminum · Wilden® Equalizer® Surge Dampener SD Series creates l…

WILDEN item number 71-7557

Part type: Surge Dampener
Material: Aluminum
Model / configuration: SD2
Part function: Wilden® Equalizer® Surge Dampener SD Series creates laminar process flow by reducing and/or eliminating pump pulsation. SD Equalizers do this by using the same air supply as the pump to counter the pressure changes within the system. When installed properly using the same air supply as the pump, SD Equalizers equalize the correct air pressure to match variations in liquid flow or discharge pressure. SD Equalizers are also ATEX compliant. Meets ATEX II 2 GD X requirements Lowers system maintenance costs Protects in-line equipment Self-adjusts to varying system pressure

Match the complete pump model and revision before ordering a replacement.

PRODUCT OVERVIEW

Part identification

WILDEN 71-7557 is identified as Wilden® Equalizer® Surge Dampener SD Series creates laminar process flow by reducing and/or eliminating pump pulsation. SD Equalizers do this by using the same air supply as the p…. The recorded material is Aluminum. This page is structured for part identification, maintenance planning and RFQ review.

TECHNICAL DATA

Technical parameters

WILDEN item number	71-7557
Model / configuration	SD2
Part type	Surge Dampener
Part function	Wilden® Equalizer® Surge Dampener SD Series creates laminar process flow by reducing and/or eliminating pump pulsation. SD Equalizers do this by using the same air supply as the pump to counter the pressure changes within the system. When installed properly using the same air su…
Material	Aluminum
Purpose / application	Wilden® Equalizer® Surge Dampener SD Series creates laminar process flow by reducing and/or eliminating pump pulsation. SD Equalizers do this by using the same air supply as the pump to counter the pressure changes within the system. When installed properly using the same air su…
Technical identification	Wilden 2" Surge Dampener, Aluminum NPT Santoprene® Elastomers
Related WILDEN item numbers	04-6090-08, 08-1010-58, 08-3210-55-225, 08-3660-01, 08-3700-01, 08-4550-01, 08-5000-01, 08-6050-08, 08-6120-08, 71-1281-55, 04-3529-56, 04-6420-08, 08-6450-08

Compatibility and code verification

Match the complete pump model, generation, size, air distribution system, wetted material and elastomer before ordering. Similar-looking components may not be interchangeable.

Materials

Review the body, diaphragms, balls, seats, seals and process-fluid compatibility as a complete system. Do not approve a material from one component alone.

Performance

Part performance and service life depend on the correct pump generation, operating pressure, fluid compatibility, assembly condition and maintenance procedure.

Suitable operating duties

Typical duties include chemical transfer, process circulation, tank unloading, coatings, wastewater and solids-bearing fluids where an AODD pump is appropriate. Final suitability depends on the actual fluid, concentration, temperature and duty point.

Selection guidance

Provide the fluid name and concentration, temperature, viscosity, solids size, suction lift, required flow, discharge pressure, connection standard and available air pressure. For service parts, also provide the pump nameplate and the removed component code where visible.

SERVICE MATCHING

Kit contents and service relationship

WILDEN PART / KIT

71-7557 · Wilden® Equalizer® Surge Dampener SD Series creates laminar process flow by reducing and/or elimina…

Wilden 2" Surge Dampener, Aluminum NPT Santoprene® Elastomers

No verified component-level BOM is available for this record.

Kit contents and quantities can change by pump generation, material code, special option and revision. DFIN verifies the exact item number and BOM before quotation.

Maintenance notes

Isolate and depressurize both air and fluid lines before service. Inspect diaphragms, valve balls, seats, seals, shaft and air-valve wear together. Follow the applicable WILDEN service manual for assembly sequence, lubrication and fastener torque.

DFIN TECHNICAL DECISION SUPPORT

A practical guide to SD2

Use this page as a working product dossier: identify the item, review the duty, verify service relationships and prepare a complete enquiry.

Ask DFIN to verify this record

Identify the installed pump

Part 71-7557 should be checked against the full pump model, generation, serial number and existing component marking.

Confirm material and quantity

Similar service parts can differ by elastomer, polymer, metal grade, package quantity or pump revision. Confirm every field before ordering.

Review kit relationship

Determine whether this item is supplied individually, inside an Air End or Wet End kit, or as part of a larger assembly.

Prepare the maintenance record

Record the failure position, operating hours, fluid, pressure and photographs. This helps identify related wear items before the pump is returned to service.

COMPATIBLE PUMP REFERENCES

Pump references related to this service item

Use these records as identification leads. DFIN verifies the exact revision, material and package scope before supply.

Browse all complete pumps →

PRODUCT & SERVICE FAQ

Questions about SD2

Answers for identification, selection and service planning. For a confirmed quotation, DFIN checks the complete application and configuration.

Send your item number to DFIN →

How do I verify part 71-7557?

Use the complete item code together with the pump model, serial number, generation and material configuration. A photograph of the removed part is helpful, but appearance alone is not sufficient.

Is this part sold individually or in a kit?

The supply scope depends on the item record and pump revision. DFIN can check whether it is individual, included in an Air End or Wet End kit, or supplied as an assembly.

Can a similar-looking part be substituted?

Not without verification. Dimensions, material, elastomer grade, valve geometry and generation can differ even when the overall appearance is similar.

What information speeds up a parts quotation?

Send the part code, pump nameplate, required quantity, material, position in the assembly, reason for replacement and delivery destination.