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Fox S.r.l. High Pressure Pulsation Dampeners

Complete product line — 8 families — distributed exclusively by Griffco Valve, Inc.

Griffco Valve offers the complete Fox S.r.l. pulsation dampener line, manufactured in Opera (MI), Italy. Fox dampeners extend Griffco’s standard PD series into high-pressure and chemically aggressive applications across eight technology families, covering pressures from 10 bar to 20,000 PSI. All models are ISO 9001 certified.

ASME U-Stamp Available: Most Fox pulsation dampener models are available with ASME U-stamp certification. Additional international pressure vessel certifications are also available — see full list below.
Flange Connections & Custom Units: Flange connections are available on many models. Custom units are also available to meet specific application, material, or dimensional requirements — contact Griffco for details and pricing.
Pre-Charge — Applies to All Gas-Charged Models: Charge with dry nitrogen to 60–80% of system working pressure. Recommended compression ratio P2/P0 = 2.5; maximum 4.0. Mechanical life decreases as compression ratio increases. Use Griffco’s Pulsation Dampener Calculator for volume sizing.

Product Series Quick Selector

Series Type Body Max Pressure Volume Orientation Key Characteristic
HTRX Bladder 316L SS 120 bar / 1,740 psi 1–50 L61–3,051 in³ H / V (N₂ up) Top-repairable; 7 elastomer options
HBX Bladder 316L SS / Exotic High pressure 10–50 L610–3,051 in³ H / V (N₂ up) Large volume; bottom-repairable
HSTX Diaphragm 316L SS / Exotic 210 bar std / 20,000 PSI special 0.03–10 L1.8–610 in³ H / V (N₂ up) Compact unscrewable; widest pressure range
HP Piston Carbon Steel 250 bar / 3,625 psi 0.3–250 L18–15,256 in³ Any Largest volume range; any orientation
BTHX PTFE Bellow 316L SS / Exotic High pressure 0.06–15 L3.7–915 in³ H / V PTFE bellow; universal chemical compatibility
BSTX SS Metallic Bellow 316L SS / Exotic High pressure 0.35–10 L21–610 in³ H / V Zero elastomers; ultra-high temp / ultra-pure
MPX PTFE Flat Diaphragm 316L SS / Exotic 150 bar / 2,175 psi 1.5–12 L92–732 in³ Any Any orientation; pharma/FDA; rupture detector option

Bladder Type

HTRX

Bladder · 316L Stainless Steel · Top-Repairable · Medium–High Pressure
HTRX Pulsation Dampener
Max Working Pressure 30–120 bar (435–1,740 psi)
Test Pressure (PT) PS × 1.43 / 1.3 / 1.5
Body AISI 316L Stainless Steel
Volume Range 1–50 liters61–3,051 in³
Bladder Materials NBR, HNBR, EPDM, FPM, HYTREL, Butyl, Polyurethane
N₂ Valve (Standard) ⅝” UNF
Installation Horizontal / Vertical (N₂ valve upward)
Repair Access Top-repairable; field bladder replacement
Compression Ratio Recommended P2/P0 = 2.5; max 4.0
ALSO AVAILABLE: Epoxy painted · SAE 3000/6000, ANSI B16.5, UNI/DIN flanges · API 6A type 6BX · Autoclave / Grayloc · Integral flange · Maintenance-Free execution (HTRX-SMF) · Exotic material body · High-pressure execution · Special volumes

HBX

Bladder · 316L SS / Exotic · Bottom-Repairable · High Pressure · Large Volume
HBX Pulsation Dampener
Max Working Pressure High pressure — contact Griffco for rating
Test Pressure (PT) PS × 1.43 / 1.3 / 1.5
Body 316L SS or exotic / special material
Volume Range 10–50 liters610–3,051 in³
N₂ Valve (Standard) ⅝” UNF
Installation Horizontal / Vertical (N₂ valve upward)
Repair Access Bottom-repairable; large volume field service
Compression Ratio Recommended P2/P0 = 2.5; max 4.0
ALSO AVAILABLE: Full flange range (SAE/ANSI/API/Autoclave/Grayloc/Integral) · SMF maintenance-free · Exotic materials · Special volumes

Diaphragm Type

HSTX Diaphragm · 316L SS / Exotic · Unscrewable Body · Standard to 210 bar · Special to 20,000 PSI
HSTX Diaphragm Pulsation Dampener
Max Pressure (Std) 150–210 bar (2,175–3,045 psi)
Max Pressure (Special) Up to 1,379 bar (20,000 PSI) on request
Test Pressure (PT) PS × 1.43 / 1.3 / 1.5
Body AISI 316L SS (exotic materials available)
Volume Range 0.03–10 liters1.8–610 in³
Diaphragm Materials NBR, HNBR, EPDM, FPM (Viton), HYTREL
N₂ Valve (Standard) ⅝” UNF
Installation Horizontal / Vertical (N₂ valve upward)
Compression Ratio Recommended P2/P0 = 2.5; max 4.0
ALSO AVAILABLE: SAE 3000/6000, ANSI B16.5, UNI/DIN, API 6A type 6BX, Autoclave, Grayloc, integral flange · High-pressure execution to 20,000 PSI · Maintenance-Free (HSTX-SMF) · Exotic materials · Special volumes
HST / H / HI Diaphragm · Carbon Steel · Crimped Body · Hydraulic / Oil Service
HST/H/HI Diaphragm Pulsation Dampeners
HST Max Pressure 300 bar (4,350 psi)
H Max Pressure 250 bar (3,625 psi)
HI Max Pressure 330 bar (4,785 psi)
Test Pressure (PT) PS × 1.43 / 1.3 / 1.5
Body Carbon steel painted; crimped — no welds
Diaphragm (Standard) Mineral oil / non-aggressive; non-repairable
Working Temp -20°C to +80°C
Installation Horizontal / Vertical (N₂ valve upward)
NOTE: HST, H, and HI are primarily specified for hydraulic and mineral oil service. For chemical metering, specify HSTX (316L SS unscrewable, chemical-compatible diaphragm).

Piston Type

HP Piston · Carbon Steel · Not Repairable (0.3–8 L / 18–488 in³) & Repairable (7–250 L / 427–15,256 in³) · Any Orientation
HP Piston Pulsation Dampener
Max Working Pressure 250 bar (3,625 psi)
Test Pressure (PT) PS × 1.43 / 1.3 / 1.5
Body — Not Repairable Carbon steel; crimped, no welds; 0.3–8 L 18–488 in³
Body — Repairable Carbon steel with screwed caps; 7–250 L 427–15,256 in³
Piston Material Aluminum
Seals (Standard) NBR (repairable version)
Working Temp -20°C to +80°C
N₂ Valve (Standard) ⅝” UNF
Installation Any position

PTFE Bellow & SS Metallic Bellow Type

BTHX PTFE Elastomeric Bellow · 316L SS Body · Unscrewable · High Pressure
BTHX PTFE Bellow Pulsation Dampener
Max Working Pressure High pressure — contact Griffco for rating
Test Pressure (PT) PS × 1.43 / 1.3 / 1.5
Body 316L SS or exotic / special material
Bellow Material PTFE elastomer — compatible with virtually all chemicals
Volume Range 0.06–15 liters3.7–915 in³
Construction Unscrewable body; fully field-repairable
ALSO AVAILABLE: Special volumes · Exotic material body · Full flange and connection range · SMF maintenance-free execution
BSTX SS Metallic Bellow · 316L SS Body · Welded Cap · Zero Elastomers · High Pressure
BSTX SS Metallic Bellow Pulsation Dampener
Max Working Pressure High pressure — contact Griffco for rating
Test Pressure (PT) PS × 1.43 / 1.3 / 1.5
Body 316L SS or exotic / special material
Bellow Material Stainless steel metallic — zero elastomers
Volume Range 0.35–10 liters21–610 in³
Construction Welded top cap
Best For Ultra-high temp, cryogenic, or zero-elastomer service
ALSO AVAILABLE: Exotic materials · Special volumes · Full connection and flange range on request

PTFE Flat Diaphragm Type

MPX PTFE Flat Diaphragm · 316L SS Unscrewable Body · Any Orientation · Single / Double / Double Sandwich
MPX PTFE Flat Diaphragm Pulsation Dampener
Max Working Pressure 150 bar (2,175 psi) standard; higher on request
Test Pressure (PT) PS × 1.43 / 1.3 / 1.5
Body AISI 316L SS; exotic materials available
Diaphragm PTFE flat (Teflon); FDA-certified PTFE available
Volume Range 1.5–12 liters92–732 in³; special volumes on request
N₂ Valve (Standard) ⅝” UNF
Installation Any position — no orientation restriction
Configurations Single / Double / Double Sandwich diaphragm
Rupture Detector Pressure switch, transmitter, gauge, or piston (double sandwich)
Pharma Execution Lapped / electro-polished; cGMP surface finish
Compression Ratio Recommended P2/P0 = 2.5; max 4.0
Construction Unscrewable body; fully field-repairable
ALSO AVAILABLE: SAE 3000/6000, ANSI B16.5, UNI/DIN, API 6A type 6BX, Autoclave, Grayloc, integral flange · Special connections · High-pressure special execution · Exotic material / carbon steel body · FDA-certified PTFE diaphragm · Lapped / electro-polished pharmaceutical execution · Double single in-line flow-through · Special volumes

Download Product Documents

Title Description Date Download
Fox S.r.l. Product Data Sheets
Fox Complete Catalogue All Fox families — specifications, dimensions, configurations 2025 PDF
Data Sheet HSTX (up to 210 bar / 3,045 psi) Diaphragm series — standard and high-pressure configurations — PDF
Data Sheet HSTX (up to 100 bar / 1,450 psi) Diaphragm series — lower pressure range — PDF
Data Sheet HTRX Bladder series — 316L SS, top-repairable — PDF
Data Sheet MPX PTFE flat diaphragm series — all configurations including double sandwich — PDF
Griffco Pulsation Dampener Reference
IOM Manual PD (US) Installation, Operation & Maintenance — pre-charge procedures applicable to all gas-charged Fox dampeners 04-05-2022 PDF
Data Sheet PD (US) Standard Griffco PD series — reference for comparison and sizing 04-05-2022 PDF

International Certifications Available

Fox pulsation dampeners can be supplied with a wide range of pressure vessel certifications to meet project and regional compliance requirements. Contact Griffco for availability on specific models and configurations.

  • CE (2014/68/EU — PED)
  • ARH (Algeria)
  • ATEX (2014/34/EU)
  • SELO (China)
  • ASME VIII Div. 1 or Div. 2 (latest edition)
  • CU-TR 032/2013 (Russia)
  • U-Stamp + L. Service / National Board
  • DOSH (Malaysia)
  • EN 14359
  • NR-13 (Brazil)
  • PD 5500 (UK)
  • CRN (Canada)
  • EN 13445
  • KOSHA (Korea)
  • AS 1210 + AS 4343 (Australia)
Additional international certifications are available in addition to other testing requirements that may be needed. Contact Griffco for details and pricing.

Pulsation Dampener Sizing Calculator

Sizing the pulsation dampener properly will help prevent water hammer and reduce friction losses in your discharge line. Click below to use Griffco’s Pulsation Dampener Sizing Calculator, or submit a request for quote and our team will assist with Fox series selection and sizing.

Need pricing, series selection, or application sizing support for Fox pulsation dampeners?
Calculate Your Pulsation Dampener Size Submit a Request for Quote

Special / Custom Units

The Griffco/FOX engineering team specializes in custom dampener design for OEM partners and end-use clients, including high-capacity “damper lung” configurations for industrial and oil & gas pump applications. Custom solutions are available with:

  • High-volume stainless steel construction for seawater, brine, and corrosive fluid applications
  • Exotic alloy options (Inconel®, Hastelloy®, Duplex stainless) engineered for aggressive chemical environments
  • Flexible end connections — threaded, flanged, or sanitary configurations to meet process and hygienic requirements

Griffco/FOX works directly with OEM and client engineering teams to develop application-specific solutions that meet performance, material, and certification requirements.

Submit your information and someone from our design team will contact you to discuss your custom unit specifications.

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