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SENTRY™ Pulsation Dampeners & Surge Suppressors
Smoother fluid flow | Prevent water hammer | Improve system performance

Pulsation dampeners are installed at the pump discharge to fill with process fluid on the discharge stroke and then release some of that fluid on the suction stroke to keep the fluid moving smoothly downstream. Pulsation dampeners and surge suppressors remove virtually all system shock to enhance performance, reliability, and safety in pumping applications. Prevent water hammer, minimize pulsation, eliminate vibration, and ensure a consistent and laminar fluid flow.

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STOP THE SHAKE: UNDERSTANDING PULSATION DAMPENERS

Think of a positive displacement pump like a mechanical heart. Just like your heart squeezes and relaxes to move blood, positive displacement pumps (such as peristaltic and AODD pumps) create flow by pumping fluid in a rhythmic pattern. This creates the distinctive pulsing action in your process fluid.

This pulsating action can cause:

  • Excessive noise and pipe vibration
  • Damage to pump system equipment
  • Reduced accuracy of meters and gauges
  • Shortened component life
  • Premature pump failure and inefficiency

Blacoh SENTRY™ pulsation dampeners are engineered specifically to address these issues. Pulsation dampeners have a flexible internal bladder that, when properly charged, absorb the pulsations and help to create a smoother laminar flow. In other words, pulsation dampeners absorb the kinetic energy of your moving fluid, smoothing out the flow and pressure of your system – which means they minimize the damage caused by system fluctuations.

Water hammer (or hydraulic shock) occurs when fluid in motion is suddenly started, stopped or forced to change direction. Quick closing valves, rapid pump startup/shutdown, even changes in the pipe profile, can cause an abrupt change in fluid velocity producing violent and sometimes catastrophic water hammer. Surge suppressors act as shock absorbers by accumulating and releasing process fluid as needed to slow the rate of fluid velocity change to a level low enough to prevent water hammer.

Dampener pre-charge pressure depends on the specific application, usage, and dampener model or type. Generally speaking, pulsation dampeners installed at the pump discharge are pre-charged to approximately 80% of expected mean system pressure. Once the pump is started to generate system pressure, the charge can be increased or decreased to optimize the dampening effect.

You can read more about pulsation dampeners and how they work on our blog.

  • Protects pumps, piping, valves, fittings, and components from damaging vibrations and fatigue.
  • Prevents destructive pressure surges caused by rapid pump startup and shutdown.
  • Prevents hydraulic shock from quick closing valves or equipment shutdown.
  • Improves the accuracy and longevity of flow meters, pressure gauges and other inline instrumentation.
  • Ensures a smooth and consistent fluid flow in metering pump systems, chemical injection processes, and dosing applications.
  • Reduces product agitation, foaming, splashing and contamination.
  • Ensures uniform and continuous application in spraying and coating processes.
  • Improves the transfer process when pumping viscous or abrasive fluids.
  • Simple and reliable design for quick installation and easy inline maintenance.
  • Each unit factory pressure tested to assure proper function and leak-free operation.
  • Proudly made in the USA.

AIR CONTROL OPTIONS

CHARGEABLE
No permanent source of compressed gas is required. With the gas fill valve, the dampener can be manually bled or charged to the required pressure setting.

AUTOMATIC
The dampener automatically adjusts as system pressure increases or decreases , and resets to be ready to start dampening again when the system restarts.

ADJUSTABLE
With a compressed air line permanently attached, the regulator allows for an easy, convenient method to adjust dampener pressure with system pressure changes.

The amount of pulsation absorbed by a dampener is a function of the dampener size to the pump stroke volume. An undersized dampener cannot absorb enough energy to adequately compensate for fluctuations in pressure and flow. An oversized dampener stores more fluid and can, in some cases, result in slow equalization and delayed response to system changes. Be sure to select the correct dampener for your application.

4IN3 SENTRY III

HOUSING MATERIALS: CPVC, Polypropylene, PVC, PVDF, Alloy 20, Hastelloy C, Stainless Steel, 30 RA Polished Stainless Steel
BLADDER MATERIALS: Buna-N, EPDM, Hypalon, Neoprene, PTFE, Santoprene, Silicone (Food Grade), Viton
INLET SIZES: 0.375" (10mm), 0.5" (15mm), 0.75" (20mm) Tri-clamp
INLET TYPES: FNPT, BSP, ANSI Flange, DN Flange, Socket Weld, Tri-Clamp, Union
PRESSURE RATINGS: 150 psi (10.3 bar), PVDF 200 psi (13.7 bar), 1000 psi (68.9 bar)
AIR CONTROLS: Adjustable, Chargeable, SS Chargeable (V Model)
CERTIFICATIONS & TESTING: ATEX, NSF, CRN, PED, ARRA, 3.1 Cert, Material Cert, Cert of Origin, Hydrostatic, Dye Penetrant, Radiography, PMI, Bolt Tensile, Customer Specified

HOUSING CONSTRUCTION

Series Wetted/Nonwetted
Plastic
04PP Polypropylene
04PVC PVC
04X CPVC
04K PVDF
Metal
1120 Stainless Steel
1170 Alloy 20
1175 Alloy 20/Stainless Steel
1185 Hastelloy C/Stainless Steel
7325 Stainless Steel (Tri-clamp)
8325 Stainless Steel 30 RA Polish (Tri-clamp)

10IN3 SENTRY III

HOUSING MATERIALS: Acetal, CPVC, Polypropylene, PVC, PVDF, Alloy 20, Hastelloy C, Stainless Steel, 30 RA Polished Stainless Steel
BLADDER MATERIALS: Buna-N, EPDM, Hypalon, Neoprene, PTFE, Santoprene, Silicone (Food Grade), Viton
INLET SIZES: 0.375" (10mm), 0.5" (15mm), 0.75" (20mm) Tri-clamp
INLET TYPES: FNPT, BSP, ANSI Flange, DN Flange, Socket Weld, Tri-Clamp, Union
PRESSURE RATINGS: 150 psi (10.3 bar), PVDF 200 psi (13.7 bar), 1000 psi (68.9 bar)
AIR CONTROLS: Adjustable, Chargeable, SS Chargeable (V Model)
CERTIFICATIONS: ATEX, NSF, CRN, PED, ARRA, 3.1 Cert, Material Cert, Cert of Origin, Hydrostatic, Dye Penetrant, Radiography, PMI, Bolt Tensile, Customer Specified

HOUSING CONSTRUCTION

Series Wetted/Nonwetted
Plastic
10D Acetal
10PP Polypropylene
10PVC PVC
10X CPVC
10K PVDF
Metal
1020 Stainless Steel
1070 Alloy 20
1075 Alloy 20/Stainless Steel
1085 Hastelloy C/Stainless Steel
7320 Stainless Steel (Tri-clamp)
8320 Stainless Steel 30 RA Polish (Tri-clamp)

36IN3 SENTRY II

HOUSING MATERIALS: Acetal, CPVC, Polypropylene, PTFE, PVC, PVDF, Alloy 20, Carbon Steel, Hastelloy C, Stainless Steel, 30 RA Polished Stainless Steel
BLADDER MATERIALS: Aflas, Buna-N, Buna-N (Food Grade), EPDM, Hypalon, Neoprene, PTFE, Santoprene, Silicone (Food Grade), Viton
INLET SIZES: 0.5" (15mm), 0.75" (20mm), 1" (25mm), 1.5" (40mm) Tri-clamp
INLET TYPES: FNPT, BSP, ANSI Flange, DN Flange, Socket Weld, Tri-Clamp, Union
PRESSURE RATINGS: 150 psi (10.3 bar), 1000 psi (68.9 bar)
AIR CONTROLS: Adjustable, Automatic, Chargeable, SS Chargeable (V Model)
CERTIFICATIONS: ATEX, NSF, CRN, PED, ARRA, 3.1 Cert, Material Cert, Cert of Origin, Hydrostatic, Dye Penetrant, Radiography, PMI, Bolt Tensile, Customer Specified

HOUSING CONSTRUCTION

Series Wetted/Nonwetted
Plastic
601 PTFE
1301 Polypropylene
1305 Polypropylene (0.5")
1311 PVC
1315 PVC (0.5")
1341 CPVC/PVC
1345 CPVC/PVC (0.5")
1401 PVDF/Polypropylene
1801 Acetal/Polypropylene
Metal
3120 Stainless Steel
3140 Carbon Steel
3175 Alloy 20/Stainless Steel
3185 Hastelloy C/Stainless Steel
7225 Stainless Steel (Tri-clamp)
8225 Stainless Steel 30 RA Polish (Tri-clamp)

85IN3 SENTRY II

HOUSING MATERIALS: Acetal, Conductive Polypropylene, CPVC, Polypropylene, PTFE, PVC, PVDF, Alloy 20, Carbon Steel, Hastelloy C, Stainless Steel, 30 RA Polished Stainless Steel
BLADDER MATERIALS: Aflas, Buna-N, Buna-N (Food Grade), EPDM, Hypalon, Neoprene, PTFE, Santoprene, Silicone (Food Grade), Viton
INLET SIZES: 0.5" (15mm), 0.75" (20mm), 1" (25mm), 1.5" (40mm) Tri-clamp
INLET TYPES: FNPT, BSP, ANSI Flange, DN Flange, Socket Weld, Tri-Clamp, Union
PRESSURE RATINGS: 150 psi (10.3 bar), PVDF 250 psi (17.2 bar), 1000 psi (68.9 bar)
AIR CONTROLS: Adjustable, Automatic, Chargeable, SS Chargeable (V Model)
CERTIFICATIONS: ATEX, NSF, CRN, PED, ARRA, 3.1 Cert, Material Cert, Cert of Origin, Hydrostatic, Dye Penetrant, Radiography, PMI, Bolt Tensile, Customer Specified

HOUSING CONSTRUCTION

Series Wetted/Nonwetted
Plastic
301 Polypropylene
305 Polypropylene (0.5")
311 PVC
315 PVC (0.5")
321 Conductive Polypropylene
331 CPVC
335 CPVC (0.5")
401 PVDF/Polypropylene
421 PVDF
651 PTFE
801 Acetal/Polypropylene
Metal
3020 Stainless Steel
3040 Carbon Steel
3075 Alloy 20/Stainless Steel
3085 Hastelloy C/Stainless Steel
7220 Stainless Steel (Tri-clamp)
8220 Stainless Steel 30 RA Polish (Tri-clamp)

175IN3 SENTRY I

HOUSING MATERIALS: Polypropylene, PTFE, PVC, PVDF, Alloy 20, Hastelloy C, Stainless Steel, 30 RA Polished Stainless Steel
BLADDER MATERIALS: Aflas, Buna-N, EPDM, Hypalon, Neoprene, PTFE, Santoprene, Silicone (Food Grade), Viton
INLET SIZES: 1.5" (40mm), 2" (50mm), 2.5" (65mm) Tri-clamp
INLET TYPES: FNPT, BSP, ANSI Flange, DN Flange, Socket Weld, Tri-Clamp, Union
PRESSURE RATINGS: 150 psi (10.3 bar), 1000 psi (68.9 bar)
AIR CONTROLS: Adjustable, Automatic, Chargeable, SS Chargeable (V Model)
CERTIFICATIONS: ATEX, NSF, CRN, PED, ARRA, 3.1 Cert, Material Cert, Cert of Origin, Hydrostatic, Dye Penetrant, Radiography, PMI, Bolt Tensile, Customer Specified

HOUSING CONSTRUCTION

Series Wetted/Nonwetted
Plastic
501 PTFE
901 Polypropylene/Noryl
905 Polypropylene/Noryl (1.5")
911 PVC/Noryl
915 PVC/Noryl (1.5")
1201 PVDF/Noryl
Metal
2175 Stainless Steel
2185 Hastelloy C/Stainless Steel
2500 Stainless Steel/Noryl
2520 Stainless Steel
7125 Stainless Steel (Tri-clamp)
8125 Stainless Steel 30 RA Polish (Tri-clamp)

370IN3 SENTRY I

HOUSING MATERIALS: Polypropylene, PTFE, PVC, PVDF, Alloy 20, Hastelloy C, Stainless Steel, 30 RA Polished Stainless Steel
BLADDER MATERIALS: Aflas, Buna-N, EPDM, Hypalon, Neoprene, PTFE, Santoprene, Silicone (Food Grade), Viton, SS Metal Belows (Series 2420)
INLET SIZES: 1.5" (40mm), 2" (50mm), 2.5" (65mm) Tri-clamp
INLET TYPES: FNPT, BSP, ANSI Flange, DN Flange, Socket Weld, Tri-Clamp, Union
PRESSURE RATINGS: 150 psi (10.3 bar), PVDF 200 psi (13.7 bar), 1000 psi (68.9 bar)
AIR CONTROLS: Adjustable, Automatic, Chargeable, SS Chargeable (V Model)
CERTIFICATIONS: ATEX, NSF, CRN, PED, ARRA, 3.1 Cert, Material Cert, Cert of Origin, Hydrostatic, Dye Penetrant, Radiography, PMI, Bolt Tensile, Customer Specified

HOUSING CONSTRUCTION

Series Wetted/Nonwetted
Plastic
101 Polypropylene
105 Polypropylene (1.5")
111 PVC
115 PVC (1.5")
201 PVDF/Polypropylene
221 PVDF
551 PTFE
Metal
2075 Alloy 20/Stainless Steel
2085 Hastelloy C/Stainless Steel
2400 Stainless Steel/Polypropylene
2420 Stainless Steel
7120 Stainless Steel (Tri-clamp)
8121 Stainless Steel 30 RA Polish (Tri-clamp)

1155IN3 SENTRY IV

HOUSING MATERIALS: Polypropylene, Aluminum, Epoxy Coated Aluminum, Alloy 20, Carbon Steel, Epoxy Coated Carbon Steel, Hastelloy C, Stainless Steel, 30 RA Polished Stainless Steel
BLADDER MATERIALS: Buna-N, EPDM, Hypalon, Neoprene, PTFE, Silicone (Food Grade), Viton
INLET SIZES: 3" (80mm), 4" (100mm), 6" (150mm)
INLET TYPES: FNPT, ANSI Flange, DN Flange, Tri-Clamp
PRESSURE RATINGS: 150 psi (10.3 bar), 275 psi (18.9 bar)
AIR CONTROLS: Adjustable, Automatic, Chargeable, SS Chargeable (V Model)
CERTIFICATIONS: ATEX, PED, ARRA, 3.1 Cert, Material Cert, Cert of Origin, Hydrostatic, Dye Penetrant, PMI, Bolt Tensile, Customer Specified

HOUSING CONSTRUCTION

Series Wetted/Nonwetted
Plastic
P4000 Polypropylene
Epoxy Coated
4010 Epoxy Coating Aluminum/Aluminum
4015 Epoxy Coated Aluminum
4045 Epoxy Coated Carbon Steel
4046 Epoxy Coated Carbon Steel/Aluminum
4065 Stainless Steel/Epoxy Coated Carbon Steel
Metal
4000 Aluminum
4020 Stainless Steel
4030 Carbon Steel/Aluminum
4040 Carbon Steel
4050 Stainless Steel/Aluminum
4060 Stainless Steel/Carbon Steel
4075 Alloy 20/Stainless Steel
4080 Hastelloy C
4085 Hastelloy C/Stainless Steel
7420 Stainless Steel (Tri-clamp)
8420 Stainless Steel 30 RA Polish

2310IN3 SENTRY V

HOUSING MATERIALS: Carbon Steel, Epoxy Coated Carbon Steel, Stainless Steel
BLADDER MATERIALS: Buna-N, EPDM, Hypalon, Neoprene, Silicone (Food Grade), Viton
INLET SIZES: 3" (80mm), 4" (100mm), 6" (150mm)
INLET TYPES: FNPT, ANSI Flange, DN Flange
PRESSURE RATINGS: 275 psi (18.9 bar)
AIR CONTROLS: Adjustable, Automatic, Chargeable, SS Chargeable (V Model)
CERTIFICATIONS: ATEX, PED, ARRA, 3.1 Cert, Material Cert, Cert of Origin, Hydrostatic, Dye Penetrant, PMI, Bolt Tensile, Customer Specified

HOUSING CONSTRUCTION

Series Wetted/Nonwetted
5020 Stainless Steel
5040 Carbon Steel
5045 Epoxy Coated Carbon Steel