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SENTRY™ Inlet Stabilizers
Stabilize pressure and flow | Eliminate acceleration head loss | Extend diaphragm life

Installed at the pump’s inlet, an inlet stabilizer acts as an accumulator to store fluid and release it back into the line as needed. Virtually all acceleration head loss is eliminated because the pump draws fluid from the dampener and not the pipeline, avoiding the risk of cavitation and ensuring complete chamber fill on each inlet stroke of the pump.

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WHEN VIBRATION THREATENS YOUR SYSTEM

Imagine squeezing a tube of toothpaste. Each time you squeeze, a glob of toothpaste has no choice but to move forward. That's exactly how positive displacement pumps work. They create flow by trapping and pushing fluid forward in a steady rhythm - squeeze, release, squeeze, release - much like your heart pumping blood through your body. When you watch the fluid flowing through these pumps (like peristaltic or AODD pumps), you can see this rhythmic pulsing.

When pulsating fluid is being drawn into a pump on the inlet/suction side, it can cause:

  • Cavitation
  • Vibration and water hammer
  • Damage to equipment
  • Flow rate issues
  • Premature pump failure and inefficiency

Blacoh SENTRY™ Inlet Stabilizers (also called suction stabilizers) act as an accumulator to store fluid and release it back into the line as needed. When the pump tries to pull fluid in, instead of creating a harsh pressure drop, the inlet stabilizer releases some of its stored fluid. When the pressure normalizes, the inlet stabilizer refills. It’s like having a small reservoir that smooths out the “gulping” action of the pump. Virtually all acceleration head loss is eliminated because the pump draws fluid from the dampener instead of the pipeline, avoiding the risk of cavitation and ensuring complete chamber fill on each inlet stroke of the pump.

This is particularly important when pumping from a non-pressurized tank or when dealing with viscous fluids that don’t flow easily.

You can read more about inlet stabilizers and how they can protect your system on our blog.

  • Minimizes pressure fluctuations and prevents water hammer pressure spikes.
  • Eliminates acceleration head loss and cavitation.
  • Extends pump diaphragm life and protects system components from excess stress, vibration and fatigue.
  • Smooths inlet fluid flow and ensures complete pump chamber fill.
  • Improves accuracy of inlet side gauges.
  • Proudly made in the USA.

AIR CONTROL OPTIONS

CHARGEABLE
The inlet stabilizer air control allows for pressure or vacuum settings and is adjustable for suction lift or positive inlet conditions. No permanent source of compressed gas is required. Gas fill valve allows dampener to be manually bled or charged to the required pressure setting.

NEW! AUTOMATIC
Available only on the SENTRY Automatic Inlet Stabilizer
Permanent source of compressed gas is required. Incorporates a fully integrated, automatic venturi valve designed to accommodate negative pressures within the system. This dual-control mechanism ensures optimal system performance in both suction & positive pressure conditions.

NEW! SENTRY Automatic Inlet Stabilizer

HOUSING MATERIALS: Stainless Steel
DIAPHRAGM MATERIALS: PTFE
INLET SIZES:1.5", 2"
INLET TYPES: FNPT, BSP, ANSI Flange, Tri-Clamp
PRESSURE RATINGS: 150 psi (10.3 bar)
AIR CONTROLS: Automatic
CERTIFICATIONS & TESTING: 3.1 Cert, Material Cert, Cert of Origin, Hydrostatic, Dye Penetrant, Radiography, PMI, Bolt Tensile, Customer Specified

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: Chargeable
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
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)

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: Chargeable
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)

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: Chargeable
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, EPDM (Food Gradde), 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: Chargeable
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, EPDM (Food Grade), 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: Chargeable
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