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Hydronamic (CV18S-MxF) Check Valve - 1-8" MNPT x 1-8" FNPT

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Hydronamic (CV18S-MxF) Check Valve - 1-8" MNPT x 1-8" FNPT

The Hydronamic CV18S-MxF Check Valve prevents backflow in your water filtration system with precision-engineered 303 stainless steel construction and 1.0 psi cracking pressure. Built for reliable one-way flow control, this 1/8" MNPT x 1/8" FNPT valve handles up to 0.84 gpm at 20 psi.
SPECIFICATIONS

Hydronamic CV18S-MxF Technical Details

Model Number CV18S-MxF
Connection Size 1/8" MNPT x 1/8" FNPT
Material 303 Stainless Steel
Cracking Pressure 1.0 psi ± 0.5
O-Ring Options Silicone, Buna, Viton, EPDM
Flow at 5 psi 0.35 gpm
Flow at 10 psi 0.64 gpm
Flow at 20 psi 0.84 gpm
INSTALLATION & USE

Installing Your Check Valve

  1. Apply thread sealant tape to the 1/8" male NPT end, wrapping 3-4 turns clockwise.
  2. Thread the male end into your upstream fitting hand-tight, then tighten an additional quarter turn with a wrench.
  3. Connect your downstream line to the 1/8" female NPT port, ensuring the arrow on the valve body points in the direction of intended flow.
  4. Pressurize the system slowly and check all connections for leaks before full operation.
COMPATIBILITY

System Integration

The Hydronamic CV18S-MxF check valve works with reverse osmosis systems, booster pumps, water storage tanks, and any filtration setup requiring backflow prevention on 1/8" NPT connections. The low 1.0 psi cracking pressure makes it suitable for point-of-use systems and permeate lines where pressure drop must be minimized. Choose your o-ring compound based on water chemistry: Buna for standard municipal water, Viton for chlorinated or chemical-resistant applications, EPDM for high-temperature resistance, or Silicone for broad compatibility.

🔧 Install the check valve vertically with flow going upward whenever possible to ensure consistent cracking pressure and prevent valve chatter in low-flow conditions.
The Hydronamic CV18S-MxF Check Valve prevents backflow in your water filtration system with precision-engineered 303 stainless steel construction and 1.0 psi cracking pressure. Built for reliable one-way flow control, this 1/8" MNPT x 1/8" FNPT valve handles up to 0.84 gpm at 20 psi.
SPECIFICATIONS

Hydronamic CV18S-MxF Technical Details

Model Number CV18S-MxF
Connection Size 1/8" MNPT x 1/8" FNPT
Material 303 Stainless Steel
Cracking Pressure 1.0 psi ± 0.5
O-Ring Options Silicone, Buna, Viton, EPDM
Flow at 5 psi 0.35 gpm
Flow at 10 psi 0.64 gpm
Flow at 20 psi 0.84 gpm
INSTALLATION & USE

Installing Your Check Valve

  1. Apply thread sealant tape to the 1/8" male NPT end, wrapping 3-4 turns clockwise.
  2. Thread the male end into your upstream fitting hand-tight, then tighten an additional quarter turn with a wrench.
  3. Connect your downstream line to the 1/8" female NPT port, ensuring the arrow on the valve body points in the direction of intended flow.
  4. Pressurize the system slowly and check all connections for leaks before full operation.
COMPATIBILITY

System Integration

The Hydronamic CV18S-MxF check valve works with reverse osmosis systems, booster pumps, water storage tanks, and any filtration setup requiring backflow prevention on 1/8" NPT connections. The low 1.0 psi cracking pressure makes it suitable for point-of-use systems and permeate lines where pressure drop must be minimized. Choose your o-ring compound based on water chemistry: Buna for standard municipal water, Viton for chlorinated or chemical-resistant applications, EPDM for high-temperature resistance, or Silicone for broad compatibility.

🔧 Install the check valve vertically with flow going upward whenever possible to ensure consistent cracking pressure and prevent valve chatter in low-flow conditions.
$4.75

Original: $13.57

-65%
Hydronamic (CV18S-MxF) Check Valve - 1-8" MNPT x 1-8" FNPT—

$13.57

$4.75

Description

The Hydronamic CV18S-MxF Check Valve prevents backflow in your water filtration system with precision-engineered 303 stainless steel construction and 1.0 psi cracking pressure. Built for reliable one-way flow control, this 1/8" MNPT x 1/8" FNPT valve handles up to 0.84 gpm at 20 psi.
SPECIFICATIONS

Hydronamic CV18S-MxF Technical Details

Model Number CV18S-MxF
Connection Size 1/8" MNPT x 1/8" FNPT
Material 303 Stainless Steel
Cracking Pressure 1.0 psi ± 0.5
O-Ring Options Silicone, Buna, Viton, EPDM
Flow at 5 psi 0.35 gpm
Flow at 10 psi 0.64 gpm
Flow at 20 psi 0.84 gpm
INSTALLATION & USE

Installing Your Check Valve

  1. Apply thread sealant tape to the 1/8" male NPT end, wrapping 3-4 turns clockwise.
  2. Thread the male end into your upstream fitting hand-tight, then tighten an additional quarter turn with a wrench.
  3. Connect your downstream line to the 1/8" female NPT port, ensuring the arrow on the valve body points in the direction of intended flow.
  4. Pressurize the system slowly and check all connections for leaks before full operation.
COMPATIBILITY

System Integration

The Hydronamic CV18S-MxF check valve works with reverse osmosis systems, booster pumps, water storage tanks, and any filtration setup requiring backflow prevention on 1/8" NPT connections. The low 1.0 psi cracking pressure makes it suitable for point-of-use systems and permeate lines where pressure drop must be minimized. Choose your o-ring compound based on water chemistry: Buna for standard municipal water, Viton for chlorinated or chemical-resistant applications, EPDM for high-temperature resistance, or Silicone for broad compatibility.

🔧 Install the check valve vertically with flow going upward whenever possible to ensure consistent cracking pressure and prevent valve chatter in low-flow conditions.
Hydronamic (CV18S-MxF) Check Valve - 1-8" MNPT x 1-8" FNPT | Isopure Water