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MK50/60 Series with threaded ends

Mark 50 Series ⟶

Self-Operated Sliding Gate Back Pressure Regulator; Quick Ship Available
1/4" - 4", up to 200 Cv

Mark 501 Series picture

Mark 501/502 Series ⟶

High Flow Back Pressure Regulator; Sliding Gate; 1-1/2″ – 2″ (DN40 – DN50)

Mark 50HP/60HP Series picture

Mark 50HP Series ⟶

High Pressure Back Pressure Regulator; Up to 450 psi (31 bar); 1/4" - 4" (DN8 - DN100)

Mark 51 Series High Sensitivity Back Pressure Regulator

Mark 51 Series ⟶

Large diaphragm, 1/4" - 3/4" size range

Mark 52 Series picture

Mark 52 Series ⟶

Internally Piloted Back Pressure Regulator

Mark 53/63 Series

Mark 53/54 Series ⟶

Differential, Jorlon Diaphragm

Mark 60 Series

Mark 55 Series ⟶

Upstream Vacuum, Jorlon Diaphragm

Mark 56 Series

Mark 56/560 Series ⟶

Dome Loaded, High Accuracy

Mark 57 Series

Mark 57 Series ⟶

Pilot-Operated, Superior Accuracy

Mark 675 Series - Wafer style pressure regulator

Mark 575 Series ⟶

Wafer Style, Jorlon Diaphragm

Mark 58FTA SEries

Mark 58FT/A Series ⟶

Cage Trim, Dual Inlet & Outlet for Through-Flow

Mark 58G Series - Globe Style Back Pressure Regulating Valve

Mark 58G Series ⟶

Globe Style, Back Pressure Regulating Valve

Mark 586 Series picture

Mark 586FT/586A Series ⟶

Dome Loaded

MK50/60 Series with threaded ends

Mark 60 Series ⟶

Self-Operated Sliding Gate Pressure Reducing Regulator; Quick Ship Available

Mark 602 Series

Mark 601/602 Series ⟶

Self-Operated, High Flows

Mark 50HP/60HP Series picture

Mark 60HP Series ⟶

High Pressure Regulator

Mark 61 Series

Mark 61 Series ⟶

High Sensitivity

Mark 62 Series picture

Mark 62 Series ⟶

Internally Piloted Regulator

Mark 63CDF Series

Mark 63/64 Series ⟶

Differential Pressure Regulators; Sliding Gate Seat; 1/4″ – 2″ (DN8 – DN50);

Mark 66 Air Loaded Pressure Reducing Regulator

Mark 66/660 Series ⟶

Air Loaded Pressure Reducing Regulator, Sliding Gate Seat, High Accuracy

Mark 6769 Series

Mark 67/69 Series ⟶

Pilot-Operated, High Flow

Mark 675 Series - Wafer style pressure regulator

Mark 675 Series ⟶

Wafer Style, Jorlon Diaphragm

Mark 68G Series - Pressure Reducing Globe Valve

Mark 68G Series ⟶

Pressure Reducing Globe Valve, High Capacity, Accurate; Sizes: 1/4″ – 2″ (DN8 – DN50)

Mark 68HP Series picture

Mark 68HP Series ⟶

High Pressure Regulator

Mark 686G Series

Mark 686G Series ⟶

Air-Loaded, Globe Trim, ANSI IV or VI

Mark 630 Series

Mark 630 Series ⟶

Gas Regulator, Self-Operated, High Inlet Pressure

Mark 687 Series

Mark 687 Series ⟶

Piloted Pressure Reducing Regulator for
Critical Low Pressure, High Flow Applications
1-1/2" - 2" (DN40 - DN50); Balanced Plug

Mark 70 Series

Mark 70 Series ⟶

Sliding Gate Jorlon Diaphragm Control Valve

Mark 701/702 Series

Mark 701/702 Series ⟶

Sliding Gate Control Valve for High Flow, Higher Cv's (Kv's)

Mark 78 Series

Mark 78 Series ⟶

Globe Style, Accurate Performance

Mark 75 Series

Mark 75 Series ⟶

Wafer Style, Motor Operated, Very Precise

Mark 75HW Series

Mark 75HW Series ⟶

Wafer Style, Hand Operated, Precise Adjustment

Mark 75MV Series - Motor Operated Control Valve

Mark 75MV Series ⟶

Wafer Style, Motor Operated Control Valve; Sliding Gate; 1″ - 8″ (DN25 - DN200)

Mark75PTP Series

Mark 75PTP Series ⟶

Piston Operated with Smart Positioner

Boiler Feedwater Control Valve

Mark 33 Series ⟶

Boiler Feedwater Control Valve; Motor Operated Sliding Gate; 1/4″ – 2″ (DN8 – DN50)

Mark 37 Series

Mark 37 Series ⟶

Motor Operated Control Valve With Electronic Linear Actuator; 1/4″ – 6″ (DN8 – DN150)

Mark 39 Series

Mark 39 Series ⟶

Motor Operated Three Way

Mark DBAQ Series

Mark DBAQ Series ⟶

Angle Style Control Valve

Mark DA Series

Mark D & DA Series ⟶

Globe & Angle Control Valve

ET & ET Series 1" - 6"

Mark ED & ET Series (1″ – 6″) ⟶

Globe Style Control Valve

EDET Series 8"

Mark ED & ET Series (8″) ⟶

Globe Style Control Valve

Mark EW Series

Mark EW Series ⟶

Globe Style Control Valves

Mark EZ Series

Mark EZ Series ⟶

Globe Style Control Valve

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In applications where ultra-pure water is essential—like pharmaceuticals, electronics manufacturing, labs, and boiler feed treatment—there’s no room for compromise. Deionizing (DI) water systems rely on precise control to remove dissolved salts and ions, and that means using valves and regulators you can trust to maintain purity and system integrity.

Our range of valves for DI water systems includes corrosion-resistant regulator valves, high-purity pressure regulators, and precision control valves—all designed to perform reliably in low-conductivity environments. They help prevent contamination, ensure consistent flow and pressure, and support critical processes like rinse cycle control and resin bed regulation.

Whether you’re fine-tuning a new system or maintaining an existing one, our valves are built to deliver dependable, long-lasting performance in even the most demanding water purification setups.