Direct Acting

Direct-acting pressure reducing valves are used for mechanical control of downstream pressure in systems handling water, neutral liquids, technical gases, compressed air, and steam, without an external actuator or auxiliary power. Operation is based on force balance between the spring, diaphragm or piston, and the outlet pressure, with direct movement of the plug as consumption or inlet pressure changes. This category includes Berluto DRV, Valfonta PRV/VD, Mankenberg DM 555, and Miyawaki RE, REA, REC, and REH series for liquid, gas, and steam service.

Valve selection is based on service medium, inlet pressure, required outlet pressure, pressure reduction ratio, flowrate, Kvs/Cv, temperature, allowable control deviation, and compatibility of sealing materials. In steam systems, correct upstream drainage, a strainer ahead of the valve, prevention of condensate accumulation in the body, and proper sizing are required to limit noise, hunting, and seat erosion. In liquid service, cavitation risk, pulsating flow, and fluid cleanliness should be checked.

Available versions include DIN and ANSI executions, with BSP, NPT, and flanged connections, and pressure ratings PN16, PN20, PN25, PN40, PN63, PN100, Class 150, Class 300, and selected 1.0-1.6 MPa series. Body materials include brass, CW617N, EN-GJS-400-15, cast steel, stainless steel, 1.0619, 1.4404, 1.4408, 1.7357, and GS 17 CrMo 55. As an example, the Valfonta PRV20 covers DN8-DN20, PN40, inlet pressure up to 40 barg, outlet adjustment from 0.2 to 20 barg, and AISI 316L body construction, while Berluto DRV series includes diaphragm and spring-loaded regulators for DN8-DN50, inlet pressure up to 25 bar, and temperatures from -15 to 100 °C in selected versions.

Pressure Reducers Red-Bronze - DRV 2-Series - DRV 200/200 G | Berluto | Philippopoulos s.a.

Pressure Reducers Red-Bronze - DRV 2-Series - DRV 200/200 G | Berluto

Pressure Reducers Red-Bronze - DRV 2-Series - DRV 200/200 G | Berluto
Berluto
Berluto DRV 200 / DRV 200 G Direct Acting Pressure Reducer The Berluto DRV 200 / DRV 200 G is a diaphragm, spring-loaded, single-seat pressure reducer without pressure relief. Adjustment is mechanically achieved via the spring and outlet pressure, requiring no auxiliary energy or impulse line. Primarily designed for compressed air and neutral gases, it...
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Pressure Reducers Red-Bronze - DRV 2-Series - DRV 225/226 G | Berluto | Philippopoulos s.a.

Pressure Reducers Red-Bronze - DRV 2-Series - DRV 225/226 G | Berluto

Pressure Reducers Red-Bronze - DRV 2-Series - DRV 225/226 G | Berluto
Berluto
Berluto DRV 225 / DRV 226 G High Pressure Reducing Valve The Berluto DRV 225 / DRV 226 G is a direct-acting, spring-loaded, single-seat pressure reducing valve without pressure relief. It is used for local pressure reduction in compressed air networks, neutral gases, and, in smaller flows, water or neutral liquids. Technical Data DN8–DN50. Internal...
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Pressure Reducers Red-Bronze - DRV 2-Series - DRV 230/230 G | Berluto | Philippopoulos s.a.

Pressure Reducers Red-Bronze - DRV 2-Series - DRV 230/230 G | Berluto

Pressure Reducers Red-Bronze - DRV 2-Series - DRV 230/230 G | Berluto
Berluto
Berluto DRV 230 / DRV 230 G Direct Acting Pressure Reducer The Berluto DRV 230 / DRV 230 G is a diaphragm, spring-loaded, single-seat pressure reducer without pressure relief function. Adjustment is achieved through the balance of downstream pressure and spring preload, without an external actuator or impulse line. This series is primarily intended for...
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Pressure Reducers Red-Bronze - DRV 2-Series - DRV 235 | Berluto | Philippopoulos s.a.

Pressure Reducers Red-Bronze - DRV 2-Series - DRV 235 | Berluto

Pressure Reducers Red-Bronze - DRV 2-Series - DRV 235 | Berluto
Berluto
Berluto DRV 235 Direct-Acting Pressure Reducer The Berluto DRV 235 is a piston-operated, spring-loaded single-seat pressure reducer without a relief function. The outlet pressure acts on the internal piston, balancing with the spring preload, adjusting the valve opening without auxiliary energy or impulse line. It is intended for local pressure reduction...
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Pressure Reducers Red-Bronze - DRV 2-Series - DRV 250 | Berluto | Philippopoulos s.a.

Pressure Reducers Red-Bronze - DRV 2-Series - DRV 250 | Berluto

Pressure Reducers Red-Bronze - DRV 2-Series - DRV 250 | Berluto
Berluto
Berluto DRV 250 Low Output Pressure Regulator The Berluto DRV 250 is a direct-acting pressure regulator with diaphragm control, adjustment spring, and single seat. It does not feature a pressure relief function. The downstream pressure acts on the diaphragm and balances with the spring preload, adjusting the valve opening without auxiliary energy or...
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Pressure Reducers Red-Bronze - DRV 3-Series - DRV 302/303/308 | Berluto | Philippopoulos s.a.

Pressure Reducers Red-Bronze - DRV 3-Series - DRV 302/303/308 | Berluto

Pressure Reducers Red-Bronze - DRV 3-Series - DRV 302/303/308 | Berluto
Berluto
Berluto DRV 302 / 303 / 308 Direct Acting Pressure Reducers The Berluto DRV 302 / 303 / 308 series are diaphragm-operated pressure reducers with a regulating spring and inlet pressure compensation. Suitable for water and neutral, non-sticky liquids, they can also be used with air or neutral gases when higher flow rates are required. For potable or...
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Pressure Reducers Red-Bronze - DRV 3-Series - DRV 302-6/303-6 | Berluto | Philippopoulos s.a.

Pressure Reducers Red-Bronze - DRV 3-Series - DRV 302-6/303-6 | Berluto

Pressure Reducers Red-Bronze - DRV 3-Series - DRV 302-6/303-6 | Berluto
Berluto
Berluto DRV 302-6 / DRV 303-6 Pressure Reducers for Potable Water The Berluto DRV 302-6 and DRV 303-6 are direct-acting pressure reducers with diaphragm control, adjustment spring, and inlet pressure compensation. The cartridge design allows for internal part replacement without changing the entire body. They are intended for potable water circuits....
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Pressure Reducers Red-Bronze - DRV 3-Series - DRV 324/325 | Berluto | Philippopoulos s.a.

Pressure Reducers Red-Bronze - DRV 3-Series - DRV 324/325 | Berluto

Pressure Reducers Red-Bronze - DRV 3-Series - DRV 324/325 | Berluto
Berluto
Berluto DRV 324 / DRV 325 High-Pressure Reducing Valves The Berluto DRV 324 / 325 are direct-acting pressure reducing valves, piston-controlled, featuring a regulating spring and inlet pressure compensation. The cartridge design allows for internal component replacement without body removal. Suitable for water and neutral, non-sticky fluids; also...
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Pressure Reducers Red-Bronze - DRV 3-Series - DRV 350 | Berluto | Philippopoulos s.a.

Pressure Reducers Red-Bronze - DRV 3-Series - DRV 350 | Berluto

Pressure Reducers Red-Bronze - DRV 3-Series - DRV 350 | Berluto
Berluto
Berluto DRV 350 Low Output Pressure Regulator The Berluto DRV 350 is a direct-acting pressure regulator, controlled via diaphragm, featuring a setting spring and inlet pressure compensation. Its cartridge design allows for the replacement of internal components without changing the body. It is intended for low downstream pressures in water and neutral,...
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Pressure Reducers Red-Bronze - DRV 3-Series - DRV 372/373/378 | Berluto | Philippopoulos s.a.

Pressure Reducers Red-Bronze - DRV 3-Series - DRV 372/373/378 | Berluto

Pressure Reducers Red-Bronze - DRV 3-Series - DRV 372/373/378 | Berluto
Berluto
Berluto DRV 372 / 373 / 378 Direct-Acting Pressure Reducers The Berluto DRV 372 / 373 / 378 series are diaphragm-controlled pressure reducers featuring a regulating spring, single seat, and inlet pressure compensation. The cartridge design allows for internal component replacement without removing the body. Suitable for water and neutral, non-sticky...
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Pressure Reducers Red-Bronze - DRV 4-Series - DRV 402/403/408 | Berluto | Philippopoulos s.a.

Pressure Reducers Red-Bronze - DRV 4-Series - DRV 402/403/408 | Berluto

Pressure Reducers Red-Bronze - DRV 4-Series - DRV 402/403/408 | Berluto
Berluto
Berluto DRV 402 / 403 / 408 Direct Acting Pressure Reducers The Berluto DRV 402, DRV 403, and DRV 408 are diaphragm, spring, and inlet pressure compensated pressure reducers. The outlet pressure acts on the diaphragm, balancing with the spring setting, moving the internal cartridge without external energy or impulse line. This series is suitable for...
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Pressure Reducers Red-Bronze - DRV 4-Series - DRV 402-6/403-6 | Berluto | Philippopoulos s.a.

Pressure Reducers Red-Bronze - DRV 4-Series - DRV 402-6/403-6 | Berluto

Pressure Reducers Red-Bronze - DRV 4-Series - DRV 402-6/403-6 | Berluto
Berluto
Berluto DRV 402-6 / DRV 403-6 Pressure Reducers for Potable Water The Berluto DRV 402-6 and DRV 403-6 are direct-acting pressure reducers featuring diaphragm, spring, and inlet pressure compensation. Adjustment is achieved through the balance of downstream pressure and spring preload, without auxiliary energy or impulse line. Designed for potable water,...
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Pressure Reducers Red-Bronze - DRV 4-Series - DRV 424/425 | Berluto | Philippopoulos s.a.

Pressure Reducers Red-Bronze - DRV 4-Series - DRV 424/425 | Berluto

Pressure Reducers Red-Bronze - DRV 4-Series - DRV 424/425 | Berluto
Berluto
Berluto DRV 424 / DRV 425 High Output Pressure Reducers The Berluto DRV 424 / 425 are direct-acting, piston-operated pressure reducers with a regulating spring, single seat, and inlet pressure compensation. The cartridge design allows for replacement of internal components without replacing the body. They are intended for water and neutral, non-sticky...
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Pressure Reducers Red-Bronze - DRV 4-Series - DRV 450 | Berluto | Philippopoulos s.a.

Pressure Reducers Red-Bronze - DRV 4-Series - DRV 450 | Berluto

Pressure Reducers Red-Bronze - DRV 4-Series - DRV 450 | Berluto
Berluto
Berluto DRV 450 Low Output Pressure Reducer The Berluto DRV 450 is a direct-acting pressure reducer, membrane-controlled, featuring a regulating spring and inlet pressure compensation. Its operation relies on the balance between downstream pressure and spring preload, without auxiliary energy or impulse line. The cartridge design allows for replacement of...
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Pressure Reducers Red-Bronze - DRV 4-Series - DRV 472/473/478 | Berluto | Philippopoulos s.a.

Pressure Reducers Red-Bronze - DRV 4-Series - DRV 472/473/478 | Berluto

Pressure Reducers Red-Bronze - DRV 4-Series - DRV 472/473/478 | Berluto
Berluto
Berluto DRV 472 / 473 / 478 Direct Acting Pressure Reducers The Berluto DRV 472, 473, and 478 are diaphragm, spring, and inlet pressure compensated pressure reducers. The downstream pressure acts on the diaphragm, adjusting the position of the internal cartridge without external energy or impulse line. The body is made of red bronze CC499K, and...
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Pressure Reducers Red-Bronze - DRV 5-Series - DRV 502/508 | Berluto | Philippopoulos s.a.

Pressure Reducers Red-Bronze - DRV 5-Series - DRV 502/508 | Berluto

Pressure Reducers Red-Bronze - DRV 5-Series - DRV 502/508 | Berluto
Berluto
Berluto DRV 502 / 508 Flanged Type Pressure Reducers The Berluto DRV 502 / 508 are direct-acting pressure reducers, controlled via diaphragm, with a regulating spring and inlet pressure compensation. The downstream pressure acts on the diaphragm, adjusting the position of the single seat without external energy or impulse line. The design with replaceable...
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Pressure Reducers Red-Bronze - DRV 5-Series - DRV 502-6 | Berluto | Philippopoulos s.a.

Pressure Reducers Red-Bronze - DRV 5-Series - DRV 502-6 | Berluto

Pressure Reducers Red-Bronze - DRV 5-Series - DRV 502-6 | Berluto
Berluto
Berluto DRV 502-6 Pressure Reducer for Potable Water The Berluto DRV 502-6 is a flanged direct-acting pressure reducer designed for potable water networks. Its operation is based on a diaphragm, adjustment spring, and inlet pressure compensation. Internal components are cartridge-type, allowing replacement during maintenance without changing the body....
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Pressure Reducers Red-Bronze - DRV 5-Series - DRV 524/525 | Berluto | Philippopoulos s.a.

Pressure Reducers Red-Bronze - DRV 5-Series - DRV 524/525 | Berluto

Pressure Reducers Red-Bronze - DRV 5-Series - DRV 524/525 | Berluto
Berluto
Berluto DRV 524 / DRV 525 Flanged Pressure Reducers The Berluto DRV 524 and DRV 525 are direct-acting, piston-operated pressure reducers with a regulating spring, single seat, and inlet pressure compensation. The design with replaceable internal parts allows maintenance without replacing the body. Technical Specifications DN15–DN80. Flanges according to...
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Pressure Reducers Red-Bronze - DRV 5-Series - DRV 550 | Berluto | Philippopoulos s.a.

Pressure Reducers Red-Bronze - DRV 5-Series - DRV 550 | Berluto

Pressure Reducers Red-Bronze - DRV 5-Series - DRV 550 | Berluto
Berluto
Berluto DRV 550 Low Output Pressure Reducer The Berluto DRV 550 is a flanged direct-acting pressure reducer with diaphragm, adjustment spring, single seat with inlet pressure compensation, and cartridge-type internal components. It is designed for low downstream pressure of 0.2–2 bar, without external energy or pulse line. Technical Specifications...
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Pressure Reducers Red-Bronze - DRV 5-Series - DRV 572/578 | Berluto | Philippopoulos s.a.

Pressure Reducers Red-Bronze - DRV 5-Series - DRV 572/578 | Berluto

Pressure Reducers Red-Bronze - DRV 5-Series - DRV 572/578 | Berluto
Berluto
Berluto DRV 572 / 578 Flanged Connection Pressure Reducers The Berluto DRV 572 and DRV 578 are direct-acting pressure reducers featuring a diaphragm, adjustment spring, single seat, and inlet pressure compensation. The downstream pressure acts on the diaphragm, adjusting the internal cartridge position without external energy or impulse line. Technical...
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Pressure Reducers Red-Bronze - DRV 6-Series - DRV 602/608 | Berluto | Philippopoulos s.a.

Pressure Reducers Red-Bronze - DRV 6-Series - DRV 602/608 | Berluto

Pressure Reducers Red-Bronze - DRV 6-Series - DRV 602/608 | Berluto
Berluto
Berluto DRV 602 / 608 Flanged Connection Pressure Reducers The Berluto DRV 602 and DRV 608 are direct-acting pressure reducers featuring a diaphragm, adjustment spring, single seat, and inlet pressure compensation. Downstream pressure is mechanically adjusted without external energy or impulse line. This series accommodates larger DN compared to smaller...
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Pressure Reducers Red-Bronze - DRV 6-Series - DRV 602-6 | Berluto | Philippopoulos s.a.

Pressure Reducers Red-Bronze - DRV 6-Series - DRV 602-6 | Berluto

Pressure Reducers Red-Bronze - DRV 6-Series - DRV 602-6 | Berluto
Berluto
Berluto DRV 602-6 Pressure Reducing Valve for Potable Water The Berluto DRV 602-6 is a flanged direct-acting pressure reducing valve designed for higher flow rates of potable water. It features a diaphragm, spring, and inlet pressure compensation for adjustment, eliminating the need for an external actuator or impulse line. The valve is single-seated,...
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Pressure Reducers Red-Bronze - DRV 6-Series - DRV 624 | Berluto | Philippopoulos s.a.

Pressure Reducers Red-Bronze - DRV 6-Series - DRV 624 | Berluto

Pressure Reducers Red-Bronze - DRV 6-Series - DRV 624 | Berluto
Berluto
Berluto DRV 624 Flanged Connection Pressure Reducer The Berluto DRV 624 is a direct-acting, piston-operated, spring-loaded pressure reducer with inlet pressure compensation. The downstream pressure is mechanically adjustable within the range of 4–12 bar, requiring no external energy or impulse line. It is designed for large DN and relatively high outlet...
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Pressure Reducers Red-Bronze - DRV 6-Series - DRV 672/678 | Berluto | Philippopoulos s.a.

Pressure Reducers Red-Bronze - DRV 6-Series - DRV 672/678 | Berluto

Pressure Reducers Red-Bronze - DRV 6-Series - DRV 672/678 | Berluto
Berluto
Berluto DRV 672 / 678 Flanged Connection Pressure Reducers The Berluto DRV 672 and DRV 678 are direct-acting pressure reducers, featuring diaphragm control, adjustment spring, single seat, and inlet pressure compensation. They are utilized in larger DN applications where low to medium downstream pressure regulation is required for water or neutral fluids....
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