DRV pressure reducing valves for water, air and gases up to 40 bar

New series Berluto DRV 250, DRV 200 and DRV 225 gunmetal pressure reducing valves with pressure gauge

DRV pressure reducing valves by the manufacturer Berluto reduce the pressure of water, compressed air or a neutral gas from an industrial network – up to 25 or 40 bar – to the set pressure and keep it constant. The body is made of gunmetal, and a pressure gauge is included.

Three versions cover outlet pressures of 0.2 to 20 bar, eight sizes threads from G 1/4" to G 2". The valves are designed for industrial networks – they are not approved for drinking water and are not for steam or flammable gases.

40 barmaximum inlet pressure

0.2–20 baroutlet pressure

8sizes G 1/4" to G 2"

7.2 m³/hkvs of the largest size

Three versions

Choose the version according to the pressure you want to set and the pressure in the network.

Version	Inlet pressure	Outlet	Pressure gauge	Reduction ratio	Control	Spring housing
DRV 250 (low-pressure)	25 bar	0.2–2 bar	0–2.5 bar	20 : 1	diaphragm	gunmetal
DRV 200 (standard)	25 bar	1.5–8 bar	0–10 bar	10 : 1	diaphragm	brass / grey cast iron
DRV 225 (high-pressure)	40 bar	1.5–20 bar	0–25 bar	6 : 1	piston	brass / grey cast iron

The minimum difference between inlet and outlet pressure is 1 bar. Reduction ratio = maximum ratio of inlet to outlet pressure. On DRV 200 and DRV 225, the spring housing of sizes G 1 1/4" to G 2" is made of grey cast iron.

All DRV pressure reducing valves

Code	Thread	Control range	Inlet pressure	kvs (water)	L × H2	Weight
DRV200-14	G 1/4"	1.5–8 bar	25 bar	0.5 m³/h	70 × 165 mm	0.9 kg
DRV200-38	G 3/8"	1.5–8 bar	25 bar	0.6 m³/h	70 × 169 mm	0.85 kg
DRV200-12	G 1/2"	1.5–8 bar	25 bar	1.2 m³/h	85 × 190 mm	1.1 kg
DRV200-34	G 3/4"	1.5–8 bar	25 bar	1.3 m³/h	85 × 190 mm	1.1 kg
DRV200-10	G 1"	1.5–8 bar	25 bar	1.6 m³/h	95 × 242 mm	1.8 kg
DRV200-114	G 1 1/4"	1.5–8 bar	25 bar	4.2 m³/h	104 × 324 mm	4.2 kg
DRV200-112	G 1 1/2"	1.5–8 bar	25 bar	4.5 m³/h	108 × 324 mm	4.3 kg
DRV200-20	G 2"	1.5–8 bar	25 bar	7.2 m³/h	147 × 377 mm	7.0 kg
DRV250-14	G 1/4"	0.2–2 bar	25 bar	0.5 m³/h	70 × 187 mm	1.0 kg
DRV250-38	G 3/8"	0.2–2 bar	25 bar	0.6 m³/h	70 × 187 mm	1.0 kg
DRV250-12	G 1/2"	0.2–2 bar	25 bar	1.2 m³/h	85 × 253 mm	2.5 kg
DRV250-34	G 3/4"	0.2–2 bar	25 bar	1.3 m³/h	85 × 253 mm	2.5 kg
DRV250-10	G 1"	0.2–2 bar	25 bar	1.6 m³/h	95 × 290 mm	4.4 kg
DRV250-114	G 1 1/4"	0.2–2 bar	25 bar	4.2 m³/h	104 × 329 mm	8.0 kg
DRV250-112	G 1 1/2"	0.2–2 bar	25 bar	4.5 m³/h	108 × 329 mm	8.0 kg
DRV250-20	G 2"	0.2–2 bar	25 bar	7.2 m³/h	147 × 380 mm	14.0 kg
DRV225-14	G 1/4"	1.5–20 bar	40 bar	0.5 m³/h	70 × 194 mm	1.2 kg
DRV225-38	G 3/8"	1.5–20 bar	40 bar	0.6 m³/h	70 × 194 mm	1.2 kg
DRV225-12	G 1/2"	1.5–20 bar	40 bar	1.2 m³/h	85 × 228 mm	1.7 kg
DRV225-34	G 3/4"	1.5–20 bar	40 bar	1.3 m³/h	85 × 228 mm	1.7 kg
DRV225-10	G 1"	1.5–20 bar	40 bar	1.6 m³/h	95 × 252 mm	2.7 kg
DRV225-114	G 1 1/4"	1.5–20 bar	40 bar	4.2 m³/h	104 × 362 mm	7.0 kg
DRV225-112	G 1 1/2"	1.5–20 bar	40 bar	4.5 m³/h	108 × 362 mm	6.0 kg
DRV225-20	G 2"	1.5–20 bar	40 bar	7.2 m³/h	147 × 400 mm	10.0 kg

kvs = water flow rate in m³/h at a pressure drop of 1 bar with the valve fully open (manufacturer Berluto). L = length, H2 = overall height (drawing below).

How to choose a DRV pressure reducing valve

Outlet pressure. You set 0.2–2 bar with the low-pressure DRV 250, 1.5–8 bar with the standard DRV 200 and 1.5–20 bar with the high-pressure DRV 225.
Inlet pressure. DRV 200 and DRV 250 withstand 25 bar, DRV 225 40 bar. The inlet must be at least 1 bar higher than the outlet and no more than 10× (DRV 200), 20× (DRV 250) or 6× (DRV 225) higher.
Size according to the flow rate. For water, Q = kvs × √Δp applies: a valve with kvs 1.2 m³/h passes about 2.4 m³/h fully open at a pressure drop of 4 bar. For water, the manufacturer assumes lower flow rates – choose with a reserve.
Thread. The sizes have a female G thread according to ISO 228 – choose it according to the pipework, but check the flow rate against the kvs value.

Example: a cooling water network has 10 bar, a machine needs 4 bar and no more than 25 l/min. At a pressure drop of 6 bar, DRV200-38 (kvs 0.6 m³/h) passes about 24 l/min fully open – with no reserve. With a reserve, DRV200-12 (kvs 1.2 m³/h) is suitable.

Not sure which regulator to choose? Try the pressure regulator selector – based on line pressure, required pressure and flow.

#showmore#

Flow diagram

The manufacturer’s diagram shows how much water flows through the fully open valve at a given pressure drop. At a pressure drop of 1 bar, the flow rate equals the kvs value; at four times the pressure drop it doubles. At your pressure drop, the required flow rate should lie well to the left of the line for the chosen size – during control the valve is not fully open.

What DRV valves are for – and what they are not for

Yes

industrial networks for water and neutral non-sticky liquids (the manufacturer assumes lower flow rates)
compressed air and nitrogen
neutral non-flammable gases
medium temperature −15 to +100 °C, with the supplied pressure gauge up to +60 °C

No

drinking water – the manufacturer does not state approval for drinking water
steam
flammable gases
oxygen – the manufacturer does not state approval

How a pressure reducing valve works

Connection diagram of a DRV pressure reducing valve with outlet pressure gauge — 1 inlet p₁, 2 valve installed according to the arrow on the body, 3 outlet pressure gauge (G 1/4" connection on both sides of the body), 4 adjusting head, 5 outlet p₂. Pressure difference at least 1 bar; maximum inlet pressure and reduction ratio depend on the version. According to the Berluto data sheets.

With the adjusting head you tension the spring, which opens the valve – the medium flows from the inlet to the outlet.
The outlet pressure pushes against the spring on the diaphragm (DRV 225 on the piston). When it reaches the set value, the valve partially closes and lets through only as much as is being drawn off.
The pressure gauge shows the outlet pressure. The G 1/4" pressure gauge connection is on both sides of the body.
The valve has no secondary venting: when you reduce the set pressure, the outlet pressure only drops once medium is drawn off.

Dimensions

L is the length between the connection faces, H1 the height of the pipe axis above the base and H2 the overall height including the adjusting head. The dimensions of all sizes are in the table above and on the page of each valve.

Installation and adjustment

connect the valve according to the arrow on the body; any mounting position is possible, the manufacturer recommends vertical
flush or blow out the pipework before installation – dirt will damage the valve seat
you can move the pressure gauge to the other side of the body – the G 1/4" connection is on both sides
set the pressure with the adjusting head while a small amount is being drawn off, then check it on the pressure gauge
the internal parts are replaceable – for worn seals, there is a seal kit for each version and size

Seal kits

Each valve has its own seal kit according to version and size.

Size	DRV 200	DRV 250	DRV 225
G 1/4"	DRV200-14REP	DRV250-14REP	DRV225-14REP
G 3/8"	DRV200-38REP	DRV250-38REP	DRV225-38REP
G 1/2"	DRV200-12REP	DRV250-12REP	DRV225-12REP
G 3/4"	DRV200-34REP	DRV250-34REP	DRV225-34REP
G 1"	DRV200-10REP	DRV250-10REP	DRV225-10REP
G 1 1/4"	DRV200-114REP	DRV250-114REP	DRV225-114REP
G 1 1/2"	DRV200-112REP	DRV250-112REP	DRV225-112REP
G 2"	DRV200-20REP	DRV250-20REP	DRV225-20REP

Series specifications

Parameter	Value
Inlet pressure	max. 25 bar (DRV 200 and 250), max. 40 bar (DRV 225)
Outlet pressure	1.5–8 bar (DRV 200), 0.2–2 bar (DRV 250), 1.5–20 bar (DRV 225)
Maximum reduction ratio	10 : 1 (DRV 200), 20 : 1 (DRV 250), 6 : 1 (DRV 225)
Minimum pressure difference	1 bar
kvs (water)	0.5 to 7.2 m³/h depending on the size
Connection	G 1/4" to G 2" female thread (ISO 228)
Pressure gauge	⌀ 50 mm included, G 1/4" connection on both sides
Control	diaphragm (DRV 200 and 250), piston (DRV 225)
Secondary venting	no
Medium	water and neutral non-sticky liquids, compressed air, nitrogen, neutral non-flammable gases; not steam
Operating temperature	−15 to +100 °C, with pressure gauge max. +60 °C
Material	body gunmetal CC499K, spring housing brass or grey cast iron (DRV 250 gunmetal), diaphragm and seals NBR/CR
Mounting position	any, preferably vertical
Conformity	Pressure Equipment Directive 2014/68/EU

Ventilek advises

Choose a pressure reducing valve according to the flow rate, not according to the pipe thread. And with water, bear in mind that DRV valves are for industrial networks – they are not for drinking water installations in houses.

compressed air with venting and high flow rate: air pressure regulators
shutting off water, air and gas: ball valves
high pressure from a cylinder or network: high-pressure regulators

Can I use a DRV valve for drinking water?: No. The manufacturer does not state approval for drinking water. DRV valves are for industrial water, air and neutral gas networks.
What is the difference between DRV 200, 225 and 250?: The outlet pressure range and the inlet pressure: DRV 250 sets 0.2–2 bar, DRV 200 1.5–8 bar (both inlet 25 bar) and DRV 225 1.5–20 bar with an inlet of up to 40 bar. DRV 225 controls with a piston, the others with a diaphragm.
How much air does the valve let through?: The manufacturer only specifies kvs for water. For air, when the outlet is below half the inlet (absolute), approximately Q [l/min] ≈ 13.4 × kv [l/min] × p1 [bar abs.] applies. This is an approximate estimate for a fully open valve, not a figure from the manufacturer.
Is the pressure gauge included?: Yes, a ⌀ 50 mm pressure gauge with a scale of 0–10 bar (DRV 200), 0–2.5 bar (DRV 250) or 0–25 bar (DRV 225).
Why must the pressure difference not be less than 1 bar?: The valve needs a pressure drop of at least 1 bar to control. If the inlet is only slightly higher than the set outlet, the valve cannot hold the pressure.

Technical data according to the manufacturer Berluto Armaturen-Gesellschaft (data sheets DRV 200, 225 and 250). The air flow rate is our approximate calculation, not a figure from the manufacturer.

You will find more regulators in the category air pressure regulators.