ACV Ratio Reducing Valve

Specifications

Confirmed at quote

Size Range: 15mm to 300mm
Pressure Class: PN16, PN25, PN40, PN100
End connection: Threaded · Flanged
Operating temperature: max 20°C

Configure your variant(manually adjust box on the right if you require a different spec)

Size
Pressure
End connection

Materials

All available material options per part. Click a pill to set it in the configurator.

Body
Piston
Seal

Dimensions per size(7 sizes)

Size	L (mm)	Weight
50mm	80	—
80mm	110	—
100mm	120	—
150mm	160	—
200mm	200	—
250mm	250	—
300mm	300	—

* L dimension given is for 16bar valves. For higher pressures L is longer by the increased flange thickness.

Operating media

Cold water

Typical applications

Trunk main pressure management
Variable inlet pressure systems
District metered areas
Pressure zone management
Fire protection installations
High-rise building plumbing
Mine shaft pressure reduction

Coatings

Non-ferrous parts UV-protected for outdoor/weathering exposure

Approvals

WRASISO 9001

Features

One-piece direct-acting ratio pressure reducing valve
Inline axial-flow design
Reduces static and dynamic fluid pressure
High flow rates with accurate pressure control
Reduces surge and water hammer
One moving part and only three seals (two O-rings, one main seal), minimum maintenance required
No internal ports to block, and no springs to corrode or become damaged
High cavitation resistance, up to 5:1 ratios available
High range-ability, controls down to very low flow rates
Fast response, near-instantaneous reaction to demand changes
Fixed ratio: no adjustment or calibration, settings cannot drift with time
No external regulators or pilot tubes, so nothing to tamper with or block
Maintains downstream pressure under no-flow conditions until it drops
No control tubing, so no tubing leak path
No air bleed required from the control chamber
Can operate in series with other control valves without instability, avoiding the need for a bypass valve to cover low-flow periods
Seal design protected against flow-velocity wear (patented)
Compact design suited to tight installation spaces, can be installed in any orientation
Servicing typically required every 3 to 5 years, can be handled by one person; service kits (seals and O-rings) are readily available

Description

The ACV ratio reducing valve is a piston inside a body with no external piloting, and cannot be adjusted or tampered with. It reduces an upstream pressure to a downstream pressure in the ratio chosen: for example, a 20 bar inlet reduces to 10 bar on a 2:1 valve, or to 6.7 bar on a 3:1 valve. It operates on the principle of differing piston surface areas: on a 2:1 screwed-ratio valve, the upstream piston surface area is half that of the downstream surface area, and other ratios are obtained by altering that area relationship. Under no-flow conditions the piston closes to ensure the downstream pressure does not exceed the prescribed ratio. This is particularly useful on systems where demand patterns cause large upstream pressure fluctuations, as it avoids the very low outlet pressures that a fixed-set-point PRV would deliver at low inlet pressures. Fully hydraulic, no external power required. Patent 2016/04949.

Selection notes

This pressure reducing valve is supplied for threaded and flanged installation.

Sizes run 15mm to 300mm, in PN16, PN25, PN40, PN100.

The body is offered in Cast iron, WCB Steel and Stainless Steel, so the grade can be matched to the service rather than the other way round.

Stated service media include cold water.

It is catalogued for Water & Wastewater.

Working temperature is max 20°C.

Supplier remarks

An isolating valve is recommended both upstream and downstream for servicing; consider two valves in parallel so one can be removed for servicing while the other stays in service.
A strainer upstream is recommended, though the valve is largely tolerant of dirt particles.
An intermediate 65 bar flanged rating is also offered. It is a working pressure rating, not a standard flange drilling class, so confirm the drilling at quotation.