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Technical Information - Fig No. 116S


The ‘ROMA’ Type ‘MF’ Pressure Reducing Valve is hydraulically operated, single seated, piston actuated, diaphragm controlled and spring regulated.

Automatically reduces higher and fluctuating inlet pressures to constant outlet pressures regardless of the flow demands.

The diaphragm pilot control closes when the outlet setting is attained allowing inlet pressure via internal passage to build up above piston to close main valve at a rate predetermined by restricting orifice.

The contoured valve plug provides a more gradual closing of the valve when it nears its seat, giving a stable control even at small flows.

Dimensions (mm)

Valve Size 32 40 50
'A' 134 152 178
'B' 65 70 82
'C' 170 180 190
Mass / kg 5 7 9


End Connections 25mm, 32mm, 40mm, 50mm, BSP
Working Pressure Up to 2100 kPa maximum
Adjustable Ranges 20-700 kPa
Temp. Range 80C maximum


Body, Bonnet & Cap Bronze, AS 1565/836B
Spring Stainless Steel
Valve Carrier Brass
'O' Ring Seals Buna-N
Piston 'U' Seal Neoprene
Pilot Valve Brass
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