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ST M3200 ENG STA R2 03/17

M3200: PRESSURE SUSTAINING / RELIEF VALVE

Pressure sustaining/relief control valves maintain a constant upstream pressure (valve inlet) by relieving ex-

cess pressure.

SUSTAINING APPLICATION - The valve is installed on a distribution line between two pressure zones. If de-

mand on the lower zone causes a drop in upper zone pressure, the pressure is sustained at a preset mini-

mum. When this occurs the pressure available to the downstream zone is reduced.

RELIEF APPLICATION - The valve is installed to relieve excess pressure from a source. In a typical installa-

tion the valve diverts excess flow/pressure to atmosphere, a storage tank, or back to a pump intake.

ADDITIONAL FEATURES AVAILABLE:

solenoid on-off control function - a remote controller switches the valve on-off;

check function - if outlet pressure rises higher than inlet pressure, backflow is prevented;

reverse flow - the main valve opens fully if outlet pressure is higher than inlet pressure;

low pressure shut-off with manual reset;

two adjustable pressure outlet values - switching can be by manual override, or remote electrical sole-

noid control;

flow rate control;

on-off float device level control;

constant level float control valve;

booster pump control valve with check.

OPERATING PRINCIPLE

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ST M3200 ENG STA R2 03/17

M3200 CIRCUIT LAYOUT

ITEM DESCRIPTION MATERIAL

1 Main valve GJS400-15 EN1563

2 (a,b) Isolating ball valve Ni-plated Brass

3 Y - Strainer with calibrated orifice 1.4401 EN10088-3 + Brass

4 Monodirectional needle valve 1.4401 EN10088-3 + Brass

5 Pressure relief / sustaining pilot CM200 1.4401 EN10088-3 + Brass

6 Isolating ball valve Ni-plated Brass

7 Position indicator with manual venting cock Brass + Hardened glass

8 Gauge holder with drainage Ni-plated Brass

9 Pressure gauge 1.4301 EN10088-3 + Glycerine

-- Pipe 1.4401 EN10088-3

-- Fittings 1.4401 EN10088-3

-- Pressure unions 1.4401 EN10088-3 + Brass

9

8

7

6

5

4

3

2b

1

2a

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ST M3200 ENG STA R2 03/17

Critical user

Pressure relief valve to protect upstream hydraulic network.

Pressure sustaining valve suit-able for maintaining a minimum

pressure for a critical user.