INTRODUCTION
The NORVAL range of pressure regulators are direct action devices for low and medium pressures, controlled by a diaphragm and counterspring.
They allow a constant downstream pressure to be obtained for whatever variation in the upstream pressure or in the delivery demand within the preset values.
The main specifications of this series of regulators are as follows:

high delivery coefficient Cg;
high regulation precision;
type fail to open;
rapid response;
easy maintenance;
optional slam shut incorporated;
hermetic seal with zero delivery.


MAIN FEATURES
Design pressure: up to 19.2 bar
Operating temperature:-10°C +60°C
Ambient temperature:-20°C +60°C
Max. inlet pressure pemax:

• 16 bar per ND 1" to 3"

• 8 bar per ND 4" to 8"

Range of outlet pressure Wh:

• 8 to 4400 mbar per ND 1" to 4"

• 12 to 1800 mbar per ND 6" to 8"

Accuracy class RG = up to 5
Closing pressure class SG: up to 10
Available size ND: 1" - 1"¼ - 1"½ - 2" - 2"½ - 3" - 4" - 6" - 8"
Flanging: class 150 RF according to ANSI B16.5 and NP16 according to UNI 2282 or DIN 2633.
Modular design of pressure regulator NORVAL allows application of slam shut or device for use as "in line monitor" on the same body without changing the face-to-face dimension. Further more "top entry design" allows an easy periodical maintenance without removing body from pipeline.

SLAM-SHUT VALVE
This is a device which immediately blocks the gas flow (SAV) when, in the event of failure, the downstream pressure increases to reach the set-point, or if actuated manually.

INCORPORATED I-N SLAM-SHUT
I-N Slam shut can be incorporated both on the service regulator and on the in-line monitor. The regulator with the incorporated slam-shut has Cg coefficients equal to 95% of those of the basic regulator.
A further advantage of the incorporated slam-shut valve is that it can be fitted at any time on a previously installed NORVAL without modifying the regulating unit.

The main features of this slam-shut device are:
design pressure 19.2 bar for all the components;
accuracy (AG): ±1% of the pressure set-point for pressure increase; ±5% for pressure decreasing;
internal by-pass;
intervention for over pressure and/or under pressure;
manual push-button control;
possibility of pneumatic or electromagnetic remote control;
reduced overall dimensions;
easy maintenance;
possibility of application of devices for remote signal (contact or inductive microswitches).

NORVAL FUNCTIONING AS MONITOR
The monitor is an emergency regulator which comes into operation in place of the main regulator if, in the event of failure, the latter allows the downstream pressure to reach the monitor set-point.

OPERATION OF THE NORVAL FUNCTIONING AS MONITOR
The NORVAL functioning as an in-line monitor is a regulator which, in addition to the normal version, has a further mobile assembly balancing device which guarantees greater accuracy of the regulated pressure and therefore an equally precise value for the intervention pressure without risk of interference with the main regulator.
This device can be fitted even on a normal regulator which has already been installed.

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