PRESSURE REGULATOR REFLUX 819
PRESSURE REGULATOR REFLUX 819
PRESSURE REGULATOR REFLUX 819

INTRODUCTION
REFLUX 819 is pilot-controlled pressure regulator for medium and high pressure.
These regulators are suitable for use with previously filtered, non corrosive gases.


MAIN FEATURES

Design pressure: up to 100 bar.
Operating temperature: -10C +50C (lower and upper temperature available on request).
Ambient temperature: -20C +60C.
Range of inlet pressure bpe: 0.5 to 85 bar.
Range of outlet pressure Wh: 0.3 to 60 mbar (depending on installed pilot).
Minimum working differential pressure: 0,5 bar.
Accuracy class RG: up to 1.
Closing pressure class SG: from 3 to 1 depending on outlet pressure.
Available size DN: 1" - 2" - 3" - 4" - 6" - 8" - 10".
Flanging: class 150-300-600 RF or RTJ according to ANSI B16.5 and PN16 according to UNI 2282 or DIN 2263.

REFLUX 819

Modular design of pressure regulators REFLUX 819 allows application of an emergency monitor "fail to close" PM 819 or a slam shut and silencer on the same body without changing the face-to-face dimensions also after the installation of regulator.
Furthermore "top entry design" allows an easy periodical maintenance without removing body from pipeline.

PILOT SYSTEM
- Pilots
REFLUX 819 regulators are equipped with pilot series 200 as below listed:
- 204/. set pressure range Wh: 0.3 to 43 bar;
- 205/. set pressure range Wh: 20 to 60 bar;
Pilots may be adjusted manually or by remote control.
- Preregulator
Pilot system must be completed with preregulator separated from pilot.
Below listed preregulators are available:
- R14 not adjustable; the feeding pressure to pilot is self increased;
- R34 with adjustable set point (Wh: 1.2 to 45 bar).
Both these regulators are equipped with incorporated filter.
- Accessory
Pilot system may be completed with below listed accessory:
- supplementary filter CF14;
- deydrator filter;
- relief valve VSFI (employed with R34 preregulator);
- devices for flow limitation.


INCORPORATED SILENCER DB 819
This device permits a considerable reduction in the level of noise produced by the gas pressure reducing whenever it may be a problem because of particular conditions.
The REFLUX 819 pressure regulator can be supplied with an incorporated silencer in both the standard version, with slam shut or with emergency monitor.
The incorporated-silencer model, like the one with the emergency monitor or slam shut, has the advantage that it can be added to any REFLUX 819 already installed without needing to alter the piping.
With built-in silencer the Cg valve coefficient is only slightly lower than the corresponding version without silencer.
The pressure reduction and adjustment method is the same as for the normal regulator.

Model with incorporated silencer

MONITOR
The monitor is an emergency regulator which comes into operation if main regulator allows downstream pressure to increase up to monitor set pressure.
To fulfil these requirements two alternative solutions may be introduced: an incorporated monitor or an in-line monitor.


PM 182 SERIES INCORPORATED MONITOR
In this case the emergency regulator (monitor) is directly assembled to the body of main regulator.

Model with incorporated monitor

Both pressure regulators, therefore, use same valve body but:
- they are governed by two different pilots and by separate servomotors;
- they operate on different valve seats on same body.
The Cg/KG coefficients of the system composed by:
- REFLUX 819;
- PM 819 incorporated monitor are approximately 93% of standard REFLUX 819 coefficients.
A big advantage of described solution is that application of the PM 819 incorporated monitor can be done on a standard REFLUX 819 already installed, without any alternations to the pipeline.


IN LINE MONITOR
In this solution, the monitor is installed upstream main regulator.
Though they have different functions, the two devices are virtually identical from the point of view of their mechanical components and sealing organs.
The monitor only has a higher pressure setting than the main regulator.
The Cg and KG coefficients of the regulator system with in-line monitor are about 20% lower than for the regulator alone.


M/A ACCELERATOR
When as monitor the regulator REFLUX 819 or incorporated monitor PM 819 are used, the response time of monitor, due to faulty operation of main regulator, can be accelerated by installing the M/A accelerator on the emergency regulator.
Based on downstream pressure signal, this device exhaust gas from monitor motorization chamber allowing a more rapid intervention of monitor.
M/A accelerator setting must be higher than monitor's one by 0.3 to 0.5 bar.


SLAM SHUT
This device immediately stops gas flow (SAV) if downstream pressure rises up its pressure set. This device can also be activated pressing a push button.


INCORPORATED SLAM SHUT SB 82
SB 82 can be incorporated on monitor or on main REFLUX 819 regulator.
The Cg/KG coefficients of the system composed by:
REFLUX 819;
SB 82 incorporated slam shut.
Are about 93% of standard REFLUX 819 coefficients.
Application of the SB 82 slam shut can be done to the REFLUX 819 regulators already installed without any alternations to the pipeline.
Main characteristics of this device are:
accuracy: (AG) 0.5 on the value of the pressure setting;
intervention on pressure increase and/or decrease;
manual push-button control;
option for pneumatic or electromagnetic remote control;
manual re-setting with internal by-pass activated by the manoeuvering lever;
small overall size;
easy maintenance;
possibility of application of devices for intervention remote signal (contact switches or proximity switches).


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