The Terval is a pilot-controlled regulator for medium and low pressure suitable for use with pre-filtered non-corrosive gases.

This regulator is designed such that the devices listed below are fitted to a single unit :

  • The main pressure regulator;
  • The emergency regulator "monitor";
  • The slam shut valve.

Pilots, valve, seat of these devices are maintained independently.

With this solution it is possible to reduce the dimensions of the pressure reducing unit while maintaining all safety devices at the same time..

The regulator can also be fitted with a built-in silencer without modifying the body..

"Top entry" design allows  easy regular  maintenance without removing the body from the pipeline.

Two versions are available:

  • The TERVAL main regulator is of the fail open type while the monitor is of the  fail close type;
  • TERVAL R both main regulator and monitor are of the fail close type.


Design pressure up to 25 bar
Design temperature -30° +60° C (higher or lower temperatures on demand)
Minimum working differential pressure 0.45 bar
Accuracy class up to 2.5%
Closing pressure class SG up to 5%
Flanging ANSI 150 RF or RTJ according to ANSI B16.5 and PN16/25/40 according to ISO 7005
Outlet pressure range of Wd 5 mbar to 9500 mbar
Available size DN 2"- 2"1/2 - 3" - 4"
Maximum working differential pressure 19
Range of inlet pressure bpu 0.5 to 16 bar

News and articles

26 September 2017

A brief presentation of our modern plant in Desenzano del Garda

A brief presentation of our modern plant in Desenzano del Garda, where our gas pressure regulators are designed, manufactured, tested and shipped around the world.

03 August 2017

Technical Newsletter - Reflux 819 12 "

Reflux 819 12” - Our biggest pilot regulator


Pietro Fiorentini inc.

With each installation created by Pietro Florentini, we increase our experience in the use of new technologies and are improving, which allows us to look to the future with confidence.

We constantly improve our quality and competitiveness, taking into account the highest requirements of our customers.

Our company is a leader in the creation of high-tech equipment and services for the transportation and use of natural gas, which allows us to direct our research to solve all kinds of problems.

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