Overview

The Aperval pressure regulator is a pilot-controlled device designed for medium and low pressure gas applications. It features a compact, top-entry design that facilitates easy maintenance and retrofitting. Aperval is primarily a fail-to-open regulator, opening automatically upon diaphragm failure or loss of sensing line connection. It is intended for use with filtered, non-corrosive gases.

Key Features

• Compact design with outstanding turn-down ratio
• High accuracy and very low operating differential pressure
• Low noise operation with optional silencer
• Modular design allowing retrofitting of emergency monitors (PM/182), slam shut valves (SA), and silencers (DB/93)
• Top entry design for easy maintenance and field retrofitting
• Fail-to-open safety feature
• Optional pneumatic or electromagnetic remote control and signal devices

Modular Components and Options

Silencer (DB/93)

Reduces noise levels significantly (dBA). Can be incorporated during manufacture or retrofitted without piping modifications. Incorporation reduces valve flow coefficients (Cg and KG) by approximately 5%.

Slam Shut Valve (SA)

Provides overpressure and underpressure intervention with manual reset and optional remote control. Can be factory installed or retrofitted without modifying the regulator assembly. Incorporation reduces flow coefficients by 5-10% depending on slam shut type.

Monitor Regulator (PM/182)

Emergency regulator integrated into the main regulator body but with independent actuators and pilots. Can be installed at any time without piping changes. Flow coefficients are reduced by about 5% compared to standard versions.

In-line Monitor Options

Installed upstream of the main regulator, either as an identical Aperval regulator set at higher pressure or as a Reval 182 regulator. Combined system flow coefficients are about 20% lower than a single regulator.

M/A Accelerator

Recommended for monitors to enable rapid takeover in case of main regulator failure. Mandatory for safety accessory use per PED directive. It accelerates monitor response by venting gas from the motorization chamber. Set point is typically 0.3 to 0.5 bar above monitor set point.

Technical Specifications

• Design pressure: up to 25 bar (362 psig)
• Design temperature: -10°C to +60°C (standard), -20°C to +60°C (on request)
• Ambient temperature: -10°C to +60°C (standard), -20°C to +60°C (on request)
• Inlet pressure range: 0.5 to 25 bar (7.25 to 362 psig)
• Outlet pressure range: 5 mbar to 9500 mbar (2" w.c. to 137.5 psig), depending on pilot
• Minimum working differential pressure: 450 mbar (6.52 psig)
• Maximum working differential pressure: 19 bar (275.5 psig)
• Accuracy class AC: up to 2.5
• Closing pressure class SG: up to 5
• Available sizes: DN 25 (1") to DN 100 (4")
• Flanging: ANSI B16.5 class 150 RF or RTJ, ISO 7005 PN25/40

Materials

• Body: Cast steel ASTM A216 WCB or ductile iron GS 400-18 ISO 1083
• Head covers: Rolled or forged carbon steel
• Valve seat: Technopolymer
• Diaphragm: Vulcanized rubber
• Seals: Nitrile rubber
• Compression fittings: Zinc-plated carbon steel per DIN 2353

Flow Coefficients (Cg, KG) and Body Shape Factor (K1)

Note: Flow coefficients are used for sizing; actual flow capacity depends on outlet pressure and gas properties.

Pilots and Preregulators

Reflux 819 Pilots (Series 200)

• 204/: Control range 0.3 to 43 bar (4.5 to 623 psig)
• 205/: Control range 20 to 60 bar (290 to 870 psig)
• 207/: Control range 41 to 74 bar (595 to 1073 psig)

Pilot adjustment types include manual (…/A), electric remote (…/D), and pneumatic remote (…/CS).

Preregulators

• R14/A: Self-adjusting with integral filter
• R34/A: Adjustable with integral filter

Pressostatic Devices for Reflux 819

Aperval Series 300 Pilots

• 315: 5 mbar to 100 mbar (2" W.c. to 1.45 psig)
• 31TR: 0.1 to 2 bar (1.45 to 29 psig)
• 320: 0.8 to 9.5 bar (11.6 to 137 psig)

Pilot adjustments available as manual (…/A), electric remote (…/D), and pneumatic remote (…/CS).

Restrictor

AR 100 variable restrictor adjusts regulator response time and includes integral filter. Standard with all 300 series pilots.

Dimensions and Weights

The document provides detailed dimensional tables for various Aperval configurations (standard, with silencer DB/93, with monitor PM/182, with slam shut SA) across sizes DN 25 to DN 100 (1" to 4"). Face-to-face dimensions comply with IEC 534-3 and EN 334 standards. Weights vary by size and configuration, ranging approximately from 20 kg to over 110 kg depending on model and size.

Additional Features and Accessories

• Optional reduced cage and flow-limiting devices
• Steel fittings with single or dual sealing
• Supplementary and dehydrating filters for pilots (CF 14 and CF 14/D)
• F.I.O. Smart unit for remote setting, monitoring, and indirect flow measurement compatible with Reflux 819 and Reval 182

Applications and Usage Notes

Aperval regulators are suitable for gas pressure reduction and control in industrial applications requiring high accuracy, low noise, and safety features. The modular design allows customization and upgrades without major system changes. The fail-to-open feature ensures safety in case of diaphragm failure or sensing line loss. The integrated monitor and slam shut options enhance safety by providing emergency pressure control and shutoff.

Manufacturer Information

Pietro Fiorentini S.p.A.
via E.Fermi 8/10, I-36057 Arcugnano (VI), Italy
Tel: +39 0444 968.511
Fax: +39 0444 960.468
www.fiorentini.com

Note: Data are subject to change without prior notice.