PRV57
8Pages

Catalog excerpts

ADCA PILOT OPERATED PRESSURE REDUCING VALVES PRV57 and PRS57 DESCRIPTION The ADCA PRV57 pilot operated pressure reducing valves are designed for use with steam, compressed air, nitrogen and other gases compatible with the construction materials. The PRV57 can be installed in pressure reducing stations throughout all industries, and provide sensitive and accurate control even when inlet pressure fluctuations or relevant flow variations occur. MAIN FEATURES Precise control of downstream pressures from 0,07 bar to 17 bar. Robust steel or stainless steel construction. Suitable for dead end conditions. Guided piston and valve stem. Hardened plug. OPTIONS: Soft sealing. Low pressure top. Dome loaded version. Bottom cover drain connection. Stellited plug and seat. Internal sensing line. Saturated steam, compressed air and other gases compatible with the construction (except oxygen). AVAILABLE MODELS: PRV57, PRV57E – steel versions for steam. PRV57i, PRV57iE – stainless steel versions for steam (only available from DN 15 to DN 50). PRV57G, PRV57GE – steel versions for compressed air and gases. PRV57Gi, PRV57GiE – stainless steel versions for compressed air and gases (only available from DN 15 to DN 50). Suffix E: Version with solenoid valve for remote closure. PRS: All models above are available with an optional sustaining valve pilot, e.g. PRS57G (see Fig. 8). Horizontal installation, see IMI – Installation and maintenance instructions. In steam applications, a “Y” strainer, humidity separator and steam trap should be installed upstream of the valve. Standard PN 16 DN 65 flanges are supplied with 4 holes. 8 holes, according to EN 1092-1, on request. CE MARKING – GROUP 2 (PED – European Directive) PN 16 VALSTEAM ADCA We reserve the right to change the design and material of this product without notice.

Open the catalog to page 1

ADCA LIMITING CONDITIONS PRV57 PRV57i Valve model Body design conditions Maximum upstream pressure Maximum downstream pressure Minimum downstream pressure * Maximum operating temperature Maximum reducing ratio Maximum hydraulic factory valve body test 24 bar 60 bar 24 bar 60 bar 24 bar 60 bar * 0,07 bar with low pressure top (limited to 7 bar maximum inlet pressure). Remark: Pressure and temperature limiting conditions may change if “G” version for compressed air and gases is chosen or soft sealing/piston rings are used. REGULATING RANGES SPRING COLOUR Regulating range * With low pressure...

Open the catalog to page 2

ADCA MATERIALS Adapting flange (DN 50 and above) External sensing Internal sensing Detail A Pilot valve Detail A Pilot valve (soft) VALSTEAM ADCA Detail B Main valve (soft) Detail C Optional drain connection We reserve the right to change the design and material of this product without notice.

Open the catalog to page 3

Valve body Pilot valve body Low pressure pilot valve body Adapting flange Spring cover * Main valve seat * Main valve plug * Main valve plug (soft) AISI 316 w/ PTFE/GR; Rulon AISI 316 w/ PTFE/GR; Rulon * Main valve spring Piston guide * Piston Rings Piston liner Bottom cover * Bottom cover gasket Stainless steel / Graphite Stainless steel / Graphite * Diaphragm gasket Stainless steel / Graphite Stainless steel / Graphite * Low press. diaphragm gasket Stainless steel / Graphite Stainless steel / Graphite * Pilot valve gasket Stainless steel / Graphite Stainless steel / Graphite Lower spring...

Open the catalog to page 4

Sensing pipe Copper or stainless steel Copper or stainless steel Solenoid valve Brass or stainless steel ADCA PS7 pressure sustaining valve Carbon steel or stainless steel Drain connection Copper or stainless steel STANDARD VALVE FOR STEAM, COMPRESSED AIR AND OTHER GASES The high pressure upstream gas enters the main valve and the pilot valve. Compression of the regulating spring over the diaphragm causes the pilot valve to open, admitting regulated pressure to the piston chamber. The force exerted by the regulated pressure on top of the piston pushes it down which, in turn, opens the main...

Open the catalog to page 5

ADCA DRAIN CONNECTION The optional drain connection is specially recommended for steam aplications where it is not possible to install a humidity separator close to the valve, when the valve is under no-flow static condition during large periods of time or for system cleaning during start up. VALVE WITH SOLENOID CLOSURE (PRV47E) The PRV57E operates like the standard valve, but it allows remote closure, by means of a switch or timer. When the solenoid valve (103) closes, the pressure signal to the pilot valve is interrupted, causing the main valve to close. TECHNICAL DATA (SOLENOID VALVE)...

Open the catalog to page 6

VALSTEAM ADCA We reserve the right to change the design and

Open the catalog to page 7

ADCA ORDERING CODES PRV57 Valve model PRV57G – compressed air and gases Construction material Carbon steel construction Stainless steel construction Options Standard valve for external sensing connection Valve with internal sensing line Solenoid valve for remote closure and external sensing connection a) Solenoid valve for remote closure with internal sensing line a) Pressure sustaining / reducing for external sensing connection b) Pressure sustaining / reducing with internal sensing line b) Pressure sustaining / reducing / solenoid for external sensing connection a) Pressure sustaining /...

Open the catalog to page 8

PRV57 8Pages

Catalog excerpts

All VALSTEAM ADCA Engineering S.A. catalogs and technical brochures

PRV57
8Pages