Overall dimensions and technical information are provided solely for informative purposes and may be modified without notice Valves and solenoid valves poppet system Series T771 - for compressed air & vacuum in technopolymer - G1" 1 AIR DISTRIBUTION 1 | 241 Series T771 - for compressed air & vacuum in technopolymer - G1" General The range of G1” pilot and solenoid operated poppet valves represents an evolution of the current popular Zama series and of the Series T772-T773 (G1/2"-3/4"). Also for this series the main feature is the technopolimer material used to mould most of its components. The use of this materiel results in a versatile, lightweight and economical valve. This series also has other technical and functional enhancements over the existing range. Firstly, the traditional piston lip seal has been replaced with a rolling diaphragm, thereby eliminating frictional wear and tear to this seal. This series (with the exception of certain vacuum models) also features a seal, which separates port 3 from the piston head. The inclusion of this seal has enhanced the valve’s performance and allows the valve to be used as normally open (a configuration not possible in the Zama series). Solenoid operated valves (both internal and external pilot versions) are fitted with a quick exhaust unit, which reduces the return stroke operating time by 80%. The bulk of the valves in this series use the MP type operator, the exception being internally piloted vacuum models, which use the MV operator. These operators differ from the M2 type in that they have self-tapping mounting screws for use in plastics. Bistable versions are also available, both for air or for vacuum. These valves are fitted with a 3/2 sol-sol valve (instead of the standard pilot valve) fitted with two 15mm 24V Dc microvalves (N331.0A). The ordering code are referring to the solenoid valves with mechanics "MP" or "MV" assembled. Coils are not included and have to be ordered separately (series 300, Section 1, General Catalogue), with the exception of the bistable versions which already include 24V Dc Coils (N331.0A). Coil homologated are available (see 300 Series). Construction characteristics Body, operator and end cover High impact resistant thermoplastic Seals and poppets NBR Diaphragm Oil resistant rubber (NBR) Springs AISI 302 stainless steel Piston and shaft Acetal resin Use and maintenance These valves have a mean life of 10 to 15 million cycles under normal operating conditions. Lubrication is not required for good operation but we recommend good filtration to avoid dirty deposit causing malfunction. Please ensure that the valve is being used according with the manufacturers specification, such as air pressure and temperature. The exhaust port of the distributor has to be protected in a dusty and dirty environment. For these products, according to the construction technique and special application, is not required any maintenance with parts replacement. When necessary it is sufficient to clean the internal parts. When it is used the solenoid valves with internal pilot, either for air or vacuum, inlet flow rate must be equal or higher that the required consumption flow rate. Otherwise is better choose the external pilot version. MINIMUM PILOTING PRESSURE DIAGRAM (Valves for compressed air) PNEUMATIC/SPRING AND EXTERNAL SOLENOID PILOT VERSION 3 3,5 2 2,5 1 1,5 0,5 123456 78910 Actuation pressure (bar) Operating pressure (bar) Normally closed valve 3 3,5 2 2,5 1 1,5 0,5 12345678910 Actuation pressure (bar) Operating pressure (bar) Normally open valve
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