044 Compatibility of face-to-face dimensions Both valve face-to-face dimensions and body face-to-face dimensions are compatible between type 21α and conventional type 21. Also, a change to type 21α is available using the end connector and union nut for the existing piping (type 21). Compatibility of parts Some of the body component parts are not compatible between type 21α and type 21. Be careful when parts are changed on site. For details of parts compatibility, contact our sales office in your area. Identification of product [Difference between products] (See Fig. 1.) The body appearance of type 21α is different from that of type 21 to discriminate between them. Related materials Due to the modification and release of type 21α, some parts of related materials, such as outline drawing, instruction manual, and set parts list, have been revised. Please obtain the latest version at our sales office in your area. Performance and options There is no change in the performance (relationship between the working pressure and temperature, Cv value, chemical resistance, etc.) and options between type 21 and 21α. V ACTUATION ＊＊ TYPE LV OPERATING SYSTEM ＊ BODY MATERIAL ＊ SEAL MATERIAL ＊ CONNECTION ＊ STANDARD ＊＊＊ SIZE U U-PVC C C-PVC P PP F PVDF E EPDM V FKM S SOCKET N THREADED P SPIGOT F FLANGED J JIS D DIN A ANSI 1 JIS10K 5 5K 21 TYPE 21 2A TYPE 21α 015 15mm . 100 100mm V MANUAL VALVE LV LEVER TYPE A ACTUATION ＊＊ TYPE ＊ ACTUATOR TYPE ＊ ACTION / POWER SOURCE ＊ BODY MATERIAL ＊ SEAL MATERIAL ＊ CONNECTION ＊ STANDARD ＊＊＊ SIZE U U-PVC C C-PVC P PP F PVDF E EPDM V FKM S SOCKET N THREADED P SPIGOT F FLANGED J JIS D DIN A ANSI 1 JIS10K 5 JIS5K 21 TYPE 21 2A TYPE 21α PNEUMATIC F DOUBLE ACTING G AIR TO OPEN S AIR TO CLOSE ELECTRIC 1 Single-Phase 100V 2 Single-Phase 200V PNEUMATIC K TYPE TA A TYPE AA ELECTRIC T TYPE T 0C※ SPACE HEATER 015 15mm . 100 100mm A AUTOMATIC VALVE 0C 0C * Indicate only for electric type only. (1) PP and PVDF socket types are weld type. Note, however, that JIS PP 32-mm socket type is not produced. (2) PVDF socket type compatible with the JIS standard is not available. (3) A handle set with a lock mechanism (for malfunction prevention) is available as an option. NOTE TYPE 21 FRONT VIEW BOTTOM VIEW TYPE 21α Fig. 1: Difference between products AUTOMATIC PRODUCT MODEL CODE LIST MANUAL PRODUCT MODEL CODE LIST 1 HIGH PURITY SERIES 1 LUBRICANT FREE 1 LUBRICANT FREE 1 HIGH PURITY SERIES