316 L STAINLESS STEEL PNEUMATIC HIGH/LOW PRESSURE TOP WORKS - THE MECHANISM THAT AUTOMATICALLY OPENS AND CLOSES A WEIR DIAPHRAGM VALVE. VARIOUS SIZES POSSIBLE - FROM 1/2" UP TO 6". IT IS ATTACHED TO THE VALVE BODY BY BOLTS. THE TOP WORKS IS CONTROLLED VIA PNEUMATIC HIGH/LOW CONTROLLED PRESSURE. THE PROCESS USES COMPRESSION SPRINGS TO APPLY PRESSURE ONTO THE DIAPHRAGM WHICH FORMS A SEAL WITHIN THE VALVE BODY. IT IS USED IN BIOTECHNOLOGICAL, PHARAMACEUTICAL, FOOD & BEVERAGE PROCESS SYSTEMS.

GIR'S 1 & 6 THE HARMONISED SYSTEM EXPLANATORY NOTES TO 8481 HSEN NOTE 2(B) TO SECTION XVI THE TEXT TO TARIC CODE 8481 90 00 90