This document provides specifications for a manual weir type diaphragm valve used for water, air, and low pressure steam. The valve body and wetted parts are made of food-grade stainless steel or plastic. It has EPDM or Viton seals, controls flow on/off, and can be cleaned without disassembly. Sizes from 15mm to 40mm are available in quantities from 1 to 9 per size, with NPT fittings and varying flow coefficients. Test certificates will be provided to verify materials, factory tests, and valve characteristic curves. The valve must be free of defects.