VENTILBLOCKZUSAMMENBAU.

摘要

A valve block assembly having internal delivery channels and a common outlet channel is provided with two delivery valve surfaces with access to the common channel. The common channel comprises easily cleaned linear sections 26, 126 running alternately from one surface to the other, and connecting surface grooves 25, 125 at the valve sites. Diaphragm valves 19, 20, 21 are provided with relief grooves 4a to accommodate deformation of the diaphragm 5. The V-like cross-section of the connecting grooves 25, 125 of the common channel and the conical shape of the nearby outlet 24a of a delivery channel 24 assure that the valve may be opened by only a small actuating force. Reservoirs 10 feeding the delivery channels 24 have an inert atmosphere controlled by pressurizing and venting channels 22, 23 in the valve block 16, 116. Exposure of plastic tubing to oxygen is kept to a minimum. The assembly is particularly adapted for use in a protein sequencer to supply reactants without cross-contamination or oxidative decomposition.