Double block valve 

Parker Instrumentation has published a guide to compact double-block-and-bleed manifolds for connecting process instrumentation. The guide focuses on manifolds with flange interfaces, and on two types of integrated construction that reduce the potential number of leak paths compared with assemblies fabricated from discrete components.

Two types of manifold are detailed: 'monoflanges', and a novel two-piece design called Pro-Bloc. Both allow instruments to be attached to process lines in an efficient space- and weight-saving manner, and with very high integrity thanks to the minimisation of the number of joints required - a characteristic that is further enhanced by options that can also eliminate taper thread connections.

The 20-page guide details the numerous configurations and options available including bore sizes from 10 to 25 mm, construction material, valve type and specification, flange details, and outlet connections. The brochure can be downloaded via: .