Changeover devices

Changeover devices route and mix process flows. Used with safety valves, they allow one valve to be isolated and another connected without stopping the process, subject to the engineered arrangement.

Purpose and features

Changeover devices

As the closure moves between seats, either one or both safety valves may be connected to the protected equipment. Inlet and outlet devices may be linked by a chain drive for synchronised operation.

Reference parameters

DN in source table25, 50, 80, 100, 150, 200, 300 mm

PN in source table6, 16, 40, 63, 100, 160 kgf/cm²

TypesПУ — manual operation; ППУ — version for an electric actuator

Hydraulic resistance coefficientNo greater than 3.7, according to the source catalogue

Technical values have been checked against the supplied Ufa Neftemash catalogue. They remain reference information rather than a confirmed current specification. Confirm every DN/PN combination, material, connection, applicable standard and available version against current manufacturer documentation before ordering.

Designations and versions

Designations start with ПУ or ППУ, followed by DN, PN, body material and face-to-face version. Source material codes are 00 — 20Л steel; 01 — 20ГЛ steel; 03 — 12Х18Н9ТЛ steel; 04 — 12Х18Н12М3ТЛ steel. For DN 100 mm and PN 40 kgf/cm², the catalogue describes three face-to-face versions.

Information needed for an enquiry

Specify DN, PN, material, operation, face-to-face dimension, installation arrangement and whether synchronised inlet/outlet operation is needed. The source mentions manufacture to API 6D upon customer request; confirm applicability for the selected product.

Product passports, technical documentation and price lists are available on request.