Flow capacity

Main characteristic of control valves is their flow factor K(v). The Graph and the Table contain data figured out by RPC 'Central Valve Engineering Bureau' the data are for DN 200

Hydraulic Analysis CVEB Download

Flow factor DN (Кv)

Relative throttle stroke

Valve typeNominal maximum flow capacity DN 200Control range

Control valve RK-2003490 95

Double-seat control valve1000 1440

Single-seat control valve (full-bore)630 1440

Cage-type single-seat control valve630 500 1440

Disk-type control gate2200 50

Full-bore control ball cock2800 65

Axisymmetric valve (according to 'Mokveld' type)1295 —

Table 1

Comparison of hydraulic characteristics of RK-200 valve with hydraulic characteristics of various types of control valves DN 200

Hydraulic characteristics of different control valves are listed in the Table

Flow part heat-up

We have developed intrinsic heat-up system for flow part of control valves. Conventionally, frozen control valves are dealt with in situ by maintenance engineers by means of improvised materials. Karelin Control Valve can operate at temperatures of up to −60°C without additional modifications.

Reversal of flow direction

Reversal in flow direction in Karelin Valve entails no changes in characteristics of the flow. This function can be engaged not only in case of necessity to change the flow direction but also for blow-down and cleaning of the whole system including the control valve itself. As well as when the control valve is used for balancing of different systems.

Self-cleaning function

Damage to internals of equipment by sand, welding burr, and other foreign inclusions is known issue for control valves of other manufacturers. Our design solution is as follows: the flow part contains no structural elements which could be damaged during operation in an aggressive media.