DeZURIK
RCV Rotary Control Valves
D10361
Page 4
June 2017
Description
The RCV Rotary Control Valve is a quarter-turn control valve for corrosive and abrasive liquids, gases
and slurries. A choice of materials, actuators, and accessories is available.
Handling
Lifting the valve improperly may damage it. Do not fasten lifting devices to the
actuator, plug or through
the seat opening in the body. Lift the valve with
slings, chains or cables fastened around the valve
body, or fastened to bolts or
rods through bolt holes in the flanges.
Installing Valve
Install the valve with self-centering flat ring gaskets and ANSI flanges. Use either Class 150 or Class
300 flanges, as designated above “CWP” on the valve data plate. Before installation, remove foreign
material such as weld spatter, oil, grease, and dirt from the valve, flanges, and pipeline.
Refer to the Installation Tag attached to the valve for correct installation of valve in pipeline.
Close the valve, align the pipeline on both sides of the valve, and ensure that the flanges, gaskets and
valve are centered before tightening the flange bolts or studs. Tighten the bolts or studs evenly, in a
crisscross pattern.
Operation
Clockwise rotation of the valve shaft closes the plug in the valve. The plug is the closure member of
the valve. As the plug rotates, a variable orifice is formed with the circular seat in the body. The valve
actuator is connected to the valve shaft, and positions the plug at the open, closed, and intermediate
positions.
The valve is fully closed when the plug touches the seat, and the valve is fully open when the plug is 90
degrees counterclockwise from the closed position. The open and closed positions are determined by
the actuator. Refer to the Actuator Instructions for adjusting the open position stop. A line is stamped
on the top of the valve stem to indicate the angular position of the plug when the plug is not visible.
Refer to the top view of the shaft shown in Figure 2.
Required Tools
This valve is assembled using only SAE fasteners. To service this unit, you should have a full set of
combination wrenches, Allen wrenches, a flat tipped screwdriver, a punch and a dead blow hammer.
Lubrication
The valve does not require lubrication except when it is being assembled. Refer to the actuator
instructions for actuator lubrication requirements.
Adjusting Packing
The shaft seal consists of packing in the packing chamber of the body. The packing is contained and
compressed by the packing gland. If the packing leaks, tighten the adjustment nuts (A8) on top of the
packing gland (A9), shown in Figure 2. Tighten the nuts evenly and gently, just enough to stop the
leakage. Over-tightening will cause excessive operating forces, and will decrease the life of the
packing.
