Industrial PENSTOCKS Ltd manufactures a range of floating and decanting arms for penstocks, with options for single or twin float, scum boxes, and constant discharge single or twin orifice plates.

Construction:
• Swivel bend body, swivel bend, swivel bend bracket and sole plate are manufactured in cast iron to BS 1452 Gr. 220 with outlet flange drilled to BS 4504 NP16.
• Swivel bend seals: manufactured from gun metal to BS 1400 LG2.
• Float: manufactured in mild steel and galvanised to BS 729, complete with float plugs to facilitate accurate setting of float level.
• Arm: manufactured in 304/316 stainless steel.

The floating arm is self-operating: when the tank contains water the float will raise or lower the chute to the correct level to allow the fluid to discharge. Usually, an isolating valve will prevent any discharge and is normally fitted to the outlet line.

Floating arms can be either constant discharge or variable discharge. Constant discharge units will draw off a constant flow or volume irrespective of the depth of fluid in the chamber. A variable discharge unit will pass varying flows and volumes depending on the depth of water in the chamber, which changes the head being discharged down the chute.

The floating arm valve should give years of trouble-free operation, providing some simple inspection procedures are adopted.