Flomatic control valves

Flo-Trol automatic flow control valves are designed to give constant flow over wide pressure ranges. The valve design has no moving parts, rather a self-cleaning flexible orifice that varies in size with applied pressure so that a constant flow is maintained, the company explains. Flow rates are maintained to within +/- 15% between 15 and 125 psi. Flomatic Valves. www.flomatic.com