EATONAerospace Group TF100-105D May 2013 5 Hose End Control Valves The Hose End Control Valve (HECV) is designed to limit pressure at its outlet (at the pressure sensing port in the nozzle). The control pressure is a function of the main spring that loads the poppet. In addition to limiting pressure at the outlet, surge and lockup (no flow pressure) are also controlled. Refer to Model 60129-1 HECV brochure (TF10076) for more details on how this is accomplished. The following characteristics are typical: yy Normal spring setting (maximum pressure limits will be 5 psi (0.345 bar) greater than spring) — 35 psi (2.413 bar), 45 psi (3.103 bar) and 55 psi (3.792 bar) available yy Surge pressure control — 75 psi (5.171 bar) maximum with 0.5 second valve closure (minimum) yy Lockup pressure — 10 psi (0.689 bar) maximum over spring setting for 45 psi and 55 psi HECVs; 20 psi (1.379 bar) maximum over spring setting for 35 psi unit yy Pressure limitation — 5 psi (0.345 bar) over spring setting with inlet pressure up to 100 psi (6.895 bar) yy Hysteresis (difference in pressure limits between increasing and decreasing flow rates) — pressure limits for decreasing flow rates will normally be slightly greater than for increasing flow rates yy Defueling is possible through unit. However, a blockout device is required to maintain maximum flow — use Eaton’s Model 61656 Blockout Device. yy Model 61656 Blockout Device recommended if system secondary control valve is to be checked The curves presented below are typical for the inlet pressures and flow rates shown in a system with appropriate back pressure. Curve 1 Control pressure with 100 psi (6.895 bar) inlet pressure Curve 2 Control pressure with 90 psi (6.205 bar) inlet pressure Curve 3 Control pressure with 75 psi (5.171 bar) inlet pressure 55 psi HECV 40 (2.758) 40 (2.758) 40 (2.758) 30 (2.068) 30 (2.068) 30 (2.068) 20 (1.379) 20 (1.379) 20 (1.379) 50 (3.448) 50 (3.448) 50 (3.448) 60 (4.137) 60 (4.137) 60 (4.137) 45 psi HECV 1 2 3 35 psi HECV 1 2 3 Outlet Pressure - psi (bar) 1 2 3 100 (378) 200 (757) 300 (1,135) 400 (1,514) 500 (1,892) 600 (2,271) Flow Rate - USgpm (l/min) 100 (378) 200 (757) 300 (1,135) 400 (1,514) 500 (1,892) 600 (2,271) Flow Rate - USgpm (l/min) 100 (378) 200 (757) 300 (1,135) 400 (1,514) 500 (1,892) 600 (2,271) Flow Rate - USgpm (l/min)
RkJQdWJsaXNoZXIy NDE1MjE4