Manual 26815 QuickTrip Electro-Hydraulic Trip Block Assembly
Woodward 16
Flow Coefficient (Cv):
The flow coefficient (Cv) of a valve is defined as the relationship between flow rate (Q), pressure drop
(∆P), and fluid specific gravity (SG). The equation for Cv is shown below. Note: the variables in the Cv
equation must be in the correct units (GPM, psi) for values to be correctly calculated.
!"#
$!%&#'((
Flow Rate Calculation Example:
Calculate minimum flow rate through the QuickTrip with typical, ISO VG32 fluid at 15degC and a trip
header pressure of 10 Bar.
)*+,-
.)/.0-(1#!)
.)*21113"%4/5!!#
6 .)*2
)*+,-
.0-(
6 .27*8-).9
Steady State Leakage
The graphs below show the hydraulic steady-state leakage flow through QuickTrip with 50 °C and 70 °C
hydraulic fluid. Each graph shows the leakage with the Channel A valve open, Channel B valve open,
Channel C valve open and with all valves closed. The worst-case leakage flow through QuickTrip occurs
with the Channel A valve open. The trip system orifice should be sized for this maximum leakage so that
an auto sequence test that trips channel A to an open position will not cause the trip header pressure to
fall below the trip point for the system.
Figure 2-2. QuickTrip Steady State Leakage (50 °C hydraulic oil)
To Next Page
Loading...
Need help?
General
