H - Parker Hannifin - Solutions for the Truck Industry
H - Parker Hannifin - Solutions for the Truck Industry
H - Parker Hannifin - Solutions for the Truck Industry
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VLS<br />
QLF<br />
Features<br />
• Up to 3,000 PSI, 0.5 to 90 GPM.<br />
Specifications<br />
° °<br />
° °<br />
Bulletin HY14-3001/US<br />
Series VLS and QLF<br />
Velocity Check Valves<br />
Effective: February 1, 2004<br />
Supersedes: HY14-2724-B1/US dated July 1, 2003<br />
Cat. No. GPA-5-10 dated 7/91<br />
Description<br />
The <strong>Parker</strong> Series VLS velocity checks protect your hydraulic<br />
system in <strong>the</strong> event of line rupture. These valves return to <strong>the</strong><br />
open position once <strong>the</strong> pressure is equalized.<br />
The VLS valve is a flow sensing, hydraulic check. Flow will<br />
pass through <strong>the</strong> check until <strong>the</strong> designated closing flow is<br />
reached. Then <strong>the</strong> check will close, stopping fur<strong>the</strong>r flow.<br />
The <strong>Parker</strong> Series Series QLF velocity restrictor check valve<br />
provides a lower flow rate if a specific flow rate is exceeded.<br />
These valves return to <strong>the</strong> open position once <strong>the</strong> pressure is<br />
nearly equalized.<br />
The QLF valve is a flow sensing, hydraulic restrictor check.<br />
Flow in <strong>the</strong> closing direction will pass through <strong>the</strong> check until<br />
<strong>the</strong> fusing flow is reached. The check poppet will <strong>the</strong>n close<br />
and reduce <strong>the</strong> flow through a fixed orifice <strong>for</strong> controlled<br />
lowering.<br />
1<br />
<strong>Parker</strong> <strong>Hannifin</strong> Corporation<br />
Hydraulic Valve Division<br />
Elyria, Ohio, USA
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