Controlled proportional valve
First Claim
1. A controlled proportional valve having a main slide valve section containing a main slide valve, said section having means to control a flow of fluid between a pump connection connected to a pump and a tank connection connected to a tank and two work connections connected to a load and which generate a load-sensing signal in dependence on pressures at the work connections, a compensating slide valve section having means to control pressure across the main slide valve section in dependence on the load-sensing signal, and including a control arrangement having means to control pressure of the load-sensing signal to influence actual volume flow and/or actual pressure in the work connections.
5 Assignments
0 Petitions
Accused Products
Abstract
A controlled proportional valve is provided, with a main slide valve section (4) containing a main slide valve, which section controls a flow of fluid between a pump connection (P) connected to a pump (2) and a tank connection (T) connected to a tank (6) and two work connections connected to a load (5) and which generates a load-sensing signal (LSINT) in dependence on the pressures at the work connections (A, B), and with a compensating slide valve section (3) which controls the pressure across the main slide valve section (4) in dependence on the load-sensing signal (LSINT). It is desirable to achieve a more rapid response time in a proportional valve of that kind, wherein the control means should be capable of being retrofitted to existing proportional valves. To that end, a control arrangement (10) which controls the pressure of the load-sensing signal (LSINT) to influence the actual volume flow and/or the actual pressure in the work connections (A, B) is provided.
15 Citations
13 Claims
- 1. A controlled proportional valve having a main slide valve section containing a main slide valve, said section having means to control a flow of fluid between a pump connection connected to a pump and a tank connection connected to a tank and two work connections connected to a load and which generate a load-sensing signal in dependence on pressures at the work connections, a compensating slide valve section having means to control pressure across the main slide valve section in dependence on the load-sensing signal, and including a control arrangement having means to control pressure of the load-sensing signal to influence actual volume flow and/or actual pressure in the work connections.
Specification