Product Overview
Cartridge
Description
These unbalanced, pilot-to-close logic valves are 2-way switching elements that are spring biased closed. Pressure at either work port 1 or 2 will oppose the spring and tend to open the valve while pressure at port 3 will tend to close it. The force generated at port 3, plus the spring force, must be greater than the sum of the forces acting at port 1 and port 2 for the valve to remain closed. NOTE: The pilot area (port 3) is 1.8 times the area at port 1 and 2.25 times the area at port 2.
These valves have positive seals between port 2 and the pilot area.
Specifications
Cavity T-11A
Series 1
Capacity 25 gpm
Maximum Operating Pressure 5000 psi
Maximum Valve Leakage at 110 SUS (24 cSt) 10 drops/min.
Pilot Volume Displacement .04 in³
Pilot Passage into Valve .031 in.
Area Ratio, A3 to A1 1.8:1
Area Ratio, A3 to A2 2.25:1
Valve Hex Size 7/8 in.
Valve Installation Torque 30 - 35 lbf ft
Seal kit - Cartridge Buna: 990011007
Seal kit - Cartridge Polyurethane: 990011002
Seal kit - Cartridge Viton: 990011006
Model Weight 0.27 lb.
Features
Because these valves are unbalanced, operation is pressure dependent. Opening and closing of the poppet are functions of the force balances on three areas: Port 1 = 100%, Port 2 = 80%, and the Pilot Area = 180%.
These valves are pressure responsive at all ports, therefore it is essential to consider all aspects of system operation through a complete cycle. Pressure changes at any one port may cause a valve to switch from a closed to an open position, or vice versa. All possible pressure changes in the complete circuit must be considered to assure a safe, functional system design.
Pilot port 3 requires a controlled pressure. A blocked port 3 may result in pressure intensification due to the floating design of the sleeve.
All ports will accept 5000 psi (350 bar).
*Please note that image representation may only represent a product series with particular items. The buyers responsibility is to ensure the product SKU matches their specifications before purchase.
