3-way, 2-position, vent-to-shift diverter valve, normally open

Capacity: 120 gpm480 L/min. | Cavity: T-34A
DSIY : 3-way, 2-position, vent-to-shift diverter valve, normally open
Technical Features [ + ]

This vent-to-shift diverter valve is a 2-position, 3-way cartridge that is normally open from port 3 to port 4. When port 1 is vented, the pressure differential between port 3 and port 1 exceeds the spring force causing the valve to shift, thereby connecting port 3 to port 2.

  • This valve is not bistable; it is capable of modulating between the two positions shown.
  • Vent flow out of port 1 is pressure compensated and is listed in Technical Data.
  • There must be a pressure source at port 3, relative to port 1, to shift the valve.
  • One application of this valve is to be used in pairs to select between 2 motors or pumps.
  • One pilot valve may be used to vent multiple diverter valves if blocking checks are used at port 1 of each diverter. If blocking checks are not used there will be interaction between high and low pressure legs of the circuit.
  • The vent-to-shift function is self cleaning and therefore insensitive to contamination.
  • Hardened spool and sleeve provide consistent and low spool leakage rates and excellent wear characteristics.
  • Incorporates the Sun floating-style construction to minimize the possibility of internal parts binding due to excessive installation torque and/or cavity/cartridge machining variations.
Technical Data [ + ]
Note: Data may vary by configuration. See CONFIGURATION section.
Cavity T-34A
Series 4
Capacity 120 gpm480 L/min.
Maximum Operating Pressure 5000 psi350 bar
Nominal Vent Flow 35 in³/min.0,60 L/min.
Valve Hex Size 1 5/8 in.41,3 mm
Valve Installation Torque 350 - 375 lbf ft474 - 508 Nm
Model Weight 3.30 lb1,50 kg
Seal kit - Cartridge Buna: 990034007
Seal kit - Cartridge Polyurethane: 990034002
Seal kit - Cartridge Viton: 990034006
Performance Curves [ + ]
FAQs [ + ]

Direct-acting valves are used to prevent over pressure, and pilot-operated valves are used to regulate pressure. If you are unsure, use a direct-acting valve. Sun's direct acting valves are very fast, dirt tolerant, stable, and robust. Sun's pilot-operated valves are moderately fast, they have a low pressure rise vs. flow curve, and they are easy to adjust.

There are exactly 250 Sun drops in a cubic inch or 15 in a cc.

Only external seals are serviceable.  Sun offers replacement seal kits for all cartridge models. The applicable kit part number can be found in the product page's Technical Data table or by using our Cartridge Seal Kit search function located under Accessories. Please note: Converting the external seals from one material to another does not ensure fluid compatibility with that material due to the existence of internal seals within the cartridge.
Additional Resources [ + ]