SERIES 34 -- GENERAL INFORMATION
The Brand, Series 34 Sectional Directional Control Valves are assembled to meet our customer’s
requirements for up to twelve individual applications per assembly. Brand Hydraulics does not charge
anything extra for this process and assembly is priced solely on the overall sum of the prices of its
components.
When assembled in their normal manner the series 34 spool sections are in parallel. When the spools are in
neutral position the flow passes by each spool and then onto the tank (outlet) port. If two or more spools
are shifted simultaneously their work ports are in parallel, and the oil flow will take the path of least
resistance allowing lighter loads to move first. All spool sections are cast with metering notches, and have
a high “handle vs. spool” movement ratio, resulting in good metering capability. Input flow can be divided
among several circuits (spool sections) by feathering the spools. Series 34 spool sections may also operate
in series by installing a series block in between each spool section. Please note that when using series
blocks in an assembly it is necessary to use a drain block immediately after the inlet in order for the inlet’s
relief to function correctly.
INLETS – can be provided with no relief, with a adjustable ball spring relief, or with an adjustable areadifferential
cartridge relief. Standard inlets are field convertible to be end ported (1), or top ported (2), by
shifting a plug from one port to the other.
LOW SPOOL SECTIONS:
SPOOL TYPE – Open center four-way (O) connects ports A and B to tank in neutral. Tandem center
four-way (T) blocks port A and B in neutral. Tandem center four-way with metering (M) blocks port A
and B in neutral and meters flow when shifted. Tandem center three-way (T3) powers a cylinder in one
direction. Please note that closed center four-way operation can be obtained by using a tandem center fourway
spool and a closed center plug in the assembly’s outlet section.
SPOOL ACTION – Standard spring center (S) returns the handle to neutral when the handle is released.
Standard three-position detent (D) holds the spool in neutral and both active positions. Spring center detent
(SD or DS) springs back to neutral from one position and is mechanically detented in the other direction.
Fourth-position float (K) is similar to spring center except it has a fourth position that makes all ports
common to each other (last spool section only). Two-position detent (D2) P to A only. Two position
detent (2D) P to B only.
ACTUATORS – B-style handle (B) is non-adjustable and is the most common (use on low spool sections
only). G-style handle (G) is also non-adjustable (use on any spool section). Y-style handle (Y) allows the
customer to adjust the handle from straight up to straight down (use on any spool section).
OPTION – Machined for bolt on (M) cross over relief or double lock. Normally open electric switch
(WO) used with spring center option only. Normally closed electric switch (WC) used with spring center
option only. Cable attachment (Z) used with spring center option only on spring center side (Cable
actuators must have own integral centering mechanism). Jacketed cable adapter (C) allows the customer to
move the spool from a remote location. Machined to attach for handle on B port side of valve (E).
HIGH SPOOL SECTIONS – are available with the same spool type, spool action, actuator and option
choices as the low spool section, but offers added features such as individual port reliefs or double lock
valves. Three types of reliefs are offered for high sections machined with port relief cavities – ball spring
(B), area-differential (R) or area-differential with anti-cavitation check (C). Please note that all high
sections require use of adjustable (Y), non-adjustable (G). Series block cannot follow a high spool section
unless the working pressure for the previous sections is below 800 psi (55.1 bar).
Directional Control Valves
OUTLET SECTION – is available end ported (1) which is not convertible to top port, or top ported (2)
which is field convertible to end ported. Available machined for power beyond but without power beyond
cartridge (A), machined for power beyond and with the power beyond cartridge (B), closed center plug (C)
not available with power beyond, and field convertible open to closed center (D) without breaking open the
valve stack.
ACCESSORY ITEMS – both mid-inlets and mid-outlets are available, both are available as either split
flow or combined flow type.
All standard tie rod kits contain rods, foot brackets, lock washers and hex nuts. Please be sure to note
correct tie rod torque spec of 85 inch lbs. (9.6 N m).
Bolt on pilot operated double-lock, bolt-on cross-over relief or bolt on single relief valve attachments are
available (require low spool section with option (M), machined for bolt on attachment). Flow restricting
orifices which screw into the work ports of spool sections are available, either pressure compensated
(83AFF) or non-compensated (84AFF).
Seal kits, replacement relief cartridges, series blocks, relief drain blocks and many other accessory items
are available, please see the “SERIES 34 COMPLETE LIST OF OPTIONS AND ACCESSORIES” section
of this catalog, for model codes and descriptions of these items.
ASSEMBLY – model codes and list prices for complete assemblies will be issued by the factory, upon
request of an authorized Brand Distributor. All model codes so issued become proprietary to the requesting
distributor. Model codes so issued will not be descriptive in nature, but shall be of sequential numerical
type.
Individual sections and accessories can be purchased so that custom valve stacks may be assembled or
modified outside the factory.
 
[Features] [Dimensional Data] |