ISO 07: On P

Function

Top Cell
Function for DKO: Check, On P, High Capacity
Check, On P, High Capacity
Function for DKO: Flow Control, Meter-In P, High Capacity
Flow Control, Meter-In P, High Capacity
Bottom Cell
Technical Data [ + ]
Body Type SandwichSandwich
Interface ISO 07ISO 07
Body Features On POn P
Stack Height 3.52 in.90 mm
Open Cavities 11
Cavity T-18A
FAQs [ + ]

Yes. If you look in the sandwich section you will see that we offer many such packages. When you are pressurizing B, A is connected to tank, allowing the reducer to do its job. When you reverse, the drain or tank port of the reducer is pressurized by A. This increases the setting of the reducer and helps keep the reducer open in the reverse flow direction.

In the beginning, the bosses (profiles) were cylindrical and centered on the cavity. The boss created a consistant locating spot for the fixture that put in the bolt through holes. The first step in machining sandwiches was to put in the cavities and this was done using big old #4 Warner-Swazey turret lathes. Adding the circular boss was practically free at this point. When 2 or more sandwiches are stacked they look designed rather than a random stack of blocks. This was deemed esthetically pleasing and became a Sun trademark. You can spot Sun sandwiches from across a factory floor. We switched to CNC in the early 80's but kept the circular boss. At this time the first sandwich with 2 cavities on one side was designed, the YFCG XHN AA. Obviously we could not use a circular boss centered on a cavity; we tried a partial circular boss centered on both of the cavities, but the resulting appearance was poor. The solution was a rectangular boss with radiused corners. The resulting profile was pleasing and more modern looking than the circular boss and served a functional purpose--less material had to be removed. We changed all the other sandwich bosses to match. We have applied the boss profile to some custom manifolds.....just because it looks good.

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

  • Make sure the surfaces are flat and that there are no burrs. Do not polish the surface; machining marks are good. The machining marks help stop the o-rings from acting as pumps.
  • Look for dings on the corners of seal plates that will create gaps.
  • Stud rods or cap screws must not bottom out in the sub-plate.
  • It is very important to assemble a stack of sandwich valves keeping the o-ring sealing surfaces “dry.” The hydrostatic properties of an oil film under the o-rings, and at the seal plate interface, can create a fluid path leading from the pressurized port interfaces to the outside edge of the stack. (Under this condition, as noted in bullet point above, an o-ring can actually act as a “pump.”) So, if you start with a wet seal interface in your stack, there’s a good chance it will always stay wet.
Notes [ + ]
  • Important: Carefully consider the maximum system pressure. The pressure rating of the manifold is dependent on the manifold material, with the port type/size a secondary consideration. Manifolds constructed of aluminum are not rated for pressures higher than 3000 psi (210 bar), regardless of the port type/size specified.
Additional Resources [ + ]