Solenoid operated pilot relief assembly
|4, 4/S||Ports 1 & 2: 1" Code 62; Port G: 1/4" NPTF;|
|4/M, 4/T||Ports 1 & 2: 1" Code 62; Port G: 1/4" BSPP;|
|5, 5/S||Ports 1 & 2: 1 1/4" Code 62; Port G: 1/4" NPTF;|
|5/M, 5/T||Ports 1 & 2: 1 1/4" Code 62; Port G: 1/4" BSPP;|
|D, D/S||Ports 1 & 2: 3/4" NPTF; Port G: 1/4" NPTF;|
|E, E/S||Ports 1 & 2: 1" NPTF; Port G: 1/4" NPTF;|
|F, F/S||Ports 1 & 2: 1 1/4" NPTF; Port G: 1/4" NPTF;|
|L, L/S||Ports 1 & 2: SAE 12; Port G: 1/4" NPTF;|
|M, M/S||Ports 1 & 2: SAE 16; Port G: 1/4" NPTF;|
|N, N/S||Ports 1 & 2: SAE 20; Port G: 1/4" NPTF;|
|P, P/S||Ports 1 & 2: 1" Code 61; Port G: 1/4" NPTF;|
|P/M, P/T||Ports 1 & 2: 1" Code 61; Port G: 1/4" BSPP;|
|Q, Q/S||Ports 1 & 2: 1 1/4" Code 61; Port G: 1/4" NPTF;|
|Q/M, Q/T||Ports 1 & 2: 1 1/4" Code 61; Port G: 1/4" BSPP;|
|W, W/S||Ports 1 & 2: 3/4" BSPP; Port G: 1/4" BSPP;|
|X, X/S||Ports 1 & 2: 1" BSPP; Port G: 1/4" BSPP;|
|Y, Y/S||Ports 1 & 2: 1 1/4" BSPP; Port G: 1/4" BSPP;|
This valve assembly provides 2 functions. It relieves from pressure (port 1) to tank (port 2) when pressure at port 1 exceeds the setting of the valve. The solenoid control allows the valve to be vented, dropping the pressure to a minimal level. This assembly is available in both normally open H option, normally closed C option, as well as an empty pilot control cavity. The normally open option means the pressure is at a low level until the solenoid is energized. The normally closed option means the pressure is at a high level until the solenoid is energized.
- Not suitable for use in load holding applications due to spool leakage.
- Back pressure on the tank port (port 2) is directly additive to the valve setting at a 1:1 ratio.
- This assembly is well suited to loading and unloading a pump.
- The nature of a vented relief is that it brings the pressure up in a smooth manner. Unloading is abrupt.
|Capacity||60 gpm240 L/min.|
|Body Type||Line mountLine mount|
|Mounting Hole Thread||.375-16 UNC - 2B in..375-16 UNC - 2B in.|
|Mounting Hole Quantity||22|
There are exactly 250 Sun drops in a cubic inch or 15 in a cc.
Reasons to anodize:
- To increase corrosion resistance. Sun uses 6061-T651 aluminum. It is one of the most corrosion resistant aluminum alloys there is. Whether or not anodizing improves the corrosion resistance of 6061 aluminum is debatable. We have yet to have a manifold returned because of corrosion.
- Appearance (color). The 2 colors that would appeal to Sun would be blue or black. Unfortunately these are the colors that are hardest to do consistently.
- To provide a hard wear surface. Sun does not make parts-in-body valves. The manifold is just plumbing. We don't need a wear surface.
- Because everyone else does it. Bad reason.
Reasons to not anodize:
- Cost. It's another process.
- Logistics. When you make tens of thousands of manifolds a month and you anodize hundreds, it's a problem. Consistency. See above.
- Stamping. After a body is anodized you cannot do any more stamping without making a mess.
Inspection. Have you ever tried to look for burrs in a black anodized body? It's the old blackboard factory at night scenario.
- Torque. You will experience an increase in breakaway torque when removing items from an anodized manifold.
- Fatigue life. This is the best reason to not anodize. Fatigue failure is a very complex phenomenon. What it takes to initiate a crack is difficult to predict. What it takes to propagate a crack is readily defined. Anodizing produces a very thin, very hard, and very brittle surface on aluminum. The first time you pressurize an anodized aluminum manifold you have initiated fatigue cracks. Whether or not the stress is enough to propagate the cracks is a matter of pressure and manifold geometry. Anodizing an aluminum manifold grossly reduces the fatigue life by anywhere from 20% to 50%.
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.
- 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.
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