About Pressure-Relief Valves
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About Noise, Filtration, and Flow Ratings
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Breather Vents
Protect against excess vacuum and pressure in cylinders, gear boxes, enclosures, manifolds, and tanks. You can also use these breather vents to block debris from entering equipment.
Breather vents with splash guard are good for containers that are often filled and drained; they have a guard that prevents oil from splashing out of the vent hole.
For technical drawings and 3-D models, click on a part number.
| Style | Pipe Size  | Max. Flow Rate | Max. Pressure, psi | Max. Temp., °F | Ht. | Dia. | For Use With | Removes Particle Size Down To, microns | Features | Each | |
NPT Male | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Steel Body and Fitting | |||||||||||
| B | 1/8 | Not Rated | 125 | 400° | 3/4" | __ | Oil | __ | Splash Guard | 0000000 | 00000 |
| B | 3/8 | Not Rated | 125 | 400° | 1" | __ | Oil | __ | Splash Guard | 0000000 | 0000 |
| B | 1/2 | Not Rated | 125 | 400° | 1 1/8" | __ | Oil | __ | Splash Guard | 0000000 | 00000 |
| D | 1/8 | Not Rated | Not Rated | 225° | 1" | __ | Air, Inert Gas, Oil, Water | 40 | __ | 0000000 | 00000 |
| D | 1/4 | Not Rated | Not Rated | 225° | 1" | __ | Air, Inert Gas, Oil, Water | 40 | __ | 0000000 | 00000 |
| D | 3/8 | Not Rated | Not Rated | 225° | 1 1/16" | __ | Air, Inert Gas, Oil, Water | 40 | __ | 0000000 | 00000 |
| D | 1/2 | Not Rated | Not Rated | 225° | 1 3/16" | __ | Air, Inert Gas, Oil, Water | 40 | __ | 0000000 | 00000 |
| D | 3/4 | Not Rated | Not Rated | 225° | 1 1/4" | __ | Air, Inert Gas, Oil, Water | 40 | __ | 0000000 | 00000 |
| E | 1/8 | Not Rated | Not Rated | 225° | 1 3/16" | __ | Air, Inert Gas, Oil, Water | 40 | Splash Guard | 0000000 | 00000 |
| E | 1/4 | Not Rated | Not Rated | 225° | 1 3/16" | __ | Air, Inert Gas, Oil, Water | 40 | Splash Guard | 0000000 | 00000 |
| E | 3/8 | Not Rated | Not Rated | 225° | 1 1/4" | __ | Air, Inert Gas, Oil, Water | 40 | Splash Guard | 0000000 | 00000 |
| E | 1/2 | Not Rated | Not Rated | 225° | 1 5/16" | __ | Air, Inert Gas, Oil, Water | 40 | Splash Guard | 0000000 | 00000 |
| E | 3/4 | Not Rated | Not Rated | 225° | 1 3/8" | __ | Air, Inert Gas, Oil, Water | 40 | Splash Guard | 0000000 | 00000 |
Nylon Plastic Body and Fitting Nylon Plastic Fitting | |||||||||||
| C | 1/4 | Not Rated | Not Rated | 210° | 1 9/16" | 1 11/16" | Air, Oil | 40 | Splash Guard | 0000000 | 0000 |
| C | 3/8 | Not Rated | Not Rated | 210° | 1 3/4" | 1 11/16" | Air, Oil | 40 | Splash Guard | 0000000 | 0000 |
| C | 1/2 | Not Rated | Not Rated | 210° | 1 13/16" | 1 11/16" | Air, Oil | 40 | Splash Guard | 0000000 | 0000 |
| C | 3/4 | Not Rated | Not Rated | 210° | 1 13/16" | 1 11/16" | Air, Oil | 40 | Splash Guard | 0000000 | 0000 |
Lockable Breather Vents with Cap
Secure access to vented openings in pipe and tanks—the cap can be locked to prevent tampering. These breather vents allow you to add a filling port to your hydraulic tank while protecting against excess pressure and vacuum. Use them to stop debris from entering your tank. Breather vents mount on top of standard tank openings with included hardware. Padlock is not included.
For technical drawings and 3-D models, click on a part number.
Material | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| For Opening Dia. | Ht. | For Use With | Cap | Screen | Mount Type | Bolts Included | Removes Particle Size Down To, microns | For Max. Padlock Shackle Dia. | Each | |
| 2 1/8" | 5 1/8" | Air, Oil | Steel | 304 Stainless Steel | Flange | Yes | 10 | 3/8" | 0000000 | 000000 |
| 2 1/8" | 5 1/8" | Air, Oil | Steel | 304 Stainless Steel | Flange | Yes | 40 | 3/8" | 0000000 | 00000 |
| 2 1/8" | 6 1/8" | Air, Oil | Steel | Nylon Plastic | Flange | Yes | 10 | 3/8" | 0000000 | 00000 |
| 2 1/8" | 6 1/8" | Air, Oil | Steel | Nylon Plastic | Flange | Yes | 40 | 3/8" | 0000000 | 00000 |
Material | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Max. Temp., °F | Ht. | Dia. | For Use With | Cap | Screen | For Max. Padlock Shackle Dia. | Each | |
NPT Male | |||||||||
| 2 | 200° | 4 1/2" | 5 5/8" | Air, Oil, Water | Aluminum | Stainless Steel | 3/8" | 0000000 | 000000 |
Breather Vents with Cap
Add a filling port to your hydraulic tank while protecting against excess pressure and vacuum. Breather vents stop debris from entering your tank. Mount them on top of standard tank openings with included hardware.
For technical drawings and 3-D models, click on a part number.
Vents | Replacement Screens | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Opening Dia. | Max. Flow Rate, gpm | Max. Temp., °F | Ht. | For Use With | Screen Material | Mount Type | Number of Bolt Holes | Bolts Included | Removes Particle Size Down To, microns | Each | Each | ||
Steel Body | |||||||||||||
304 Stainless Steel Cap | |||||||||||||
| 2 1/8" | 20 | 220° | 5" | Air, Oil | 304 Stainless Steel | Flange | 6 | Yes | 40 | 0000000 | 000000 | 0000000 | 000000 |
Steel Cap | |||||||||||||
| 2 1/8" | 192 | 250° | 5 1/8" | Air, Oil | 304 Stainless Steel | Flange | 6 | Yes | 40 | 0000000 | 00000 | 0000000 | 0000 |
| For Opening Dia. | Max. Flow Rate | Max. Temp., °F | Ht. | For Use With | Screen Material | Mount Type | Number of Bolt Holes | Bolts Included | Removes Particle Size Down To, microns | Each | |
Nylon Plastic Body | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Nylon Plastic Cap | |||||||||||
| 2" | Not Rated | 195° | 5 3/4" | Air, Oil | Nylon Plastic | Flange | 6 | Yes | 40 | 0000000 | 000000 |
Vents | Replacement Screens | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Opening Dia. | Max. Flow Rate, gpm | Max. Temp., °F | Ht. | For Use With | Screen Material | Mount Type | Number of Bolt Holes | Bolts Included | Removes Particle Size Down To, microns | Each | Each | ||
Steel Body | |||||||||||||
304 Stainless Steel Cap | |||||||||||||
| 2 1/8" | 20 | 220° | 5 3/4" | Air, Oil | Nylon Plastic | Flange | 6 | Yes | 40 | 0000000 | 000000 | 0000000 | 000000 |
Steel Cap | |||||||||||||
| 2 1/8" | 115 | Not Rated | 5 1/8" | Air, Oil | 304 Stainless Steel | Flange | 6 | Yes | 10 | 00000000 | 00000 | 0000000 | 0000 |
| 2 1/8" | 115 | Not Rated | 6 1/8" | Air, Oil | Nylon Plastic | Flange | 6 | Yes | 10 | 00000000 | 00000 | 00000000 | 0000 |
| 2 1/8" | 190 | 150° | 6 1/8" | Air, Oil | Nylon Plastic | Flange | 6 | Yes | 40 | 0000000 | 00000 | 00000000 | 0000 |
Vents | Replacement Screens | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Opening Ht. | For Opening Wd. | Max. Flow Rate, gpm | Max. Temp., °F | Ht. | Wd. | Dp. | For Use With | Screen Material | Mount Type | Number of Bolt Holes | Bolts Included | Removes Particle Size Down To, microns | Each | Each | ||
Nylon Plastic Body | ||||||||||||||||
Steel Cap | ||||||||||||||||
| 3 1/2" | 3" | 115 | Not Rated | 6 1/8" | 4 5/8" | 4" | Air, Oil | 304 Stainless Steel | Flange | 7 | Yes | 10 | 00000000 | 000000 | 0000000 | 00000 |
| 3 1/2" | 3" | 192 | Not Rated | 6 1/8" | 4 5/8" | 4" | Air, Oil | 304 Stainless Steel | Flange | 7 | Yes | 40 | 00000000 | 00000 | 0000000 | 0000 |
Air-Release Valves for Oil and Fuel
- Max. Pressure: 400 psi
- Temperature Range: -20° to 500° F
Use this valve to eliminate air pockets in systems for oil, diesel fuel, gasoline, and kerosene. Valve has a vented relief port to exhaust discharge directly. Body is 304 stainless steel for excellent corrosion resistance.
For technical drawings and 3-D models, click on a part number.
Inlet | Relief Port | |||||
|---|---|---|---|---|---|---|
| Pipe Size | Location | Pipe Size | Location | Overall Ht. | Each | |
NPT Female Inlet and Relief Port | ||||||
304 Stainless Steel Body | ||||||
| 3/4 | Bottom | 1/2 | Top | 7" | 0000000 | 0000000 |
Compact Pressure-Relief Valves
Due to their small size, these valves are often installed on tanks in low-clearance areas. They begin opening at the set pressure. Nylon valves fully open at about 10% over the set pressure and steel valves fully open at about 50% over the set pressure. Valves begin closing as pressure drops and fully close when the system pressure is restored below the set pressure. All have a vent outlet to exhaust discharge directly. Set pressure is not adjustable.
For technical drawings and 3-D models, click on a part number.
- For Use With: Grease, Oil
- Temperature Range: Not Rated
Inlet | Each | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Location | Maximum Pressure, psi | Relief Port Location | Overall Ht. | Specifications Met | Set Pressure, psi | 1-9 | 10-Up | |
NPTF Male Inlet and Relief Vent | |||||||||
| 1/8 | Bottom | 5 | Top | 1/2" | MS35670 | 1 | 000000 | 00000 | 00000 |
| 1/8 | Bottom | 15 | Top | 1/2" | MS35670 | 7.5 | 000000 | 0000 | 0000 |
| 1/8 | Bottom | 25 | Top | 1/2" | MS35670 | 15 | 000000 | 0000 | 0000 |
| 1/8 | Bottom | 80 | Top | 1/2" | MS35670 | 45 | 000000 | 0000 | 0000 |
| 1/8 | Bottom | 140 | Top | 9/16" | MS35670 | 80 | 0000000 | 0000 | 0000 |
| 1/8 | Bottom | 200 | Top | 1/2" | MS35670 | 100 | 0000000 | 0000 | 0000 |
| 1/8 | Bottom | 650 | Top | 1/2" | MS35670 | 400 | 0000000 | 0000 | 0000 |
BSPT Male Inlet and Relief Vent | |||||||||
| 1/8 | Bottom | 1 | Top | 1/2" | __ | 0.3 | 0000000 | 0000 | 0000 |
| 1/8 | Bottom | 5 | Top | 1/2" | __ | 1 | 0000000 | 0000 | 0000 |
| 1/8 | Bottom | 80 | Top | 1/2" | __ | 45 | 0000000 | 0000 | 0000 |
Pressure-Relief Valves for Oil
- For Use With: Oil
- Temperature Range: -320° to 420° F
These valves are often used in hydraulic and lubrication systems. They begin opening at the set pressure and fully open at about 10% over the set pressure. Valves begin closing as pressure drops and fully close when the system pressure is restored below the set pressure. Adjust the set pressure within the range.
For technical drawings and 3-D models, click on a part number.
Inlet | Relief Port | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Location | Maximum Pressure, psi | Pipe Size | Location | Set Pressure Adjustment Method | Overall Ht. | Choose a Set Pressure Range, psi | Each | |
NPT Male Inlet and NPT Female Relief Port | |||||||||
Bronze Body—316 Stainless Steel Seal | |||||||||
| 1/2 | Bottom | 1,400 | 3/4 | Side | External Adjustment Screw | 7 1/4" | 0000000 | 0000000 | |
| 3/4 | Bottom | 1,400 | 3/4 | Side | External Adjustment Screw | 7 1/4" | 0000000 | 000000 | |
| 1 | Bottom | 1,400 | 1 | Side | External Adjustment Screw | 7 1/2" | 0000000 | 000000 | |
| 1 1/4 | Bottom | 1,400 | 1 1/4 | Side | External Adjustment Screw | 8" | 0000000 | 000000 | |
| 1 1/2 | Bottom | 1,400 | 1 1/2 | Side | External Adjustment Screw | 8 7/8" | 0000000 | 00000000 | |