We can customize our vent caps for special applications. Below are examples of a few of the customizations we have done.
SCREEN MESH
The screen meshes we use are 24 mesh or finer to exclude insects such as mosquitoes. The mesh is plastic so it it non-corroding, however there are different choice of material available. Conventionally we use polypropylene for its physical rigidity but Nylon and Polyester are also viable alternatives. Here is a chemical resistance chart comparing the three materials side-by-side.
PIPE SCREEN (IN-LINE)
This customer wanted a screen in their pipe line without our usual mushroom cap. The mesh is the same as our standard caps which is polypropylene 24 x 24 mesh. (or 800 microns) This example is on a 4 inch male thread but we have made the same pipe screen in many sizes.
STAINLESS SCREEN.
This customer wanted wanted to comply with specification drawings that called out stainless screen. Although we see no advantage of stainless screens in preference to polypropylene, substituting a stainless screen saved a lot of engineering time to re-evaluate and re-issue the specification drawings.
We used 24 x 24 mesh 316 stainless steel so it is still meets our corrosion-proof standard.
[32390]
VENT CAP WITH SIDE OUTLET
This is a custom product made to our customer’s specifications. They wanted a side outlet for liquid transfer.
VENT CAP WITH FINE SCREEN. Due to a local ordinance this customer wanted an 8 inch vent cap with 31 mesh screen (approximately 600 microns) instead of the perforated PVC sheet.
14979
COLORED VENT CAP.
This customer wanted black colored caps. We experimented with various approaches, including a ceramic coating by the trade name Ceracoat, caps molded with black PVC, a cap constructed from black ABS, and a dye process. The requirement was that the final product had to pass the challenging “stone chipping” tests.
The ABS pipe parts which are manufactured in black plastic, would be intrinsically resistant to the “stone chipping” test, but these are much more costly, and prone to chalking in sunlight. They also didn’t have the desirable glossy appearance that the treated caps were able to achieve.
We ran samples of black PVC caps which are also intinriscally resistant to chipping, but the surface was matte, and our customer’s volume didn’t justify a run of custom color injection molding.
The Dye treatment penetrated the material do a considerable depth so stone chips were not visible. The glossy surface was a happy accident that turned out to give a much better appearance. So after considering all the options, our customer preferred our dye treatment.
3544
SPECIAL PIPE SIZE
This customer had an odd-size pipe stub existing, and wanted to use it to mount a vent cap. To accomplish this we machined a correctly-sized plastic piece inside the (gray) pipe part of the vent cap so the vent cap fit the customer’s pipe exactly.
VENT CAP WITH FLANGE
Vent caps 2 inches and smaller can be screwed into a threaded flange. We tap the flange so the vent cap threads all the way in. There is no reason to use an one-piece construction. (see image to the LEFT)
Vent caps 3 inches and larger sometimes may prefer a one-piece integral construction. (RIGHT)
LOW PROFILE VENT CAP WITH FLANGE MOUNT.
Screen is perforated PVC with 1/8″ holes – 40% open area. This unit is a low profile with oeverall height only 6 inches. The vent cap is mounted on a 10 inch flange.
TALL VENT CAP
Made to our customer’s specifications. The intent was to allow sloshing in vehicles without spillage out of the vent cap.