Paravalve User's Guide

Straw cut guide

There is no need to cut your straw if using the Paravalve 2.0 straw with the 48 oz Nalgene Silo bottle. Most other bottles will need to have the straw cut to match the bottle depth. If you cut off too much, you won't be able to get all the liquid out using the straw. If you don't cut off enough, the bottom of the straw will press against the bottom of the bottle and it will interfere with the free flow of liquid up the straw. Use this guide and any sharp knife to get the correct length for your bottle:

Straw Cut Guide

When done, the bottom opening of the straw should float just above the bottom of your bottle as shown below:

Correct straw length

Not all bottles are the same: The shape of the bottom of your bottle may require an adjustment to your straw length. If you meet a lot of resistance when trying to suck on the spout, your straw may be too long and pressing against the bottom of the bottle, preventing free flow. You can test this by unscrewing the lid and sucking on the spout with the lid loosely on the bottle - this should pull the straw opening away from the bottom of the bottle, allowing it to sip freely. To address this case, trim the straw by 1/8" and retest.]

Operation

There are three positions for the spout as shown below. In the closed position, it is completely leak-proof. The open position allows for the free flow of liquid up the straw, as well as the free flow of air into the bottle, preventing vacuum resistance; it is not leak-proof in this position. The vent position is for venting any pressure that may have built up inside the bottle; this can happen if you are using a carbonated beverage, the bottle sits in the sun or near a heat source, or air pressure changes outside the bottle. By venting the pressure, it prevents blowback up the straw. The vent position spans about 30 degrees of rotation and is in the middle between the closed and open positions.

Three position spout

The Paravalve works with liquids up to 140 deg. F (60 deg. C). The hot liquid may expand the air and pressurize the bottle. If you are using the Paravalve with hot liquids, it is important to pause in the vent position for a second or two to prevent hot liquid from coming back up the straw to release the built up pressure.

We don't recommend using the Paravalve straw with liquids hotter than 140 degrees (60 deg. C); the high flow rate could burn your mouth. There may also be a correlation between drinking very hot beverages and esophageal cancer: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2773211/

Seal Lubrication

Silicone is one of the least toxic materials around, and that's why we use it for our seals. Unfortunately, it's safety comes with some disadvantages. It has poor wear resistance and high friction. This works great for the O-ring, which is not subject to dynamic forces. However the seals under the spout are subject to dynamic forces every time the spout is opened or closed. Lubrication can alleviate the downsides to silicone. 

The seals come pre-lubricated from the factory. We recommend that the two seals under the spout be lubricated with a food grade oil a couple of times per year or when friction develops in order to make moving the spout easier and avoiding seal replacement. We have spare seals available if you should need them, but you can also follow this procedure for maximum seal life and optimum lid performance.

The best oil to use is food safe silicone oil. This is available from Home Depot for about $7; one bottle would last you thousands of applications. You may also use a cooking oil, though we do not recommend polyunsaturated vegetable oils like soy, corn, sunflower, safflower and Canola as they oxidize easily and can gum up the movement. Olive oil, coconut oil or palm oil work well.

The following procedure only applies to the Paravalve 2.0 straw lids. The original Paravalve lid does not have a removable spout.

Remove the spout

Cleaning

The Paravalve lid may be cleaned in the top rack of the dishwasher. Be sure not to loose the O-ring seal that goes inside the lid, as this can come loose with the agitation of the dishwasher. You can clean the straw in warm soapy water using the included straw cleaning brush.

The seals under the spout may be cleaned as well. This is more important if you use your lid for any drink that has sugar, even natural sugars, as these tend to promote mold. Please refer to the spout removal sequence above to remove the spout and access the seals. They can be removed using a toothpick or other small tool. They're easy to loose, so take care when removing and cleaning. If mold develops, try soaking them overnight in hydrogen peroxide.

Seal Replacement

In addition to the problems of silicone in dynamic application (see seal lubrication above), silicone is somewhat porous, which makes it vulnerable to invasion by mold if not cleaned frequently, particularly with drinks which contain sugar, which is food for mold. Thankfully, all three silicone seals are easily replaced:

  • O-ring:  This seals the lid to the bottle. To remove it, bang the bottom of the lid against your hand or other firm surface. It should come out after a few times. When replacing the O-ring, use a popsicle stick or similar object to push the new O-ring into position. Don't use a knife or other sharp object which could cut the silicone.
  • Water Seal and Air Seal: These two seals are underneath the spout, so the spout must be removed before they can be replaced. The spout removal procedure is shown above under "Seal Lubrication". You can use a toothpick or dental pick to remove the old seals. Clean the seal cavities with warm soapy water before placing the new seals, then re-install the spout.

Troubleshooting

If you are getting air mixed with water , make sure the straw is fully inserted and the spout is in the fully open position and try again. If the problem persists, then you may be missing the seal under the spout; please contact customer service for assistance.

If there is difficulty sucking water up the straw, The most likely cause is that your straw is too long and pressing against the bottle of the bottle. To check this, loosen the lid so it rests loosely on top the bottle and see if you can now drink easily. If so, your straw is too long - trim it and try again. This problem can also occur if there is a tea bag or other firm objects at the bottle of the bottle. If the problem persists, contact customer service.

If you are getting water shooting out the spout when you open it, then the bottle contents are pressurized due to heat or carbonation. Try slowly opening the spout half way to the vent position, which is mid way between the open and closed position. It will only take 1 or 2 seconds to release any built up pressure. Once the pressure has released, you can open the spout without getting soaked and drink normally.

If you have any other problems, please contact us at support@eafproducts.com.

Hidden Feature: gentle pour stream

One thing we found, quite by accident, is that the dual ball valve system can provide a gentle stream of water that is useful for washing hands, giving your dog a drink, or provide a "no touch" way to share some water with a friend. To do this, open up the spout, and with the air hole below the water hole, tilt the bottle to the side; the water path will act as the vent, and you will get a small stream of water out the vent hole.

Hidden Feature: Gentle pour stream

One handed operation

With a little practice, you too can become a one hand bottle ninja! We love being able to drink when riding without taking our eyes off the road.

Contact us anytime

support@eafproducts.com

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