{"product_id":"duotight-blowtie-2-diaphragm-spunding-valve","title":"Duotight BlowTie 2 Diaphragm Spunding Valve","description":"Automatically release pressure inside your fermenter during pressure fermentations\n\nRegulate beer flow during pressurized transfers from fermenter to keg\n\nBuilt-in pressure gauge for easy reference when adjusting the spunding valve\n\nPressure gauge is interchangeable—swap to different \u003ca href=\"https:\/\/northtexashomebrew.com\/?s=mini+pressure+gauge\u0026amp;post_type=product\u0026amp;type_aws=true\"\u003epressure ranges\u003c\/a\u003e that better suit your application\n\nDiaphragm spunding valves offer higher accuracy compared to spring \u0026amp; poppet spunding valves\n\n8 mm Duotight inlet\/outlet for use with 8 mm OD \u003ca href=\"https:\/\/northtexashomebrew.com\/?s=evabarrier\u0026amp;post_type=product\u0026amp;type_aws=true\"\u003eEVABarrier\u003c\/a\u003e tubing or 8 mm \u003ca href=\"https:\/\/northtexashomebrew.com\/product\/duotight-rigid-plastic-joiner-8mm\/\"\u003eRigid Joiners\u003c\/a\u003e\n\nThe Blow Tie Spunding Valve is used to release excess pressure on a pressurized fermenter or from a receiving keg during pressure transfers. This diaphragm spunding valve is much more accurate than the spring and poppet style, and works much better at lower pressures.\n\nThe BlowTie 2 features an integrated pressure gauge so you can quickly and easily dial in your pressure setting. The analog gauge is removable and can be swapped out with a gauge of a different pressure range or it can be swapped out for the \u003ca href=\"https:\/\/northtexashomebrew.com\/product\/digital-mini-pressure-gauge-0-90-psi\/\"\u003eDigital Mini Pressure Gauge\u003c\/a\u003e.\n\nPressure Fermentation\n\nPressure fermentation is becoming more and more popular at the homebrew level, but in order to do it safely and accurately you need a way to release excess pressure. You'll pressurize your vessel to your desired psi, but once fermentation begins and those hungry, active yeast start creating CO2, the pressure inside the vessel will increase. Attach a spunding valve and set it to your desired pressure, and it will blow off when the pressure gets too high and close up again when it's back to your desired psi.\n\nPressure Transfers\n\nEven if you don't have a pressurizable fermenter, you may have done pressure transfers from keg to keg during filtering or after fining. During pressure transfers, it's a good idea to have a bit of head pressure in the receiving keg, especially if you're transferring beer that is already carbonated. Having a spunding valve in place will allow you to consistently control the head pressure and give you more consistent results, without losing carbonation in the process.\n\nDiaphragm vs. Poppet\n\nWith the poppet style spunding valve, a spring pushes against a poppet to keep the valve closed. When the poppet lifts up to open, the surface area the gas pushes against becomes larger, and the spring has to work harder to push the poppet down and reseal the valve. This can lead to more gas being released than intended, and the remaining pressure in your vessel may be at a lower psi than your spunding valve’s set psi.\n\nInstead of a poppet, the spring inside the BlowTie pushes against a diaphragm, which has an immensely larger surface area. This means the surface area that the gas pushes against while the diaphragm is closed is significantly closer to the surface area it pushes against when the diaphragm is open. This leads to higher accuracy, and the remaining pressure after excess gas is released will be much closer to your set blow off pressure.\n\nSet Up\n\nThe BlowTie spunding valve comes with 8 mm Duotight fittings on the inlet and outlet, and we recommend using it with EVABarrier 8 mm OD tubing (\u003ca href=\"https:\/\/northtexashomebrew.com\/product\/evabarrier-double-wall-draft-tubing-4mm-5-32-id-x-8mm-5-16-od\/\"\u003eD1717\u003c\/a\u003e or D1718). You'll also need the flare Duotight fitting (\u003ca href=\"https:\/\/northtexashomebrew.com\/product\/duotight-push-in-fitting-adapter-8mm-5-16-x-1-4-flare\/\"\u003eDUO106\u003c\/a\u003e) in order to attach it to a ball lock or pin lock disconnect. Dialing in your desired pressure is even easier with the BlowTie 2, thanks to the integrated pressure gauge. Simply start with the adjustment knob fully closed, then slowly open it until the gauge reading matches your desired pressure setting.\n\nSpecifications:\n\nMade from food grade acetal\n\nStainless screws\n\nEasily disassembles for cleaning\n\n8mm (5\/16\") Duotight fittings at both ends\n\nInterchangeable pressure gauge\n\nGauge reads from 0-15 psi\n\nWARNING: Do not exceed gauge pressure. Exceeding the pressure range will damage the gauge.","brand":"Kegland","offers":[{"title":"Default Title","offer_id":47280938909884,"sku":"fe962","price":21.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0790\/7370\/6172\/files\/38166.jpg?v=1786817100","url":"https:\/\/nthbs.com\/products\/duotight-blowtie-2-diaphragm-spunding-valve","provider":"North Texas Homebrew Supply","version":"1.0","type":"link"}