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Whenever gases or liquids are introduced into a vessel under pressure, the supply pressure must be greater than the pressure in the vessel to prevent reverse flow back into the supply system. Protection against reverse flow can be obtained by installing a check valve in the supply line. With a check valve in the line, the valve will snap shut if the supply pressure is lower than the pressure in the vessel. This protection is particularly important on stirred reactors where gas enters through a dip tube. With liquids in the vessel, any back pressure will force liquid back into the gas tank or into the gas supply system.
Parr stocks a variety of poppet check valves for incorporation into the user’s supply lines. These valves are typically constructed of T316SS with FKM O-rings with a 10 psi cracking pressure. Alternate O-ring materials and cracking pressures are available upon request.

We will deliver within 3 hours if the scope of delivery ≤ 30km from the store, separate purchase orders will be delivered online within 2 hours for orders with a value of 200,000 VND or more and apply for all sectors. We will delivery within 05-07 days for delivery range from 100km to 200km from store For orders with delivery range from 30km - 100km, the salesperson will directly agreed delivery time to customers. Before shipping, logistics department will contact customers to schedule time, specific location for delivery to customers. Time Delivery and installation: from 8:30 to 21h30 every day of the week.
Request pay change is considered valid if fully agreed the following conditions: - Products must change payment including registration forms and change delivery of VAT invoice store - Products are shipped with the complete accessories (including manuals, warranty cards, product packaging, ...) and gifts together (if any). - Products still in the validity period for the return / exchange (7 days or 14 days of receipt of goods - depending on the policy applies). Effective duration is calculated starting from the date of receipt of goods until the customer sends the item as noted on the postal consignment. - No support for change pay no satisfactory reason for the policy line installment payment.