Series RVDT, RVDTM ½” and 1” (PV,CP, PP, PF only)
, Thermoplastic [PVC, CPVC, Polypropylene, PVDF (Kynar) or PTFE] [ 1/4", 1/2", 3/4", 1", 1 1/2" or 2"], 316SS (1/2”, ¾” and 1” only) pressure relief valve NPT threads. Relief setting is infinitely adjustable from 5 psi to 125 psi. 5-100 psi on 3" and 4" sizes is to be in-line ported with flat PTFE diaphragm, backed by Viton, as the primary seal. Adjusting bolt and lock nut are to be all plastic. Valve is to have Fail-Dry® advance warning feature incorporating a vented chamber between the flat diaphragm and a secondary elastomer diaphragm to protect the spring chamber. [Optional:] Manufacturer shall factory set the pressure relief valve at [between 5 and 125 for ¼”-2” and 5-100 for 3” and 4”] PSI. ADD: "With tamper-proof option" after pressure setting, if required.