The 0.281 inch diameter Pressure Relief Valve is now available made from corrosion-resistant materials that are compliant with NACE specification MR0175 / ISO 15156 to suit harsh duty applications such as those found in the oil tool industry. Standard valves are available in forward and reverse flow directions with cracking pressures from 80 to 5,900 psid. Custom models are also available with cracking pressures as high as 12,000 psid.