Borlab A.Ş.

Plastik Boru Ve Vana Kalitesine Bağımsız Laboratuvar Olarak BORLAB Yön Veriyor... Independent Laboratory That BORLAB Gives Direction Quality of Plastic Pipes... www.borlab.com.tr 26 TIGHTNESS TESTS OF VALVES Testing of Metallic Valves-Pressure Tests-Mandatory Requirements (TS EN 12266-1) Body Strength (P10) It is done to verify the pressure build-up of the body against internal pressure. Body Tightness (P11) The operation against internal pressure is made to verify the tightness of the body containing the gasket. Seat Tightness (P12) It is done to verify seat/seats capability in which the valves are desingned direction/directions to be compatible with the specified leakage flow rate. Testing of Metallic Valves-Supplementary Requirements (TS EN 12266-2) Obturator Strength (P20) It is done to verify the ability of the closing element to be exposed to the permissible pressure difference. Back Seat Tightness (P21) It is done to verify the capacity of the back seat for specific leakage flow. Fitness for Purpose Requirements and Appropriate Verification Tests-General Requirements (TS EN 1074-1) It covers sealing tests for valves regardless of type and material. Sealing test of the body and all the parts under pressure and the seals sealing test of the valves in the fully closed position. It must be compatible with the specified leakage flow and no visible leakage in the valves. Safety Valves for Protection Against Excessive Pressure (TS EN ISO 4126-1) Safety valves are designed to automatically discharge a certain amount of fluid and, in operation conditions, to reclose after normal pressure conditions have been restored and to prevent further fluid passage, without any energy assistance outside the fluid concerned, to avoid exceeding the prescribed safety pressure. Each safety valve must be set the indicated setting or cold difference test pressure. The seat tightness test of the safety valve must be carried out after the setting or cold difference test pressure has been adjusted. It must be compatible with the specified leakage flow rate.