Model Descriptions Model 189: Bronze housing with Stainless Steel (SS) trim (nozzle and disc) with Teflon® seat/seal in disc. Plain lift lever. Model 189C: Same as model 189 except pressure tight cap for gas service only. Suitable for maximum back pressure of 50 psig.* Model 189P: Same as model 189 except pressure tight packed lift lever. Suitable for maximum back pressure of 50 psig.* Model 363: Bronze housing with SS trim (nozzle and disc) with Teflon® seat/seal in disc. Plain lift lever. 1000 psig maximum set pressure. Model 363C: Same as model 363 except pressure tight cap for gas service only. Suitable for maximum back pressure of 50 psig.1 1000 psig maximum set pressure. Model 363P: Same as model 363 except pressure tight packed lift lever. Suitable for maximum back pressure of 50 psig.1 1000 psig maximum set pressure. Model 389C: All SS with Teflon® seat/seal in disc. Pressure tight cap for gas service only. Suitable for maximum back pressure of 50 psig.* Model 389P: Same as model 389C except pressure tight packed lift lever. Suitable for maximum back pressure of 50 psig.
* Back pressure increases set pressure on a one to one basis, and reduces capacity. Back pressure in excess of 10% of set pressure is not recommended.
Features & Benefits:
Unique three-piece disc assembly (with Teflon® seat/seal) offers superior leak-free performance over the entire pressure/temperature operating range.
Warn ring offers precise opening with minimum pre-open or simmer.
Pivot between disc and spring corrects for all misalignment and compensates for spring side thrust.
All adjustments are factory sealed to prevent tampering and disassembly.
Each Kunkle valve is tested and inspected for pressure setting and leakage.
Specifications
Pressure and Temperature Limits Model 363: 50 psig to 1000 psig; -320°F to 350°F Model 189: 1000 psig to 2500 psig; -320°F to 350°F Model 389: 50 psig to 2500 psig; -320°F to 350°F
