Figure 4-16. Adjustment of pressure regulating valve

TM 5-4120-356-14

TS5412035614/4-16

ADJUSTMENT OF PRESSURE REGULATOR VALVE

REFER TO PARAGRAPH 4-14f FOR PRELIMINARY STEPS IN ADJUSTMENT OF PRESSURE REGULATOR VALVE.

2. REFER TO VIEW A, AND REMOVE PRESSURE REGULATOR VALVE FROM UNIT.

3. REFER TO VIEW B, AND CONNECT A SOURCE OF VAPORIZED NITROGEN TO THE VALVE AT POINT A.

4. APPLY 100 PSIG (7 ks/cm2) TO THE VALVE AT POINT A. THERE SHOULD BE NO DISCHARGE OF NITROGEN

FROM THE VALVE AT POINT B.

5. SLOWLY DECREASE THE NITROGEN PRESSURE APPLIED TO THE VALVE UNTIL THE VALVE OPENS AND NI-

TROGEN BEGINS TO BE DISCHARGE FROM THE VALVE AT POINT B THE VALVE SHOULD OPEN WHEN THE

NITROGEN PRESSURE HAS BEEN DECREASED TO 58 PSIG (4 ks/cm

IF VALVE OPENS AT A PRESSURE ABOVE OR BELOW 58 PSIG (4 ks/cm2), ADJUST THE VALVE BY TURN-

ING THE STEM AT POINT C. CLOCKWISE ROTATION OF THE STEM WILL INCREASE THE PRESSURE AT WHICH

THE VALVE WILL OPEN. COUNTER-CLOCKWISE ROTATION OF THE STEM WILL DECREASE THE PRESSURE AT

WHICH THE VALVE WILL OPEN. THE VALVE SHOULD BE ADJUSTED UNTIL IT OPENS AT A PRESSURE OF 58

PSIG (4 ks/cm2).

REFER TO PARAGRAPH 4-14f FOR FINAL STEPS IN ADJUSTMENT OF THE PRESSURE REGULATOR VALVE.

Figure 4-16. Adjustment of pressure regulating valve