Injection Pressure Operated
Gas Lift Valve

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DESCRIPTION
N Series Valves utilize a nitrogen charged dome and bellow configuration designed for either continuous or intermittent flow applications. They are especially suitable for use as unloading and operating valves in areas where high gas lift pressures are available. Since the charge pressure above the bellows is affected by temperature, it is important that the operating temperatures at the valve be known. These valve are available in both wirelineretrievable and conventional installations.

BENEFITS
Vibration protected, 3-ply monel bellow are designed to withstand hydrostatic pressure up to 5000 psi.
Nitrogen dome charge, acting on the O.D. of the bellow, permits bellows to expand uniformly without stacking, thus prolonging bellow's life.
The multiple port size availability, make this valve series appropriate for a wide range of operating conditions. Reversible seat available in several different materials.

OPERATING PRINCIPLE
The dome nitrogen charge applied to the external area of the bellows provides the downward force, holding the valve on its seat. This dome pressure is preset at the reference temperature and corrected to operating temperature. The opening forces on the valve are the casing pressure acting on the internal area of the bellows (less the area of the seat) and the tubing pressure acting on the seat area. When the combined casing and tubing pressures are sufficient, the valve opens. Once the valve is open, it remains open until the casing pressure is reduced to the predetermined closing pressure. The spread (the difference between opening and closing casing pressure) is controlled by the tubing sensitivity of the valve. The larger the seat port area, the more tubing sensitive the valve is.

ENGINEERING DATA FOR INJECTION PRESSURE OPERATED VALVES
TYPE ASSY. NO. NOMINAL
OD
(INCH)
PACKING OD
(INCH)
PORT SIZE
(INCH)
LATCH OR
END CONN.
RUNNING
TOOL
TYPE
PULLING
TOOL
TYPE
MANDREL
TYPE
UPPER LOWER MIN MAX
N-90 122-10XX-XXX-XO 1-1/2 - - 1/8 1/2 1" or 1/2" NPT - - SERIES 15
N-90R 122-10XX-XXX-X1 1-1/2 1-9/16 1-1/2 1/8 1/2 TG, RK, RM, T-2 RTG, TER PTG, TRP TP, MM,
MMA, MMG
NM-90 122-20XX-XXX-XO 1 - - 1/8 3/8 1/2" NPT - - SERIES 12
NM-90R 122-20XX-XXX-X1 1 1-1/32 1-1/32 1/8 3/8 BK-2, M MR MP TMP, KBM,
KBMG, KBG
PBK-1 122-90XX-XXX-X1 1 1-1/32 1-1/32 1/8 3/8 Integral Bottom GA-2 MP TMP, KBM,
KBMG, KBG

Injection Pressure Operated Gas Lift Valve