Technical specifications - Johnson Controls - LIT-1924020 - Accessory - VB-3766 Series Brass Flare Valve - VB-3966 Series Brass Flare Valve - VB-4332 Series Brass Flare Valve

Service

Hot and cold water

Valve stem diameter

1/4 in.

Maximum seat leakage

PDTC and PDTO: 0.01% of maximum rated valve capacity (Cv);

Three-way mixing: 0.25% of maximum rated valve capacity (Cv)

Maximum recommended operating differential pressure for valve sizing

35 psi (245 kPa)

Valve stroke length (travel)

Two-way (VB-3766, VB-3966): 1/2 in.

Three-way (VB-4332): 5/16 in.

Maximum allowable pressure/temperature

(Two-way) VB-3766, VB-3966: 400 psi (2,800 kPa) up to 150 ° F (66 ° C) decreasing to 345 psi (2,415 kPa) at 281 ° F (140 ° C);

(Three-way mixing) and VB-4332: 240 psi (1,750 kPa) maximum to 281 ° F (140 ° C)

Fluid operating temperature limits

For VA-805x Electric Actuators:35°F-195 ° F (2°C-90 ° C);

For all pneumatic actuators:35°F-281 ° F (2°C-38 ° C)

Maximum closeoff pressures

Refer to the V-3766, V-3966, and V-4332 Brass Pneumatic Flare Valves 1/2 in. Two-Way and Three-Way Catalog Page (LIT-1924115).

Flow characteristics

VB-3766

PDTC: equal percentage

VB-3966

PDTO: Cv 1.7: equal percentage;Cv 3.2: modified equal percentage

VB-4332

Both ports: Cv 1.0/1.5 linear;

PDTC/PDTO: Cv 1.7/2.3 quick opening/linear

Materials

Stem

Stainless steel

Plug

PDTC (N.O.) and PDTO (N.C.): brass with molded and bonded composition disk;

Three-way mixing: brass (metal-to-metal)

Body

Cast bronze with natural finish

Packing

Non-adjustable EPR (Ethylene Propylene Rubber) Ring Packs

Body style and end connection

Offset globe for 1/2 in. S.A.E. flared connections

Rangeability and flow coefficient

Max. Cv (kv) — rangeability

VB-3766PDTC

1.0 (.85) — 7:1

1.7 (1.5) — 12:1

3.2 (2.7) — 23:1

VB-3966PDTO

1.8 (1.5) — 12:1

2.7 (2.3) — 23:1

VB-4332Mix

1.0 (.85) PDTC port / 1.5 (1.28) PDTO port— 10:1 for PDTC port, 4:1 for PDTO port

1.7 (1.5) PDTC port / 2.3 (1.9) PDTO port— 6:1 for both ports

Dimensions (end-to-end)

VB-3766, VB-4332

3-3/8 in.

VB-3966

3-3/4 in.

Recommended actuators

Pneumatic

V-3000-1, V-3000-8003

Electric

VA-805x