Figure 14. Aircraft Service Mechanical Symbols

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MIL-HDBK 1028/6A

SYMBOL

COMPONENT DESCRIPTION

MAIN SHUTOFF VALVE 3 IN. BUTTERFLY VALVE, 200 PSI RATED,

ALUMINUM-BRONZE DISC AND METAL-REINFORCED BUNA-N CARTRIDGE SEAT

FOR BUBBLE-TIGHT SEAL ONE PIECE SHAFT, LUGGED BODY, WITH

EXTENSION SHAFT AND MIN. EIGHT-POSITION LOCKING LEVER OPERATOR.

MIN. FLOW 2700 SCFM AT 90 PSIG, WITH 2 PSI PRESSURE DROP.

MAIN CONTROL VALVE, 3 IN. AXIAL FLOW VALVE WITH NITRILE RUBBER

SEALING SLEEVE, CLASS 150 MAX. PRESSURE 250 PSIG OR GREATER,

MIN. FLOW 2700 SCFM AT 90 PSIG IN, 78 PSIG OUT, WITH BOLTING

SET FOR MOUNTING BETWEEN FLANGES EQUAL TO GROVE MODEL 83.

OUTPUT PRESSURE SELECTOR VALVE, THREE-WAY BALL VALVE, 3/8 IN.

NPT PORTS, BRASS CONSTRUCTION, PANEL MOUNTED WITH BLACK NYLON

OR METAL LEVEL HANDLE, MIN. Cv = 2.0.

OUTPUT BLOWDOWN VALVE, TWO-WAY, TWO PORT SPOOL VALVE BRONZE,

WITH AIR PILOT AND SPRING RETURN. 1-IN. NPT PORTS, CvMIN = 8.0

WITH EXHAUST MUFFLER EQUAL TO VERSA VSP 7702, W/SCHRADER

4816-1000 SILENCER.

START CONTROL VALVE, TWO-WAY, TWO PORT SPOOL VALVE, WITH PALM

BUTTON OPERATOR AND SPRING RETURN BRONZE, FOR PANEL MOUNTING

1/4 IN. NPT PORTS. CvMIN = 1.2. NORMALLY CLOSED. EQUAL TO

VERSA VSI-2301-P.

STOP CONTROL VALVE. THREE-WAY, TWO-OUTLET BRONZE SPOOL VALVE

WITH PALM BUTTON OPERATOR AND SPRING RETURN FOR PANEL MOUNTING.

1/4 IN. NPT PORTS. CvMIN = 1.2. EQUAL TO VERSA VSI-7302-P

W/DUST EXCLUDER AT EXHAUST.

START CONTROL LATCH VALVE. THREE-WAY, TWO-OUTLET BRONZE SPOOL

VALVE WITH AIR PILOT AND SPRING RETURN. 1/4 IN. NPT PORTS,

CvMIN = 1.2. EQUAL TO VERSA VSP-7302 W/DUST EXCLUDER AT

EXHAUST.

START LATCH SHUTTLE VALVE. TWO-INLET, ONE-OUTLET, BRASS CROSS

SHUTTLE VALVE 3/8 IN. NPT PORTS. CvMIN = 1.2. EQUAL TO VERSA

SV-4.

OPENING SPEED CONTROL VALVE. MICROMETER ADJUST NEEDLE VALVE,

1/4 IN. NPT PORTS, BRASS W/SS TRIM, BUNA-N SEALS, WIDE OPEN

CvMIN = 0.60.

Figure 14

Aircraft Service Mechanical Symbols