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Dimensional Drawings 1: PUMP SPECS ST1 & ST25 Containment Duty Dimensions are ±1/8". Figures in parentheses = millimeters. 14.60 371 14.26 362 DISCHARGE PORT 1" NPT (ST1) 1" BSPT (ST25) 8.82 224 7.12 181 5.54 141 4.10 104 15.50 394 12.52 318 8.57 218 4.61 117 SUCTION PORT 1" NPT (ST1) 1" BSPT (ST25) 6.89 175 8.56 217 9.75 248 .72 18 9.00 229 10.19 259 4X .28 MOUNTING HOLE 7 NOTE: UNIT FURNISHED WITH SUB-BASE PLATE AND RUBBER FEET AS STANDARD FOR STATIONARY BOLT DOWN USE, RUBBER FEET CAN BE REMOVED 9.00 229 8.56 217 3 • Model ST1/ST25 www.sandpiperpump.com st1dl5sm-rev0515
Principle of Pump Operation Air-Operated Double Diaphragm (AODD) pumps are powered by compressed air or nitrogen. Air Line Discharged Fluid The main directional (air) control valve 1 distributes compressed air to an air chamber, exerting uniform pressure over the inner surface of the diaphragm 2. At the same time, the exhausting air 3 from behind the opposite diaphragm is directed through the air valve assembly(s) to an exhaust port 4. As inner chamber pressure (P1) exceeds liquid chamber pressure (P2), the rod 5 connected diaphragms shift together creating discharge on one side and suction on the opposite side. The discharged and primed liquid’s directions are controlled by the check valves (ball or flap)6 orientation. The pump primes as a result of the suction stroke. The suction stroke lowers the chamber pressure (P3) increasing the chamber volume. This results in a pressure differential necessary for atmospheric pressure (P4) to push the fluid through the suction piping and across the suction side check valve and into the outer fluid chamber 7. 2: INSTAL & OP Discharge Stroke Suction Stroke PUMP INSTALLATION AREA Suction (side) stroking also initiates the reciprocating SAFE AIR EXHAUST (shifting, stroking or cycling) action of the pump. DISPOSAL The suction diaphragm’s movement is mechanically pulled through AREA its 1" DIAMETER stroke. AIR The diaphragm’s inner plate makes contact with an EXHAUST PIPING actuator plunger aligned to shift the pilot signaling valve. Once actuated, the pilot valve sends a pressure MUFFLER signal to the opposite end of the main directional air valve, redirecting the compressed air to the opposite inner chamber. Primed Fluid SUBMERGED ILLUSTRATION MUFFLER LIQUID LEVEL 1" DIAMETER AIR EXHAUST PIPING SUCTION LINE Pump can be submerged if the pump materials of construction are compatible with the liquid being pumped. The air exhaust must be piped above the liquid level. When the MUFFLER pumped product source is at a higher level than the pump (flooded suction condition), pipe the exhaust higher than the product source to prevent siphoning spills. LIQUID LEVEL 1" DIAMETER AIR EXHAUST PIPING SUCTION www.sandpiperpump.com LINE Model ST1/ST25 • 4 st1dl5sm-rev0515
- Page 1 and 2: SERVICE & OPERATING MANUAL Original
- Page 3 and 4: Table of Contents SECTION 1: PUMP S
- Page 5: Performance ST1 & ST25 Containment
- Page 9 and 10: Filling the Driver Chambers with Li
- Page 11 and 12: Composite Repair Parts Drawing 35 2
- Page 13 and 14: Material Codes - The Last 3 Digits
- Page 15 and 16: Pilot Valve Assembly 4F 4A 4E 4C 4D
- Page 17 and 18: EC Declaration of Conformity In acc
Dimensional Drawings<br />
1: PUMP SPECS<br />
ST1 & ST25 Containment Duty<br />
Dimensions are ±1/8". Figures in parentheses = millimeters.<br />
14.60<br />
371<br />
14.26<br />
362<br />
DISCHARGE PORT<br />
1" NPT (ST1)<br />
1" BSPT (ST25)<br />
8.82<br />
224<br />
7.12<br />
181<br />
5.54<br />
141<br />
4.10<br />
104<br />
15.50<br />
394<br />
12.52<br />
318<br />
8.57<br />
218<br />
4.61<br />
117<br />
SUCTION PORT<br />
1" NPT (ST1)<br />
1" BSPT (ST25)<br />
6.89<br />
175<br />
8.56<br />
217<br />
9.75<br />
248<br />
.72<br />
18<br />
9.00<br />
229<br />
10.19<br />
259<br />
4X .28 MOUNTING HOLE<br />
7<br />
NOTE:<br />
UNIT FURNISHED WITH SUB-BASE PLATE<br />
AND RUBBER FEET AS STANDARD FOR<br />
STATIONARY BOLT DOWN USE, RUBBER<br />
FEET CAN BE REMOVED<br />
9.00<br />
229<br />
8.56<br />
217<br />
3 • Model ST1/ST25<br />
www.sandpiperpump.com<br />
st1dl5sm-rev0515
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