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hdf1dl2sm-rev0316

sandpiperpump

.

com

Model HDF1/HDF25 • 

4

Air-Operated Double Diaphragm (AODD) pumps are powered 

by compressed air or nitrogen.

The main directional (air) control valve 

 distributes 

compressed air to an air chamber, exerting uniform pressure 

over the inner surface of the diaphragm  

. 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 

.

As inner chamber pressure 

(P1)

 exceeds liquid chamber 

pressure 

(P2)

, the rod 

 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)

 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 

.

Suction (side) stroking also initiates the reciprocating 

(shifting, stroking or cycling) action of the pump. The suction 

diaphragm’s movement is mechanically pulled through its 

stroke. The diaphragm’s inner plate makes contact with an 

actuator plunger aligned to shift the pilot signaling valve. 

Once actuated, the pilot valve sends a pressure signal to the 

opposite end of the main directional air valve, redirecting the 

compressed air to the opposite inner chamber.

Principle of Pump Operation

Air Line

Discharged 

Fluid

Discharge

Stroke

Suction

Stroke

Primed

Fluid

2.57

65

6.89

175

"D"

16.73

425

 15.59

396

 

DISCHARGE PORT

1" FNPT (HDF1)

1" BSPT (HDF25)

AIR INLET

1/2" FNPT

14.03

356

2.38

60

"C"

.72

18

8.57

218

 "A" 

 "B" 

2.38

60

16.41

417

SUCTION PORT

1" FNPT (HDF1)

1" BSPT (HDF25)

(OPTIONAL 90

PORT ROTATION)

AIR EXHAUST

3/4" FNPT

8.56

217

9.00

229

4X 

.28 [7] MOUNTING HOLE

 

NOTE:

UNIT FURNISHED WITH SUB-BASE PLATE

AND RUBBER FEET AS STANDARD. FOR

STATIONARY BOLT DOWN USE, RUBBER

FEET CAN BE REMOVED.

HDF1 / HDF25

HEAVY DUTY FLAP VALVE PUMP

DIMENSIONAL TOLERANCE  1/8 [3]

[XX] = MILLIMETERS

PUMP 

COFIGURATION

DIM "A"

DIM "B"

DIM "C"

DIM "D"

ALUMINUM 

CENTER SECTION

3.95 [100]

5.86 [149] 11.12 [282] 14.55 [370]

CAST IRON 

CENTER SECTION

4.10 [104]

5.54 [141] 10.80 [274] 15.75 [400]

PULSE OUTPUT 

CONFIGURATION

SUCTION & DISCHARGE CONNECTIONS

HDF1

1" NPT FEMALE THREADED 

CONNECTIONS

HDF25

1" BSP TAPERED FEMALE 

THREADED CONNECTIONS

SAFE AIR

EXHAUST

DISPOSAL

AREA

PUMP INSTALLATION AREA

1"  DIAMETER AIR

EXHAUST PIPING

1"  DIAMETER AIR

EXHAUST PIPING

1"  DIAMETER AIR

EXHAUST PIPING

MUFFLER

LIQUID

LEVEL

SUCTION

LINE

LIQUID

LEVEL

SUCTION

LINE

MUFFLER

MUFFLER

SUBMERGED ILLUSTRATION

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 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.

UNIVERSAL ALL AODD

2: INST

AL

 & OP

Summary of Contents for Sandpiper HDF1

Page 1: ...ax 419 522 7867 SANDPIPERPUMP COM Copyright 2016 Warren Rupp Inc All rights reserved 9 00 229 NOTE UNIT FURNISHED WITH SUB BAS AND RUBBER FEET AS STANDAR STATIONARY BOLT DOWN USE FEET CAN BE REMOVED Q...

Page 2: ...e internal portions of the pump i e dry running For further guidance on ATEX applications please consult the factory When the pump is used for materials that tend to settle out or solidify the pump sh...

Page 3: ...ECTION 3 EXPLODED VIEW 7 Composite Repair Parts Drawing Composite Repair Parts List Material Codes SECTION 4 AIR END 10 Air Distribution Valve Assembly Air Valve with Stroke Indicator Assembly Pilot V...

Page 4: ...SPT Tapered Thread Discharge Porting Position D Bottom Your Serial fill in from pump nameplate ______________________________________ __ __ _____ __ ___ __ __ __ Pump Pump Pump Options Discharge Diaph...

Page 5: ...21 C 0 F 18 C Santoprene Injection molded thermoplastic elastomer with no fabric layer Long mechanical flex life Excellent abrasion resistance 275 F 135 C 40 F 40 C UHMW PE A thermoplastic that is hig...

Page 6: ...3 4 FNPT 8 56 217 9 00 229 4X 28 7 MOUNTING HOLE NOTE UNIT FURNISHED WITH SUB BASE PLATE AND RUBBER FEET AS STANDARD FOR STATIONARY BOLT DOWN USE RUBBER FEET CAN BE REMOVED HDF1 HDF25 HEAVY DUTY FLAP...

Page 7: ...check valve and into the outer fluid chamber Suction side stroking also initiates the reciprocating shifting stroking or cycling action of the pump The suction diaphragm s movement is mechanically pu...

Page 8: ...performance A pressure regulating valve should be installed to insure air supply pressure does not exceed recommended limits Air Valve Lubrication The air distribution system is designed to operate W...

Page 9: ...nt of use air drier Clogged manifolds Clean manifolds to allow proper air flow Deadhead system pressure meets or exceeds air supply pressure Increase the inlet air pressure to the pump Pump is designe...

Page 10: ...nd Refurbishment Kit For cast iron centers with conductive polypropylene air valve body Bumpers Bushings Gaskets O rings Seals Plungers and Retaining Rings 476 341 000 Air End Refurbishment Kit With n...

Page 11: ...25 360 056 379 Gasket 1 26 360 057 360 Gasket 1 27 360 058 360 Gasket 1 28 518 205 156 Manifold 2 518 205 156 E Manifold 2 518 205 010 Manifold 2 518 205 010 E Manifold 2 518 205 110 Manifold 2 518 20...

Page 12: ...prene Rubber Color coded GREEN 366 Food Grade Nitrile 368 Food Grade EPDM 371 Philthane Tuftane 374 Carboxylated Nitrile 375 Fluorinated Nitrile 378 High Density Polypropylene 379 Conductive Nitrile 4...

Page 13: ...Body Valve 1 1C 132 037 357 Bumper 2 1D 165 129 157 Cap End 2 1E 170 032 330 1 4 20 X 3 4 Capscrew 8 1F 560 058 360 7 8 ID X 1 16 CS O Ring 8 Air Distribution Valve Servicing See repair parts drawing...

Page 14: ...retainer 1E Step 2 Remove end cap 1C Step 3 Remove spool part of 1A caution do not scratch Step 4 Press sleeve 1A from body 1B Step 5 Inspect O Ring 1D and replace if necessary Step 6 Lightly lubricat...

Page 15: ...t Valve Spool 1 4E 560 023 360 O Ring 4 4F 675 037 050 Retaining Ring 1 Pilot Valve Servicing With Pilot Valve removed from pump Step 1 Remove snap ring 4F Step 2 Remove sleeve 4B inspect O Rings 4C r...

Page 16: ...ay Diaphragm Service Drawing One Piece Bonded Diaphragm Service Drawing 2 29 20 18 3 54 37 15 55 16 14 34 39 19 17 46 13 40 37 54 52 24 24 32 2 29 20 18 3 54 37 15 55 16 14 34 39 19 17 46 13 40 37 44...

Page 17: ...together Torque values are called out on the exploded view Repeat procedure for second side assembly Allow a minimum of 15 minutes to elapse after torquing then re torque the assembly to compensate f...

Page 18: ...irective 2006 42 EC on Machinery according to Annex VIII This product has used Harmonized Standard EN809 1998 A1 2009 Pumps and Pump Units for Liquids Common Safety Requirements to verify conformance...

Page 19: ...chnical knowledge apply to the listed equipment AODD Pumps and Surge Suppressors Technical File No 203104000 1410 MER AODD Air Operated Double Diaphragm Pumps EC Type Examination Certificate No Pumps...

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