Dwyer HHP User Manual

Model HHP Hydraulic Hand Pump

Specifications – Operating Instructions

DWYER INSTRUMENTS, INC.

Phone: [phone] www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361,U.S.A. Fax: [phone] e-mail: [e-mail]

Lit-By Fax: [phone]

BULLETIN TE-HHP

1/4 Female

NPT

8-11/32

[212]

9-1/8
[232]

3-3/16

[81]

4-7/32

[107] MAX

1/4 Female NPT

Pressure Port

4-13/16

[202]

4

3

2

5

6

7

8

10

Recommended

fluid level

(9*)

Fig. 1

SPECIFICATIONS
Output Ranges: 0 to 10,000 psi

(0 to 700 bar).
Process Connection: 1/4˝ female
NPT (quick fit).

Gage Connection: 1/4˝ female NPT.
Materials: Stainless Steel and

tempered glass.

Weight: 3.5 lbs (1.6 kg).

Model HHP Hydraulic Hand Pump generates

pressures up to 10,000 psi (700 bar). Scissor
action pump allows quick priming and pressure
generation. Use in conjunction with an analog or
digital pressure gage for a complete
calibration system.
The pump is designed with a large, see through
reservoir with a capacity of over 4 oz. A variety of
fill liquids can be used including mineral oil,
distilled water, and alcohol. The sealed stainless
steel and tempered glass construction provide
leak free operation.
Model HHP offers adjustable over pressure
protection, fine control, and a unique selector
switch to move from priming to high
pressure generation.

Figure 1 Key:

1. 1/4” NPT female connection to take master
instruments. E.g. Digital/Analog indicators.

2. Pressure release valve.

3. Fine control.

4. Front port: 1/4” NPT female.

5. 100cc’s Reservoir.

6. Reservoir filling plug.

7. Priming/High pressure selector.

8. Fluid inlet tube.

9. Rear port: 1/4˝ NPT female reserved for
valve pressure relief.

10. Pump Handles.

DWYER INSTRUMENTS, INC.

Phone: [phone] www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361,U.S.A. Fax: [phone] e-mail: [e-mail]

Lit-By Fax: [phone]

©Copyright 2003 Dwyer Instruments, Inc Printed in U.S.A. 5/03

WARNING: HIGH PRESSURE:
Uncontrolled release of high pressure is
hazardous to personnel and may cause
damage to equipment. Before
connection of any pressure component
to the HHP ensure that the
component(s) is/are isolated from the
pressure supply and any internal
pressure is released slowly. Do not
connect HHP to external pressure
source. Pressure built up internally
during use can be extremely high,
ensure that all connections are
made correctly.

GUIDELINES FOR USE:

1. Remove filling plug (6) and fill reservoir
(5) to the recommended level with the
appropriate fluid and replace plug.

2. Connect master instrument to pump via
connection (1) using the appropriate seals
and adaptors.

3. Connect instrument under test to
flexible hose/gage adaptor and attach to
pump via the quick-fit connection (4).

4. Adjust the Fine control (3) to
‘mid-travel’.

5. Ensure the pressure release valve (2) is
open (turn fully clockwise then one turn
anti-clockwise). Fully squeeze handles ‘in’
and turn the selector (7) to the
‘prime’ position.

6. Operate handles several times to expel
air from the pump. (Ensure that the fluid
inlet tube (8) remains immersed in fluid at
all times).

7. Close the release valve (2) fully
clockwise.

8. Prime system by squeezing handles
together and then releasing, allowing the
oil to enter the pump cylinder. Repeat as
necessary until system is fully primed and

low pressure is indicated on either the
master or test instrument.

9. With handles fully squeezed ‘in’ select
the ‘high’ pressure position on selector (7)
and operate handles to generate
approximate pressure.
Note: Smaller handle strokes enable
easier pressure generation at
high pressures.

10. Adjust pressure to required value
using the fine control (3).
Note: Pressure will fall slightly,
immediately after pressure generation due
to thermodynamic effects, but will stabilize
after a short time.

Warning: Do not exceed maximum
operating pressure indicated on pump
label!

11. To totally release pressure from the
system turn release valve (2) one turn anti­clockwise and select the ‘prime’ position
on selector (7) after first squeezing
handles fully in.
Note: Careful use of the release valve (2)
and fine control (3) enable a controlled
release of pressure, essential for
calibration purposes.

12. RESERVOIR FLUID LEVEL: If the fluid
level in the reservoir falls considerably
during use, a partial vacuum can be
created in the reservoir which may affect
the pump performance. To avoid this,
simply allow air to enter the reservoir by
partly unscrewing the filling plug (6).

13. SEAL REPLACEMENT: Dependent on
the frequency of use, the Main Piston Seal
(and others) will need replacing. Call
factory for replacement seal.