Ham-Let H-900 SERIES Data Sheet

RELIEF VALVES

H-900 SERIES

VALVES & ACTUATORS

FEATURES

n

H-900 is available as CE/PED products

n

316 St.St. Construction

n

Service 10-225 psi

n

MAWP* 300 psi

n

One spring for all set pressure range

n

Available in all pipe threads and LET-LOK® connectors

n

Sizes: 1/4" or 6mm

* Maximum Allowed Working Pressure.

GENERAL

The H-900 series is a relief valve for low pressure service.
The valve is normally closed. It will open when the system pressure
reaches the set level. It will re-close when the system pressure falls
below the set level.

1

2

3

VALVES & ACTUATORS

MATERIALS OF CONSTRUCTION

Item No. Components Qty. Valve Body Material

Cap Plug 1 Polypropylene

1

Adjustment Cap

2

Cap Lable 1 Polyester

3

Locking Nut

4

Upper Spring Button

5

Spring

6

Lower Spring Button 1 St.St. 316

7

Bonnet 1 St.St. 316

8

O-ring

9

O-ring 1 Fluorocarbon FKM

10

Retaining Ring

11

Stem 1 St.St. 316

12

Bonded Poppet

13

Insert 1 St.St. 316

14

Packing

15

Ring 1 St.St. 316

16

Body

17

STANDARD CONFIGURATION DIMENSIONS

Connection / size

Description

H-900
H-900
H-985
H-995

Inlet Outlet

1/4 LET-LOK®1/4 LET-LOK

6MM LET-LOK®6MM LET-LOK

1/4 Male NPT 1/4 Female NPT 32 1.26 30 1.18 40 1.57 88.6 3.49
1/4 Male NPT 1/4 LET-LOK

1 St.St. 316

1 St.St. 316
1 St.St. 316
1 St.St. 302

1 Fluorocarbon FKM

1 PH15 - 7 Mo

1 St.St. 316 Bonded with Fluorocarbon FKM

1 PTFE

1 St.St. 316

Orifce

mm inch mm inch mm inch mm inch mm inch

®

®

4.8 0.19

®

ABCD

37 1.45 39 1.53 50 1.97 96 3.78
37 1.45 39 1.53 50 1.97 96 3.78

32 1.26 39 1.53 50 1.97 88.6 3.49

Dimensions

4

5

6

7

8

9

10

11

12

13

Lock
Wire Holes

B

C

RELIEF VALVES H-900 SERIES

284

D

A

14

15

16

17

CLEANING & PACKAGING

Every H-900 series Relief valve is cleaned in accordance
with Standard Cleaning and Packaging (procedure 8184).
Oxygen Clean & Lubricant Free Cleaning and packaging, in
accordance with Special Cleaning and Packaging
(procedure 8185), is available as an option.

TESTING

The HAM-LET H-900 Relief Valve designs have been tested for
Proof and Burst.
Every H-900 Relief Valve is factory tested for proper set and
resealing preformance.

PRESSURE TEMPERATURE RATING

Series H-900 Size: 1/4"

Seal Meterial Fluorocarbon FKM Buna N Polychloroprene (CR) EPDM

TEMP °C (°F)

-40 (-40) - - -

-34 (-30) - -

-23 (-10) -

-18 (0)

-12 (10)

-4 (25)

-1 (30)

10 (50)

65 (150)

93 (200)

121 (250)

135 (275)
148 (300) -

225 (15.5)

SETTING AND RESEALING PRESSURE

n

Upstream set pressure is the rst indicator of ow process.

Every pressure relief after the rst indication is repeatable within
a deviation of 5% at room temperature.

n

Blocked upstream set pressure is the rst indicator of a stopped

ow process and is always lower than the set pressure.

n

Calculation of set pressure valve design demands
back pressure consideration as the system back pressure
increases the set pressure. To balance the system, the back pressure
must be multiplied by 0.8 and the result shall be subtracted from
the required set pressure.

n

Lubricant free cleaned valves have higher reseal pressure

MAX SET PRESSURE psig (bar)

225 (15.5)

225 (15.5)

225 (15.5)

H900 RESEAL PRESSURE

FLOW DATA AT 70°F (20ºC)

Series

Orice in fully open mode is 4.8mm (0.19 inch)

SPRING 10-225psig

WATER FLOW AIR FLOW

Water Flow (LPM)

Pressure Drop (Psi)

Water Flow (US.GPM)

Pressure Drop (bar)

H-900

300

250

200

150

100

Inlet Pressure (Psi)

50

Test Set Pressure

10 - 20 (0.68 to 1.3) 50

175 - 225 (12.0 to 15.5)

0

100 200

225 psi

0

0

24

psig (bar)

Air Flow (SLPM)

Air Flow (SLPM)

150 psi

100 psi

6 8 10

Air Flow (SCFM)

Min Resealing Pressure

Percentage of set

300 400 500

50 psi

12 14

as a

pressure, %

90

VALVES & ACTUATORS

20.7

17.2

13.8

10.3

6.9

Inlet Pressure (bar)

3.5

0

16 18 20

HAM-LET ADVANCED CONTROL TECHNOLOGY

285

APPLICATIONS

H-900 relief valves gradually open when pressure
increases.
As such, they are not certied to ASME due to not having
capacity rating at a given pressure rise (accumulation).

H-900 SERIES ORDERING INFORMATION

OPERATION

H-900 relief valves open when the system pressure gets to the set
pressure and close when the system pressure drops below the set
pressure.

Warning

Valves that were not actuated for some time may contain

n

pressure higher than the set pressure.

System designer and users shall determine what system

n

applications require using relief valves to meet specic safety
codes and which valves conform to such codes.

OPTIONAL

VALVES & ACTUATORS

Valve Series

Valve Type

- LET-LOK® Ends

00

- Male to Female End

85

- Male to LET-LOK

95

H - 9

00

®

End

-

Body Material

- 316St.St.

SS

End Connection

- LET-LOK®

L

- NPT

N

- ISO Tapered

R

- NPT to LET-LOK

NL

For other end connections,
please contact HAM-LET
representative.

®

- --

LSS SL1/4

End Connection Size

1/4 6MM

Spring Designator

- Silver Code For Spring

SL

Range 10 - 225 psi

Factory Calibration
Designator

10-225 Psi

Example: H-900-SS-L-1/4-SL120

Will be Calibrated to 120 Psi

ORDERING INFORMATION FOR SPARE KITS

SPRING KIT SEAL KIT

Includes: Spring, Label, Wire and Lock

Includes: O-rings, Bonded Poppet and Label

--

Seal Material

- Fluorocarbon FKM

BLANK

- Buna N

BU

- EPDM

EP

-

NE

CE/PED Certification

BLANK
CE

Treatment

BLANK - Standard Cleaning &

OC - Oxygen Clean
LF - Lubricant Free

Polychloroprene (CR)

- Standard testing

- Certication PED

97/23/EC

Passivation

-

Z - 900 - SPK - 1/4

Body Designator
per End Connection

1/4 for all end connections

n For oxygen applications work shall be carried out according to procedures for

working with oxygen. In case spare kits are ordered for oxygen clean valves, such
kits have to be ordered as oxygen clean by adding "-OC" designator.
Example: Z-900-SK-1/4-VI-OC

Warning!

The system designer and user have the sole responsibility for selecting products suitable for their special
application requirements, ensuring their safe and trouble-free installation, operation, and maintenance. Ap­plication details, material compatibility and product ratings should all be considered for each selected product.
Improper selection, installation or use of products can cause property damage or personal injury.

RELIEF VALVES H-900 SERIES

286

Z - 900 - SK - 1/4 - VI

Body Designator
per End Connection

1/4 for all end connections

Seal Material

- Fluorocarbon FKM

VI

- Buna N

BU

- EPDM

EP

- Polychloroprene (CR)

NE

H-900

, Rev.11,

January 2015