DM-6520 pages

DM 652

Pressure Control Valves
Pressure reducer for steam up to 190 °C, liquids and gases up to 130 °C
Technical Data
Connection

G 1/2 - 2
DN 15 - 50
Nominal Pressure Inlet PN 16 - 40
Outlet PN 1 - 16
Inlet Pressure
up to 40 bar
0.02 - 12 bar in 7 setting ranges
Outlet Pressure
4 - 18 m3/h
Kvs-value
Tightness
acc. VDI/VDE-guideline 2174
(leakage rate K 0.05 % of Kvs-value)

Description

Medium-controlled pressure reducers are simple control valves
offering accurate control while being easy to install and maintain.
They control the pressure downstream of the valve without
requiring pneumatic or electrical control elements.
The DM 652 pressure reducing valve is a diaphragm-controlled
spring-loaded and balanced proportional control valve for
universal application.
This pressure reducer is manufactured from deep-drawn stainless
steel featuring excellent corrosion resistance. The valve cone is
fitted with a soft seal.
The spring module comprising spring cover, spring, setting
spindle, diaphragm and internal components, is connected to the
valve body only by means of a clamp ring and two bolts. Changing
the diaphragm or the complete spring assembly for a different
control pressure range is extremely simple and does not call for
special tools. The same applies to servicing and maintenance.
The outlet pressure to be controlled is balanced across the
diaphragm by the force of the valve spring (set pressure). As the
outlet pressure rises above the pressure set using the setting
spindle, the valve cone moves towards the seat and the volume of
medium is reduced. As the outlet pressure drops the valve control
orifice increases; when the pipeline is depressurised the valve is
open. Rotating the setting spindle clockwise increases the outlet
pressure.
The DM 652 pressure reducer requires a pilot line (to be installed
on-site).

body with valve

spring module

setting screw
(non increasing)

STANDARD EQUIPMENT

Sheet no. DM 652/2.1.051.1 - issue 31.08.2005

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All stainless steel construction
Non-rising setting spindle
Quick-release body clamp ring
Pilot line connection
Diaphragm protectd by PTFE foil
(only for pressure ranges 0.8 - 12 bar)

OPTIONS
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Pressure gauge connection
Internal pilot line
Oil and grease-free version for oxygen
Clean gas version with special connections
Water-cooled thermal protection for steam up to 220 °C
For toxic or hazardous media: sealed spring cover complete
with leakage line connection (incl. sealed setting spindle).
Must be installed with a leakage line capable of draining
leaking medium safely and without pressure
• Various diaphragm and seal materials suitable for your medium
• Special connections: Aseptic, ANSI or DIN flanges, welding
spigots; other connections on request
• Special versions on request
Operating instructions, Know How and Safety instructions must be
observed.
We reserve the right to alter technical specifications without notice.

Kvs-values [m3/h]
nominal
diameter

G
DN

Kvs-value

m3/h

1/2
15

3/4
20

1
25

1 1/4
32

1 1/2
40

2
50

4

5

6

12

16

18

Setting Ranges [bar], Nominal Pressure
0.02-0.12
PN 16-40/1

0.1-0.5
PN 16-40/1

0.3-1.1
PN 16-40/2.5

0.8-2.5
PN 16-40/6

Setting Ranges [bar], Nominal Pressure
2-5
PN 16-40/10

4-8
PN 16-40/16

6 - 12
PN 16-40/16

Permissible Reduction Ratio (max. p1/p2)
setting range
bar
0.02 - 0.12
0.1 - 0.5
0.3 - 1.1
0.8 - 12

nominal diameter
G 1/2 - 1
G 1 1/4 - 2
DN 15 - 25
DN 32 - 50
80
50
40
25
30
18
20
12

Pressure Tech 2000 Limited • Unit 6, Graphite Way, Hadfield, Glossop, Derbyshire SK13 1QG - GB • Tel. +44-1457-899307 • Fax +44-1457-899308