ZM-R

ZM-R

Blanketing Valve

low pressure reducing valve

Function and Description

The blanketing valve type ZM-R is a highly developed low pressure reducing valve. This valve is typically used to inert or blanket tanks, vessels or other process systems with nitrogen or other blanketing gases by controlling the tank pressure to its desired value. High nitrogen or blanketing gas supply pressures up to 16 bar / 232 psi are safely reduced down to only a few mbar / inch W.C..

The ZM-R low pressure reducing valve is a direct acting one stage pressure control device. It is designed as a membrane controlled, spring loaded proportional acting valve. The valve controls the tank pressure by increasing flow as the tank pressure drops. This means that the mass flow through the device depends on the pressure differential of the set pressure to the actual tank pressure. When the actual tank pressure reaches the set pressure the control unit closes and there is no flow.

At the control membrane (which can be made from PTFE or Viton) the tank pressure (P2) is balanced with the adjustment spring and the supply pressure (P1). In a depressurized tank the adjustment spring holds the valve pallet in the fully open position. As the tankpressure increases the valve pallet moves toward the seat and the mass flow is reduced. When the desired tank pressure is reached the device will close.

Should the tank pressure decrease the valve will open. If the plant is operated in a vacuum mode pressures down to -200 mbar / -80 inch W.C. relative pressure can be accommodated.

Features and Advantages

  • one stage pressure reduction within a relatively high pressure range
  • large membrane surface to increase the closing force
  • all functional and wetted parts are made of stainless steel (or hastelloy if required)
  • easy adjustment of set pressure (within the pressure range of the specific spring)
  • vertical or horizontal installation (set pressure has to be adjusted for horizontal installation)
  • no external energy supply required
  • optimized flow performance, which reduces capital cost to a minimum as smaller sized vents are needed
  • the valve pallet is guided within the housing to protect against harsh weather conditions, e.g. preventing freezing of pallet in cold weather conditions
  • reducing within the vacuum range is possible
  • high accuracy
  • can be installed in explosion hazardous areas
  • housing designed to 16 bar / 150 psi
  • maintenance friendly design

Dimensions

To select the nominal size (DN), please use the flow capacity charts on the following pages

DN15 / ½"25 / 1''50 / 2''100 / 4'' 15 / ½"25 / 1''50 / 2'' 100 / 4''
a2142148.438.43
b1681686.616.61
c*214 / 360360 / 6008.43 / 14.1714.17 / 23.62
dDIN150160150250 / 2505.916.35.919.84 / 9.84
ANSI180160150250 / 2507.096.35.919.84 / 9.84
e214214230275 / 3108.438.439.0610.83 / 12.2
f8787103148 / 1553.433.434.065.83 / 6.10
DN15 / ½"25 / 1''50 / 2''100 / 4'' 15 / ½"25 / 1''50 / 2'' 100 / 4''
a2142148.438.43
b1681686.616.61
c*214 / 360360 / 6008.43 / 14.1714.17 / 23.62
dDIN150160150250 / 2505.916.35.919.84 / 9.84
ANSI180160150250 / 2507.096.35.919.84 / 9.84
e214214230275 / 3108.438.439.0610.83 / 12.2
f8787103148 / 1553.433.434.065.83 / 6.10

Dimensions in mm / inches *depends upon size of diaphragm

Dimensions

Selection of valve seat depending on flow rate

Size Seat in mm / inchesKvsNumber
25 / 1''2,0 / 0.080,1520
4,5 / 0.180,6045
7,5 / 0.301,2075
10,0 / 0.391,70100
14,0 / 0.552,40140
50 / 2''14,0 / 0.552,80140
18,0 / 0.716,80180
26,0 / 1.0214,50260
100 / 4''42,0 / 1.6533,50420
55,0 / 2.1768,00550
Size Seat in mm / inchesKvsNumber
25 / 1''2,0 / 0.080,1520
4,5 / 0.180,6045
7,5 / 0.301,2075
10,0 / 0.391,70100
14,0 / 0.552,40140
50 / 2''14,0 / 0.552,80140
18,0 / 0.716,80180
26,0 / 1.0214,50260
100 / 4''42,0 / 1.6533,50420
55,0 / 2.1768,00550

*1 Kvs = 0.86 Cv; 1 Cv = 1.17 Kvs

ZM-R

Material selection for housing

Design SH
HousingStainless SteelHastelloy
Valve seatStainless SteelHastelloy
Valve palletStainless SteelHastelloy
Valve seat sealingFFKMFFKM
GasketPTFEPTFE
Diaphragm PPTFEPTFEMarking P
Alternative: Diaphragm VViton-Marking V
Design SH
HousingStainless SteelHastelloy
Valve seatStainless SteelHastelloy
Valve palletStainless SteelHastelloy
Valve seat sealingFFKMFFKM
GasketPTFEPTFE
Diaphragm PPTFEPTFEMarking P
Alternative: Diaphragm VViton-Marking V

Optional: Inner part of housing electropolished. Special materials upon request

ZM-R

Type of connection

FDDIN 2501, PN 16DIN
FAASME B16.5; 150 lbs RFSFASME
GThreadG or NPT
FDDIN 2501, PN 16DIN
FAASME B16.5; 150 lbs RFSFASME
GThreadG or NPT

other types upon request

Flow rates for P2 pressure range (Europe - metric units)

ZM-R 15 / ZM-R 25: flow rate (air, 0°C) at ∆P = P1 - P2 and valve full open

P 1 (bar)0,150,250,400,651,001,502,504,006,0010,00Sitz-Ø
P 2 (bar)[Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][mm]
106,2
12,4
17,5
24,8
8,1
16,2
23,0
32,5
10,3
20,7
29,3
41,4
13,2
26,5
37,6
53,1
16,5
33,0
46,7
66,0
20,6
41,2
58,4
82,4
28,8
57,6
81,6
115,2
41,1
82,2
116,5
164,5
57,5
115,0
163,0
230,1
90,3
180,7
256,0
361,4
Ø4,5
Ø7,5
Ø10,0
Ø14,0
206,0
12,0
17,0
24,0
7,9
15,9
22,6
31,9
10,2
20,5
29,1
41,1
13,2
26,4
37,5
52,9
16,5
33,0
46,7
66,0
20,6
41,2
58,4
82,4
28,8
57,6
81,6
115,2
41,1
82,2
116,5
164,5
57,5
115,0
163,0
230,1
90,3
180,7
256,0
361,4
Ø4,5
Ø7,5
Ø10,0
Ø14,0
1003,8
7,7
10,9
15,4
6,7
13,4
18,9
26,8
9,4
18,9
26,8
37,9
12,8
25,6
36,3
51,3
16,4
32,8
46,5
65,6
20,6
41,2
58,4
82,4
28,8
57,6
81,6
115,2
41,1
82,2
116,5
164,5
57,5
115,0
163,0
230,1
90,3
180,7
256,0
361,4
Ø4,5
Ø7,5
Ø10,0
Ø14,0
200-
-
-
-
4,0
8,0
11,4
16,1
8,00
16,1
22,9
32,3
12,1
24,2
34,3
48,4
16,1
32,3
45,8
64,6
20,6
41,2
58,4
82,4
28,8
57,6
81,6
115,2
41,1
82,2
116,5
164,5
57,5
115,0
163,0
230,1
90,3
180,7
256,0
361,4
Ø4,5
Ø7,5
Ø10,0
Ø14,0
500-
-
-
-
-
-
-
-
-
-
-
-
7,8
15,6
22,1
31,2
14,2
28,5
40,4
57,0
20,1
40,3
57,1
80,7
28,8
57,6
81,6
115,2
41,1
82,2
116,5
164,5
57,5
115,0
163,0
230,1
90,3
180,7
256,0
361,4
Ø4,5
Ø7,5
Ø10,0
Ø14,0
P 1 (bar)0,150,250,400,651,001,502,504,006,0010,00Sitz-Ø
P 2 (bar)[Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][mm]
106,2
12,4
17,5
24,8
8,1
16,2
23,0
32,5
10,3
20,7
29,3
41,4
13,2
26,5
37,6
53,1
16,5
33,0
46,7
66,0
20,6
41,2
58,4
82,4
28,8
57,6
81,6
115,2
41,1
82,2
116,5
164,5
57,5
115,0
163,0
230,1
90,3
180,7
256,0
361,4
Ø4,5
Ø7,5
Ø10,0
Ø14,0
206,0
12,0
17,0
24,0
7,9
15,9
22,6
31,9
10,2
20,5
29,1
41,1
13,2
26,4
37,5
52,9
16,5
33,0
46,7
66,0
20,6
41,2
58,4
82,4
28,8
57,6
81,6
115,2
41,1
82,2
116,5
164,5
57,5
115,0
163,0
230,1
90,3
180,7
256,0
361,4
Ø4,5
Ø7,5
Ø10,0
Ø14,0
1003,8
7,7
10,9
15,4
6,7
13,4
18,9
26,8
9,4
18,9
26,8
37,9
12,8
25,6
36,3
51,3
16,4
32,8
46,5
65,6
20,6
41,2
58,4
82,4
28,8
57,6
81,6
115,2
41,1
82,2
116,5
164,5
57,5
115,0
163,0
230,1
90,3
180,7
256,0
361,4
Ø4,5
Ø7,5
Ø10,0
Ø14,0
200-
-
-
-
4,0
8,0
11,4
16,1
8,00
16,1
22,9
32,3
12,1
24,2
34,3
48,4
16,1
32,3
45,8
64,6
20,6
41,2
58,4
82,4
28,8
57,6
81,6
115,2
41,1
82,2
116,5
164,5
57,5
115,0
163,0
230,1
90,3
180,7
256,0
361,4
Ø4,5
Ø7,5
Ø10,0
Ø14,0
500-
-
-
-
-
-
-
-
-
-
-
-
7,8
15,6
22,1
31,2
14,2
28,5
40,4
57,0
20,1
40,3
57,1
80,7
28,8
57,6
81,6
115,2
41,1
82,2
116,5
164,5
57,5
115,0
163,0
230,1
90,3
180,7
256,0
361,4
Ø4,5
Ø7,5
Ø10,0
Ø14,0

Flow rates for P2 pressure range (Europe - metric units)

ZM-R 50: flow rate (air, 0°C) at ∆P = P1 - P2 and valve full open

P 1 (bar)0,150,250,400,651,001,502,504,006,0010,00Sitz-Ø
P 2 (bar)[Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][mm]
1028,9
70,3
150,0
37,9
92,1
196,5
48,3
117,4
250,4
61,9
150,4
320,8
77,0
187,1
399,1
96,2
233,6
498,3
134,5
326,6
696,5
191,9
466,1
994,0
268,5
652,1
1390
421,6
1024
2183
Ø14,0
Ø18,0
Ø26,0
2028,0
68,1
145,3
37,3
90,6
193,3
47,9
116,5
248,4
61,7
150,0
319,9
77,0
187,1
399,0
96,2
233,6
498,3
134,5
326,6
696,5
191,9
466,1
994,0
268,5
652,1
1390
421,6
1024
2183
Ø14,0
Ø18,0
Ø26,0
10018,0
43,8
93,5
31,2
75,9
162,0
44,2
107,4
229,1
59,9
145,5
310,2
76,6
186,1
396,9
96,2
233,6
498,3
134,5
326,6
696,5
191,9
466,1
994,0
268,5
652,1
1390
421,6
1024
2183
Ø14,0
Ø18,0
Ø26,0
200-
-
-
18,8
45,8
97,6
37,7
91,6
195,3
56,5
137,4
293,0
75,4
183,2
390,6
96,2
233,6
498,3
134,5
326,6
696,5
191,9
466,1
994,0
268,5
652,1
1390
421,6
1024
2183
Ø14,0
Ø18,0
Ø26,0
500-
-
-
-
-
-
-
-
-
36,4
88,6
188,9
66,6
161,7
344,9
94,1
228,7
487,8
134,5
326,6
696,5
191,9
466,1
994,0
268,5
652,1
1390
421,6
1024
2183
Ø14,0
Ø18,0
Ø26,0
P 1 (bar)0,150,250,400,651,001,502,504,006,0010,00Sitz-Ø
P 2 (bar)[Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][mm]
1028,9
70,3
150,0
37,9
92,1
196,5
48,3
117,4
250,4
61,9
150,4
320,8
77,0
187,1
399,1
96,2
233,6
498,3
134,5
326,6
696,5
191,9
466,1
994,0
268,5
652,1
1390
421,6
1024
2183
Ø14,0
Ø18,0
Ø26,0
2028,0
68,1
145,3
37,3
90,6
193,3
47,9
116,5
248,4
61,7
150,0
319,9
77,0
187,1
399,0
96,2
233,6
498,3
134,5
326,6
696,5
191,9
466,1
994,0
268,5
652,1
1390
421,6
1024
2183
Ø14,0
Ø18,0
Ø26,0
10018,0
43,8
93,5
31,2
75,9
162,0
44,2
107,4
229,1
59,9
145,5
310,2
76,6
186,1
396,9
96,2
233,6
498,3
134,5
326,6
696,5
191,9
466,1
994,0
268,5
652,1
1390
421,6
1024
2183
Ø14,0
Ø18,0
Ø26,0
200-
-
-
18,8
45,8
97,6
37,7
91,6
195,3
56,5
137,4
293,0
75,4
183,2
390,6
96,2
233,6
498,3
134,5
326,6
696,5
191,9
466,1
994,0
268,5
652,1
1390
421,6
1024
2183
Ø14,0
Ø18,0
Ø26,0
500-
-
-
-
-
-
-
-
-
36,4
88,6
188,9
66,6
161,7
344,9
94,1
228,7
487,8
134,5
326,6
696,5
191,9
466,1
994,0
268,5
652,1
1390
421,6
1024
2183
Ø14,0
Ø18,0
Ø26,0

Flow rates for P2 pressure range (Europe - metric units)

ZM-R 100: flow rate (air, 0°C) at ∆P = P1 - P2 and valve full open

P 1 (bar)0,150,250,400,651,001,502,504,006,0010,00Sitz-Ø
P 2 (bar)[Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][mm]
10346
703
453
921
587
1174
741
1504
922
1871
1151
2336
1609
3266
2296
4661
3212
6512
5045
10241
Ø42,0
Ø55,0
20335
681
446
906
574
1165
739
1500
921
1871
1151
2336
1609
3266
2296
4661
3212
6512
5045
10241
Ø42,0
Ø55,0
100216
438
374
759
529
1074
716
1455
917
1861
1151
2336
1609
3266
2296
4661
3212
6512
5045
10241
Ø42,0
Ø55,0
200-
-
225
458
451
916
676
1374
902
1832
1151
2336
1609
3266
2296
4661
3212
6512
5045
10241
Ø42,0
Ø55,0
500-
-
-
-
-
-
436
886
796
1617
1127
2287
1609
3266
2296
4661
3212
6512
5045
10241
Ø42,0
Ø55,0
P 1 (bar)0,150,250,400,651,001,502,504,006,0010,00Sitz-Ø
P 2 (bar)[Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][Nm³ / h][mm]
10346
703
453
921
587
1174
741
1504
922
1871
1151
2336
1609
3266
2296
4661
3212
6512
5045
10241
Ø42,0
Ø55,0
20335
681
446
906
574
1165
739
1500
921
1871
1151
2336
1609
3266
2296
4661
3212
6512
5045
10241
Ø42,0
Ø55,0
100216
438
374
759
529
1074
716
1455
917
1861
1151
2336
1609
3266
2296
4661
3212
6512
5045
10241
Ø42,0
Ø55,0
200-
-
225
458
451
916
676
1374
902
1832
1151
2336
1609
3266
2296
4661
3212
6512
5045
10241
Ø42,0
Ø55,0
500-
-
-
-
-
-
436
886
796
1617
1127
2287
1609
3266
2296
4661
3212
6512
5045
10241
Ø42,0
Ø55,0

Flow rates for P2 vacuum range (Type ZM-R/N) upon request

Design Types and Specifications

Two different designs are available:

Blanketing valve for overpressure, standard design

ZM-R –

Blanketing valve for vacuum, standard design

ZM-R / N

Blanketing valve for overpressure, standard design

ZM-R –

Blanketing valve for vacuum, standard design

ZM-R / N

Other special devices can be supplied on request
For in-line valves any back pressure, which will influence the set pressure and opening characteristics, has to be taken into account.

Settings

Supply pressure:

+16 bar

+6424 inch W.C.

Set pressure for overpressure function:

+500 mbar

+200 inch W.C.

Set pressure for vacuum function:

-200 mbar

-80 inch W.C.

ZM-R
ZM-R
ZM-R