ZM-R

Blanketing Valve low pressure reducing valve

single-stage pressure reduction possible within a high-pressure range
large diaphragm area to increase the closing force
all function-relevant and product-contacting parts are made of stainless steel or Hastelloy
simple adjustment of set pressure (within the spring range)
any mounting position (taking the set pressure into account)
no external energy supply needed
high flow capacity reduces costs through the use of smaller valves
valve pallet is guided inside the housing to protect against harsh weather conditions, e.g., freezing of the valve pallet in extreme cold
reduction within the vacuum range is possible
high precision
can be used in explosion hazardous areas
sturdy housing design (PN 16)
maintenance-friendly design

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 ist 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 diaphragm 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 valve 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 diaphragm, (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 tank pressure increases, the valve pallet moves toward the seat, and the mass flow is reduced. When the desired tank pressure is reached, the valve will close.

If the tank pressure decreases, the valve will open. If the system is operated in a vacuum mode, vacuum pressures down to -200 mbar /-80 inch W.C. (relative pressure) can be achieved.

Dimensions

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

DN		15 / ½"	25 / 1''	50 / 2''	100 / 4''	15 / ½"	25 / 1''	50 / 2''	100 / 4''
a		214	214	–	–	8.43	8.43	–	–
b		168	168	–	–	6.61	6.61	–	–
c*		–	–	214 / 360	360 / 600	–	–	8.43 / 14.17	14.17 / 23.62
d	DIN	150	160	150	250 / 250	5.91	6.3	5.91	9.84 / 9.84
	ANSI	180	160	150	250 / 250	7.09	6.3	5.91	9.84 / 9.84
e		214	214	230	275 / 310	8.43	8.43	9.06	10.83 / 12.2
f		87	87	103	148 / 155	3.43	3.43	4.06	5.83 / 6.10

Dimensions in mm / inches *depends upon size of diaphragm

Dimensions

Selection of valve seat depending on flow rate

Size	Seat in mm / inches	Kvs	Number
25 / 1''	2,0 / 0.08	0,15	20
	4,5 / 0.18	0,60	45
	7,5 / 0.30	1,20	75
	10,0 / 0.39	1,70	100
	14,0 / 0.55	2,40	140
50 / 2''	14,0 / 0.55	2,80	140
	18,0 / 0.71	6,80	180
	26,0 / 1.02	14,50	260
100 / 4''	42,0 / 1.65	33,50	420
	55,0 / 2.17	68,00	550

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

Material selection for housing

Design	S	H
Housing	Stainless Steel	Hastelloy
Valve seat	Stainless Steel	Hastelloy
Valve pallet	Stainless Steel	Hastelloy
Valve seat sealing	FFKM	FFKM
Gasket	PTFE	PTFE
Diaphragm P	PTFE	PTFE	Marking P
Alternative: Diaphragm V	Viton	-	Marking V

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

Type of connection

FD	DIN 2501, PN 16	DIN
FA	ASME B16.5 CL 150 R.F.	ASME
G	Thread	G 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)	0,15	0,25	0,40	0,65	1,00	1,50	2,50	4,00	6,00	10,00	Sitz-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]
10	6,2 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
20	6,0 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
100	3,8 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)	0,15	0,25	0,40	0,65	1,00	1,50	2,50	4,00	6,00	10,00	Sitz-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]
10	28,9 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
20	28,0 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
100	18,0 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)	0,15	0,25	0,40	0,65	1,00	1,50	2,50	4,00	6,00	10,00	Sitz-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]
10	346 703	453 921	587 1174	741 1504	922 1871	1151 2336	1609 3266	2296 4661	3212 6512	5045 10241	Ø42,0 Ø55,0
20	335 681	446 906	574 1165	739 1500	921 1871	1151 2336	1609 3266	2296 4661	3212 6512	5045 10241	Ø42,0 Ø55,0
100	216 438	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

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.