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Features
Specifications
Dimensions

Features

– Zero governors maintain the gas pressure in the secondary side at around the atmospheric pressure regardless of changes in pressure and flow rate in the primary side.
– Available in a variety of models including a general use type (Type 1), high performance type (Type 2) and high capacity type (Type 11).
– For controlling the anticipated proportional mixing method.
– Some models can be used as a relief valve (safety valve).

Specifications

Standard specifications

Specifications for zero governor method

Maximum primary working pressure (P1)	※120kPa
Minimum primary working pressure (P2)	0.5kPa
Range of secondary pressure (P2) adjustable by the spring	Type 1－0.4 to 0kPa
Range of secondary pressure (P2) adjustable by the spring	Type 2・11－0.05 to +0.05kPa

* 1. Models A8, 10, and 13Z-1 are 10 kPa. (Operating temperature is 0 to 60 °C.)

Specifications for pressure equalizing valve method

Maximum primary working pressure (P1)	50kPa
Maximum secondary working pressure (P2)	30kPa
Maximum working differential pressure (P1-P2)	30kPa
Spring-set pressure	-0.05 to +0.05kPa

Note) 1 kPa = 101. 972 mmH2O (Operating temperature is 0 to 60 °C.)

Capacity (A8Z-1 to A50Z-1)

Model		A8Z-1	A10Z-1	A13Z-1	A20Z-1	A25･30Z-1	A40Z-1	A50Z-1
Capacity factor (K)		—	—	0.56	0.88	1.32	1.54	4.43
Differential pressure (P1-P2) kPa	0.5	1.7	2.8	4	6	9	11	31
	1	2.5	4	6	9	13	16	45
	2.5	3	5	9	14	21	25	70
	5	3	5	13	20	30	35	100
	10	3	5	18	28	42	49	141
	15	—	—	—	35	52	60	172
	20	—	—	—	40	60	70	199

Capacity (A20Z-2 to A75Z-1)

Model		A20Z-2	A25･30Z-2	A40Z-2	A50Z-2	A40Z-11	A50Z-11	A75Z-11
Capacity factor (K)		0.85	1.54	1.85	5.31	6.44	9.90	22.9
Differential pressure (P1-P2) kPa	0.5	6	11	13	38	46	70	163
	1	9	16	19	53	65	100	231
	2.5	13	25	30	85	102	157	365
	5	19	35	42	119	145	223	516
	10	27	49	59	169	205	315	730
	15	33	60	73	207	250	385	895
	20	38	70	84	239	289	445	1033

Dimensions

Dimensions（A8Z-1 to A50Z-1）

Model	A8Z-1	A10Z-1	A13Z-1	A20Z-1	A25Z-1	A30Z-1	A40Z-1	A50Z-1
A(mm)	50	60	74	112	140	140	140	220
B(mm)	74	78	108	105	141	142	144	221
C(mm)	16	20	21	25	27	28	30	51
D(mm)	□73	□73	φ116	φ116	φ169	φ169	φ169	φ246
E	Rc1/4	Rc3/8	Rc1/2	Rc3/4	Rc1	Rc11/4	Rc11/2	Rc2
Mass(kg)	0.2	0.2	1.0	0.7	1.3	1.4	1.4	9.3

Dimensions（A20Z-2 to A75Z-11）

Model	A20Z-2	A25Z-2	A30Z-2	A40Z-2	A50Z-2	A40Z-11	A50Z-11	A75Z-11
A(mm)	112	140	140	140	220	200	250	340
B(mm)	135	200	201	203	281	262	318	646
C(mm)	25	27	28	30	51	53	64	120
D(mm)	φ169	φ246	φ246	φ246	φ330	φ246	φ330	φ450
E	Rc3/4	Rc1	Rc11/4	Rc11/2	Rc2	Rc11/2	Rc2	JIS 5K3B Flange
Mass(kg)	1.5	5.5	5.5	5.5	15.0	7.0	18.0	55.0

Zero governor A -Z

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Features

Specifications

Dimensions