單向閥就是止回閥 旋啟式止回閥安裝位置不受限制，通常安裝于水平管路，但也可以安裝于垂直管路或傾斜管路上。

ATOS單向閥HR-012 50型：阿托斯電磁閥耐腐蝕性強，適用范圍廣

KR-012 /4
KR-012
JPQ-312
KG-033/210 20
KM-011/100 50
KM-015/210/50
KM-015/210/50
KQ-012/53
KQ-013 /53
KQ-014 53
KQ-022/53
KQ-023 53
KR-003 35
HZGO-A-031/315 31
HM-011/210
JPC-211/30 20
KM-011/210 50
KM-011/350 50
HR-012 50
HR-013 50
KR-013 35
KR-014/35
SP-COU-110DC/80
SP-COU-12DC/80
HR-014 50
HR-014 50
HR-016/4/11
HS-011/100/31
HZGO-A-031/210 31
JPQ-224
JPR-212 16
RZMO-AE-010/315/I
RZMO-P1-010/100 20
KR-003 35
SP-COU-24DCRZMO-A-010/100 20
RZMO-A-010/315 20
PFE 31028/3DV
PFE 32028/3DV
QU-20/2 53
QV-06/1
QV-06/16 60
KZGO-A-031/210 20
RZGO-AE-010/210 10
RZGO-TERS-PS-010/100
RZMO-AE-030/210 40
RZMA/UL-A-010/250/NPT 20
SP-COI-110/50/60AC /80
KG-031/210 21
KG-031/100
LIFC-2S431 30
LIMM-2/210 20
LIQZO-TE-252L4/I 61
RMU-010/350 10
MAP-040/20（MAP-40/M06）
MAP-160 20
RZGO-A-033/315 31
RZGO-AE-010/100 2
SP-COI-230/50/60AC /80
RZMO-P1-010/50 20
RZGO-A-033/100 31
SCLI-25331
SCLI-40331 31
SP-CAE-24DC/10
SP-CAI-230/50/60/80
SP-CART ARE-20/315/R10
RZGO-A-010/210 20
RZMO-A-030/210 40
RZMO-A-030/315 40
KM-012/350 50
KM-013/210
SP-CART-M6/210
SP-CART-M6/350
QVKZOR-TE-10/90
RMU-010/210 10
RZGO-A-033/210 31
SP-CART M.5/210
MAP-320 20（MAP-320/M06）
RZGO-A-033/210 31 HQ-012 52
HR-003/30
RZMO-P1-010/315 20
SP-CART M.5/100
-06/24/60
QV-06/6/60
QVHZO-A-06/12 20
QVHZO-A-06/3 20
QVHZO-A-06/36 20
SP-CART-M6/100