具有子母阀板的水力控制阀、缓闭止回阀等，使阀门延迟关闭，部分水通过泵与转子部件回流以达到泄压消除水锤压力的目的。但由于泄压时间较长，回流的水长时间冲击泵的叶轮，使泵转子部件反转速度加快，时间长会损坏泵转子部。
阀体下部通过联接螺钉与底盖联接，阀体上下两侧各有一个进出水口与管道联接，阀体内中部靠近上进出水口处有密封座，上阀板通过焊接与液压传动杆联接，下阀板通过螺母、液压传动杆一端的螺纹与液压传动杆联接，阀体上部通过法兰与液压腔联接。液压腔由液压腔座、液压腔盖、液压腔体和活塞组成，通过螺杆、螺母与阀体联成一体，液压腔座上有液压腔座套。
电磁阀EFG551A001MS
52100001 52100004 52100005 52000380
12600024 60562300 34600137 JBEF8320G174
SCG553A017 SCG551A419 18900001 NFB327A002
52100008 52000008 35500335 35500333
35500337 35500341 43004886 35500346
35500347 35500338 SCG551A005MS SCG551A017MS
SCG551A018MS SCG551A001MS SCG551A002MS EFG551H401MO
54200001 12600008 NFB370A047 NF8327B112
SCG531B001MS WSNF8551A421 SCB344A074 SC8344A074
SCE370A008MS EFG551G401M0 8215B50 E238A204
SCE238A004 SCXB320A178 EF8316G4 EF8210G4
8342G003 EFG551B401MO EF8316G54 EFG551H401MO
8344B60M0 8355A082 HT8344G44 8210G15
HT8316G74 E290A005 EF8025A224MO 8262G019
NBXB210B038 8320G200 NF327A011 SC8551A001MS
SC8551A017MS 43004158 8223G021 8360G071
EF8210G094 EF8210G056 EF8210G095 SCE210C094
电磁阀EFG551A001MS
238610-032-D 238614-058-D 238510-034-D 272614-155-D
272610-132-D 238714-006-D 238710-006-D 272610-058-D
238210-058-D 064982-005-D EF8551A001MS EF8551A017MS
EF8320G176 8320G184 EF8320G184 8320G186
EFG551H401 238610-058-D 099257-006-D WT8551A001MS
EF8551A001MS SCG551A201 8551B401 EF8344G370
WSNF8327B112 OFSF8263G206V NFG353A043 SCG353A051
EFG551H465 EFG551H466 EFG552G401MO 8210G94
HT8316G64 57000014 57000103 HT8316G64
HT8344G80 WSNF8327A112 8320G174 8210G009
EF8210G201 EF8262G212 NF8327B002 8344G072
8223G027 8263G205LT 8316G066 EF8320G174
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