Home / Products / Hydraulic Valve / Directional Control Valve / R900587557 SV20PA1-45/M SV20PA1-4X/M SV20 Check Valve SL20 SL30

R900587557 SV20PA1-45/M SV20PA1-4X/M SV20 Check Valve SL20 SL30

Warranty: 12 Months just like OEM Pump

Mark: SENHENGYUAN Hydraulics
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Product Description

SV20/SL20/SL30 Hydraulic Check Valve (R900587557/SV20PA1-45/M/SV20PA1-4X/M) Short Description

This ISO 5781 compliant hydraulically controlled check valve features a high-precision poppet structure, max working pressure 315bar, nominal port size 20mm, and minimal internal leakage for reliable high-pressure sealing. With SV/SL dual models (SV without drain port, SL with drain port Y) and optional opening pressures, it enables one-way flow, hydraulic reverse flow and secure circuit locking, delivering low flow resistance and high transmission efficiency. Ideal for pressure holding, anti-backflow and pump protection in industrial hydraulics, construction machinery, hydraulic stations and injection molding machines. Fully interchangeable with original SV/SL series valves, it’s a direct replacement part for quick hydraulic system maintenance, no pipeline or mounting modification needed.

Type Code:

01	02	03	04	05	06		07		08		09	10	11	12	13	14
S	V					–	4X	/		–						*

Pilot oil return internal = V Pilot oil return external = L

01	Check valve	S
02	Pilot oil return, internal	V
03	Size 10	10
	Size 20	20
	Size 32	30
Type of connection
04	Subplate mounting	P
04	Threaded connection	G
05	With pre-opening	A
05	Without pre-opening	B
Cracking pressure
06	See characteristic curves (A → B)	1
		2
		3
		4
07	Component series 40 … 49 (40 … 49: unchanged installation and mounting dimensions)	4X
Spool position monitoring
08	Without position switch	no code
	With position switch ¹⁾	QMG24
	For more information see "Electrical connection"
Orifice fitting channel Y
09	Channel Y closed (standard)	Y99
09	Orifice Ø** in channel Y ²⁾	Y**
Seal material
10	NBR seals	N
	FKM seals	V
	Observe compatibility of seals with hydraulic fluid used. (Other seals upon request)
Corrosion resistance
11	None	no code
11	Improved corrosion protection (240 h salt spray test according to EN ISO 9227)	J3
12	Standard	no code
	Pilot pressure p_pilot from channel X	SO168
	Control open spool with shaft sealing (between channel X–Y and Y–A)	SO286
Connection thread (versions with threaded connection "G" only)
13	Pipe thread "G" according to ISO 228-1	no code
13	Pipe thread “UNF/UN” according to ANSI/ASME B 1.1	/12
14	Further details in the plain text	*

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