The Rexroth Z1S6A50-4X/V (material no. R901086075) is a genuine Bosch Rexroth check valve: size 6, A1 → A2, with mechanical actuation.
A pilot-operated check valve lets oil flow freely in one direction and holds the load in the other until the pilot pressure opens it, so cylinders do not drift when the directional valve is in neutral.
More Rexroth hydraulic and linear-motion parts: Bosch Rexroth range.
The Rexroth product description reads: “Industrial hydraulic valve in a high performance range. Reliable blocking of the oil flow according to the hydraulic symbol”
Technical data
| Material number | R901086075 |
|---|---|
| Type code | Z1S6A50-4X/V |
| Operating pressure, max. | 350 bar |
| Max. flow | 40 l/min |
| Spool symbol | A1 → A2 |
| Type of connection | Sandwich plate |
| Size | 6 |
| Type of actuation | with mechanical actuation |
| Number of ports | 4 |
| Number of switching positions | 2 |
| Electrical connection description | 0 |
| Seals | FKM |
| Weight | 0.78 kg |
| Hydraulic fluids (per Rexroth) | HEES, HEPG, HETG, HFDR, HFDU, HL, HLP, HLPD, HVLP, HVLPD |
| Product family | Z1S6 |
| Data sheet | RD21534 |
| Brand | Bosch Rexroth |
| Condition | New, original |
Key features (per Rexroth)
- Direct actuated
- Leakage-free blocking in channel A
- Cracking pressure 5 bar
Typical applications
- Mobile and stationary hydraulics
- Stacked valve assemblies
- Presses and lifting tables
- Replacement of a leaking check valve
- Load holding on cylinders
Compatibility and replacement
Order with the 10-character material number R901086075; in Rexroth codes every character (size, pressure stage, adjustment element, options and seals) changes the part, so the type code Z1S6A50-4X/V on the nameplate should match exactly.
The values in the table come from the official Bosch Rexroth product data. If your old part shows a different series index (for example 5X instead of 6X), send us a photo and we will confirm the current equivalent.
What to check first
- Seal material
- Pilot ratio required by the circuit
- Cracking pressure
Frequently asked questions
What size is it?
Size 6 (NG6), according to the Bosch Rexroth product data.
How is it connected?
Sandwich plate, according to the Bosch Rexroth product data.
What is the maximum operating pressure?
350 bar, according to the Bosch Rexroth product data.
Which seal material is fitted?
FKM, according to the Bosch Rexroth product data.
Which hydraulic fluids can it be used with?
Rexroth lists HEES, HEPG, HETG, HFDR, HFDU, HL, HLP, HLPD, HVLP, HVLPD fluids for this part; check that the seal material suits your fluid.
Is it new and original?
Yes. We supply new, original parts in the manufacturer packaging, with a 1-year warranty.
Do you ship to my country, and what is the warranty?
Yes. RendatSP ships worldwide from Yiwu, China, by air in 5 to 7 days once the part is ready, and every part carries a 1-year warranty. Send the order number and quantity on WhatsApp and we will reply with a quotation.
Ordering tips
Send us the full order number from the label of the old part, or a clear photo of the label, together with the quantity you need. We check the number against the current manufacturer data before we quote and tell you if there is a newer replacement.
RendatSP ships from Yiwu, China, to factories worldwide; air delivery usually takes 5 to 7 days once the part is ready. The part is new and original with a 1-year warranty (shipping, payment and warranty). For a quotation, message us on WhatsApp with the order number and quantity. We also have agents in Saudi Arabia, Iraq, the UAE, Egypt, Oman, Libya, Morocco, Mauritania, Yemen, Algeria and Jordan.
