SD5 Monoblock Hydraulic Directional Control Valve Manual 45 L/min 250 Bar

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SD5 Features Technical Advantages

The SD5 Monoblock Hydraulic Directional Control Valve Manual 45 L/min 250 bar is built around a one-piece body rather than a stack of sections. That choice shapes everything below.

Control. Manual lever operation. There is no coil, no voltage matching, and no wiring to route. In environments where electrical supply is unreliable, or where the machine is maintained by mechanics rather than electricians, this removes a failure point rather than adding one.

Structure. Monoblock body, 1 to 12 sections. The one-piece design keeps the valve rigid under pressure and removes the section-to-section joint faces that are the usual source of external weeping on stacked valves.

Internal sealing. Internal leakage is 15 cc/min at 160 bar and 50°C. This figure describes how much oil bypasses the spool when it is centered. A lower number means the actuator holds position better under load, and less energy is lost as heat.

Oil compatibility. The valve runs on mineral oil based hydraulic oil with a viscosity range of 12 CST to 400 CST. That range covers cold start-up and sustained high-temperature running without requiring an oil change between seasons.

Temperature range. Ambient temperature is −40°C to +80°C (−40°F to +176°F). The valve is built to sit on equipment that works outdoors, in winter cold or summer heat, without additional heating or cooling.

Surface protection. The valve body is phosphating treated. Rustproof level passes a 48-hour neutral salt spray test. This matters on construction, agricultural and municipal equipment where moisture and road salt are part of daily operation.

Product Introduction

SD5 Monoblock Hydraulic Directional Control Valve Manual 45 L/min 250 bar is a monoblock hydraulic directional control valve for mineral oil based hydraulic systems. It is operated by hand, not by coil, and it is built as a single block rather than a stack of sections.

That single-block construction is the starting point for how the valve behaves. There are no joint faces between sections, so the leak paths that normally appear between stacked plates are not present. The spool and bore inside each section are a matched pair, machined to work together. Oil enters at P, returns at T, and is directed to the work ports marked A1B1 and A2B2. A relief valve sits on the P line.

This valve is available in 1 to 12 sections. It is intended for systems where the operator controls the function directly, and where the circuit needs more than one actuator from a single valve block.

Specifications

Notes on the figures

45 L/min nominal flow sets the working range. Above this, the valve is outside its intended flow band.

250 bar operating pressure is the working limit, not a burst figure.

15 cc/min internal leakage is measured at 160 bar and 50°C. It indicates how well the spool seals when centered.

12 to 400 CST is the oil viscosity band. Oil outside this range will affect response and wear.

1 to 12 sections means the buyer defines the circuit, and the valve is built to that circuit.

Dimensions from drawing: overall base length 137.5 mm, overall height 187.5 mm, top width 110 mm. Port markings on the drawing are P1, P, T, T1, N, A1B1 and A2B2. G3/8, M8 and M6 are marked on the dimension drawing.

SD5 Installation Maintenance

Mounting. The SD5 comes as a monoblock valve and can be ordered with 1 to 12 sections. Before you bolt it down, look at the port markings on the drawing: P1, P, T, T1, N, A1B1, A2B2. The dimension drawing also shows G3/8 and M8. Line the port pattern up first. Then tighten the valve down.

Electrical connection. Control on this model is manual. There is no coil, so no coil voltage applies.

Coil replacement. Not applicable here. This version has no coil to replace.

Maintenance. The valve runs on mineral oil based hydraulic oil. Keep viscosity between 12 CST and 400 CST. Nominal flow is 45 L/min. Operating pressure is 250 bar (25 MPa). Internal leakage measures 15 cc/min at 160 bar and 50°C. Ambient temperature range is −40°C to +80°C. The body is phosphating treated, and the rustproof level passes a 48-hour neutral salt spray test.

Inside, the spool and bore are machined as a matched pair. Dirt is the most common reason a spool stops moving freely. If the valve will not shift, look at the control linkage first. Then check the oil and the filtration.

Manual override. This model is manually controlled, so there is no separate override. The hydraulic schematic shows two spool sections, both with spring return, and a relief valve on the P line.

Why Choose Laiye for SD5 Valves

For the SD5 Monoblock Hydraulic Directional Control Valve Manual 45 L/min 250 bar, Laiye supplies pressure valve components built for hydraulic directional control.

Shijiazhuang Laiye Import Export Trading Co., Ltd operates as a subsidiary of Onederful. Laiye handles research, production and sales across a range of hydraulic products: hydraulic valves, directional valves, pressure valves, flow valves, accessories and special components.

Onederful dates back to 1988. The hydraulic valve production management team numbers more than 200 people. Each year, more than 10,000 containers of specialized products leave the factory and go to customers in more than 20 countries.

Before any batch ships, at least 10 inspection procedures are carried out. Laiye products sell in Russia, Europe, the Middle East, South America, Asia and other markets.

On the service side, Laiye provides technical analysis support. Sales managers bring hydraulic application experience to each inquiry. Multiple transportation vehicles sit near the port, which keeps delivery fast. Small pieces ship in carton boxes. Large pieces ship in exporting grade plywood cases. Freight can move by sea, by air, or through international express such as DHL, FEDEX and UPS. Warranty runs 12 months against B/L date. OEM service is available, and the buyer supplies the drawing and requirements. Payment can be made through Paypal, Western Union, Money Gram or T/T transfer. Most orders without stock take 10 to 14 business days. If stock is on hand, 2 to 3 business days.

Production Process

Every SD5 valve moves through the same seven-stage flow before it leaves the factory.

Raw Material Inspection. Incoming material is checked before it enters production. This is the first control point.

Precision Machining. The valve body, spool and bore are machined. The spool and bore are handled as a matched pair, because their fit determines how the valve seals when centered.

Heat Treatment. Machined parts go through heat treatment before surface work begins.

Surface Treatment. The valve body is phosphating treated. This step gives the surface its corrosion resistance.

Assembly. The valve is assembled into its monoblock body. Sections are built according to the ordered configuration, from 1 to 12 sections.

Pressure Testing. The assembled valve is tested under pressure before it moves to final inspection.

Final Inspection. The finished valve goes through final inspection before packing. At least 10 inspection procedures are carried out before each batch is shipped.

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