S-Valve / Rock Valve for Concrete Pumps – Specifications & Verification

Product Specifications

Technical details and manufacturing context for S-Valve or Rock Valve

Definition

The S-Valve or Rock Valve is a critical directional control component used in concrete pump units. Its primary function is to alternate the flow of concrete from the pumping cylinders to the delivery pipeline, ensuring a continuous and efficient pumping process. The valve operates through a rocking or swinging motion, which is why it is also referred to as a Rock Valve. In one position, it connects the first pumping cylinder to the delivery pipeline while the second cylinder refills; it then rocks to the opposite position, connecting the second cylinder to the pipeline while the first refills. This alternating action prevents backflow and maintains a steady flow of concrete, which is essential for the performance of the pump.

The valve is typically manufactured from high-chrome cast iron, hardened steel, or wear-resistant alloys to withstand the abrasive nature of concrete. Key parameters include a nominal diameter of 125–150 mm, operating pressure of 1.0–1.6 MPa, and a maximum flow rate of 60–120 m³/h. The sealing surface hardness is specified at 55–62 HRC, and the operating temperature range is -20 to 80 °C. The weight varies between 80 and 150 kg depending on size and material. The body is made of cast steel (ZG270-500) per GB/T 11352, and the seal material is polyurethane (PU) for abrasion resistance. Surface treatment includes hard chrome for corrosion and wear resistance. The leakage rate is ≤0.1 mL/min at rated pressure, and the switching time is 0.5–1.5 seconds. The mounting type is flanged per ISO 7005.

These values are reference ranges and must be verified for the specific model and application. Standards such as ISO 6508 are mentioned as procurement references, but they do not imply certification or compliance of any particular product. Always confirm model-specific specifications and standards with the legal manufacturer or supplier before purchase or installation.

Working Principle

The S-Valve operates via a rocking motion that alternates between two positions. In the first position, the valve connects the first pumping cylinder to the delivery pipeline, allowing concrete to be pushed out, while the second cylinder refills. After the first cylinder completes its stroke, the valve rocks to the second position, connecting the second cylinder to the pipeline and allowing the first to refill. This alternating action ensures continuous concrete flow, prevents backflow, and maintains pumping efficiency. The valve's design minimizes wear and ensures reliable operation under high pressure and abrasive conditions.

Common Materials

High-chrome cast iron, Hardened steel, Wear-resistant alloys

Technical Parameters

Parameter	Typical range	Notes & selection driver
Nominal Diameter	125–150 mm	Matches pipeline size
Max Flow Rate	60–120 m³/h	Depends on pump capacity
Sealing Surface Hardness	55–62 HRC	Wear resistanceISO 6508
Operating Temperature	-20–80 °C	Concrete temperature range
Weight	80–150 kg	Depends on size and material
Material	ZG270-500	Cast steel bodyGB/T 11352
Seal Material	PU	Polyurethane for abrasion
Surface Treatment	Hard chrome	Corrosion and wear resistance
Leakage Rate	≤0.1 mL/min	At rated pressureISO 5208
Switching Time	0.5–1.5 s	Affects pumping cycle
Mounting Type	Flanged	Standard pipe connectionISO 7005

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Valve Body
Main structural housing that contains the valve mechanism

Material: High-chrome cast iron
Switching Mechanism
Hydraulic or mechanical system that rocks/swings the valve between positions

Material: Hardened steel
Wear Plates Part
Replaceable surfaces that withstand abrasive concrete flow

Material: Wear-resistant alloy
Seals Part
Prevent concrete leakage between valve components

Material: Polyurethane or rubber

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for S-Valve or Rock Valve.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Concrete Pump Unit

View system integration details

Manufacturers of S-Valve or Rock Valve

Manufacturer profiles associated with S-Valve or Rock Valve.

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Frequently Asked Questions

What is the primary function of an S-Valve in a concrete pump?

The S-Valve alternates the flow of concrete between two pumping cylinders and the delivery pipeline, ensuring continuous flow and preventing backflow.

What materials are commonly used for S-Valves?

Common materials include high-chrome cast iron, hardened steel, and wear-resistant alloys. The body is often cast steel (ZG270-500) and seals are polyurethane.

What are typical operating parameters for an S-Valve?

Typical reference ranges include nominal diameter 125–150 mm, operating pressure 1.0–1.6 MPa, flow rate 60–120 m³/h, and temperature -20 to 80 °C. These must be confirmed for the specific model.

How should I verify the suitability of an S-Valve for my application?

Check the valve's nominal diameter, pressure rating, flow capacity, and connection type against your pump's specifications. Always consult the manufacturer or supplier for model-specific data and compliance with relevant standards.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 150 bar
flow rate:	Up to 180 m³/h
temperature:	-10°C to 80°C
slurry concentration:	Up to 70% solids by volume

S-Valve or Rock Valve

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards