S-valve, cylinder and piston regeneration in concrete pumps

Name: PHS Magnum
Address: ul. Kościelna 9, Chorula, Opolskie, 47-316, PL
Telephone: +48 602 716 551
Price range: $$

S-valve and concrete cylinder regeneration: hardfacing HRC 58-62, grinding to nominal diameter, lapping. Hydraulic and EN 1090 boom repairs. PHS Magnum, Poland.

S-valve and concrete cylinder regeneration – PHS Magnum Chorula

We regenerate S-valves, concrete cylinders and rubber pistons in concrete pumps: hardfacing of cutting edges and working surfaces, grinding back to nominal diameter, lapping of sealing faces. The same process covers hydraulic repairs, EN 1090 certified boom welding with NDT inspection and Carbotech section replacement. Workshop in Chorula near Opole, Poland; mobile service 7 days a week.

Regeneration is work to tenths of a millimetre: the weld deposit needs the right hardness, the wall has to keep sufficient thickness after machining, and the S-valve sealing clearance after lapping must stay below 0.02 mm. That is why the equipment — machine tools, welding station, NDT control — decides the result, not simply fitting new parts.

Concrete circuit regeneration (cylinders, pistons, S-valve)

Rubber pistons – most wearable component. Wear depends on concrete abrasiveness, working pressure and water buffer maintenance. Symptom: cement slurry visible in water chamber after pumping.

Concrete cylinders – hardened steel tubes. Regeneration: hardfacing with HRC 58-62 steel, then grinding to nominal diameter.

S-valve – the beating heart of the pump. Regeneration: hardfacing cutting edges with HRC 60 electrode, grinding to nominal geometry, lapping sealing surfaces to <0.02 mm clearance.

Hydraulic system repairs

Main hydraulic circuit (driving concrete pumping) and boom circuit (operating cylinders):

Hydraulic cylinder seal replacement
Hydraulic cylinder regeneration
Main hydraulic pump replacement or regeneration
Electro-hydraulic valve replacement

Boom repairs

Boom is a welded structure of high-strength steel (HB360-HB500) subject to NDT testing every 2 years.

Most common repairs:

Pin and bearing surface hardfacing
Bearing replacement
Weld crack repair – certified welder (EN 1090) only, with NDT check and TDT before resuming operation

Electronic diagnostics

Modern pumps have CAN-bus diagnostic systems. We have specialist testers for:

Putzmeister Ergonic – error codes, sensor calibration
Cifa Smartronic – diagnostics and parameter programming
Schwing Eco – monitoring system diagnostics

For Putzmeister pistons, S-valves, cylinders, oils and OEM maintenance kits stocked in Chorula, see Putzmeister spare parts — pistons, cylinders, S-valve, OEM & alternatives .

Frequently Asked Questions

First symptoms: increased noise during operation, cylinder vibrations, irregular S-valve banging, hydraulic oil in concrete (or cement slurry in oil). Measure clearance with calipers – replacement needed when clearance exceeds 0.5-0.8 mm depending on model.

Regeneration (hardfacing and grinding to nominal diameter) is significantly cheaper than replacing the cylinder with a new original one. Economic justification depends on remaining wall thickness – if too thin after hardfacing, the weld deposit will not hold and only a new cylinder makes sense. Our specialists assess regeneration feasibility after measurement and prepare a quotation.

No. Cracks in the boom's load-bearing structure require workshop repair by a certified welder (EN 1090), followed by NDT inspection and TDT approval before resuming operation. On-site repair without certification is illegal and extremely dangerous.

Contact & Hours

ul. Kościelna 9, 47-316 Chorula

Mon–Fri 06:00–20:00

Sat 07:00–15:00

+48 602 716 551 Contact Form

ISO 9001:2015

4 km from motorway A4

180 km from German border