Piston assembly is the important spare parts and expendable parts of oil drilling mud pumps.

It’s composed of Snap spring, retainer, piston cup and piston hub.

We offer a full line of pistons assembly for duplex and triplex mud pumps. All types are fully interchangeable with API standard designed pistons and deliver maximum performance in almost all drilling conditions.

Piston size is available from 4” to 7-1/2”.

There are two types of pistons:

1.Bonded pistons: Vulcanizing piston cup on piston hub directly, and don’t need press plate and snap spring to fix.

2.Replaceable pistons: can remove the piston cup, and the pistons are fixed by press plate and snap ring.

Someone also distinguish the pistons by single action piston and double action piston. The double action piston is often used in Russian pumps.

Material of piston hub: forged by 45# steel or 40Cr with hardening and tempering

Material of piston cup: urethane(China made and USA imported)

                                        NBR rubber (China made)

Surface treatment of piston hub: by phosphating and by Oxidizing

Bonded Piston

super premium piston:

Someone also calls supreme piston; high temperature resistance piston.

one piece bonded constructed piston, no joints, no leakage.

Material of piston cup: imported USA urethane material

Service life: ≥700 hours

Suitable for zirconial ceramic liner and high pressure mud pump

Good performance under extreme drilling conditions

bonded urethane piston:

Someone also calls piston assembly with PU cup, bonded piston with polyurethane

cup, bonded piston with urethane, and urethane bonded piston.

one piece bonded constructed piston, no joints, no leakage.

Service life: ≥200 hours and ≥500 hours

Material of piston cup:   ≥200 hours, China made urethane material

                                         ≥500 hours,   imported USA urethane material

This type is the most commonly used one.

bonded rubber piston:

Someone also calls rubber bonded piston, bonded piston with rubber

one piece bonded constructed piston

Material of piston rubber: NBR

Replaceable Piston

replaceable urethane pistons:

Also named piston with replaceable urethane

It’s composed of Snap spring, retainer, piston cup and piston hub.

Piston cup can be removed

Material of piston cup: urethane

replaceable rubber pistons:

Also named piston with replaceable rubber

It’s composed of Snap spring, retainer, piston cup and piston hub.

Piston cup can be removed

Material of piston cup: NBR

We can provide spare parts for the following series of drilling mud pump: