Flojet 20028-033 Valve Chamber Kit, EPDM Fabric, Nylon
The Flojet 20028-033 is the genuine valve chamber kit carried under the factory designation "Kit V/Chmbr Ep Fab Ny" — an EPDM fabric-reinforced specification with nylon components.
Fabric reinforcement is the detail that sets this version apart. A plain elastomer flap relies entirely on the rubber itself for strength, and under repeated pressure cycling it can stretch, distort or eventually tear at the hinge. Bonding a fabric layer into the elastomer gives it a backbone: it holds its shape under load, resists stretching across the face, and carries the flexing at the hinge far better over time. That matters most in pumps that run at higher pressures or long duty cycles, where a plain flap would fatigue.
The EPDM compound brings its usual strengths — hot water, steam, alkalis, caustics and dilute acids — along with its one significant limitation, which is that it swells in petroleum products. The nylon components provide rigid, dimensionally stable structure where the assembly needs stiffness rather than flexibility. Check the part number against your pump’s parts breakdown before ordering, and renew or clean the suction strainer if the old valves show cuts or embedded grit.
Key Features
- Genuine Flojet (Xylem) service part — complete valve chamber kit
- Fabric-reinforced EPDM — resists stretching, distortion and hinge fatigue under pressure cycling
- Nylon components for rigid, dimensionally stable structure
- EPDM chemistry: hot water, steam, alkalis, caustics and dilute acids
- Factory designation: Kit V/Chmbr Ep Fab Ny
Applications
- Flojet diaphragm pumps running at higher pressure or long duty cycles
- Hot water, caustic and dilute acid service
- Rebuilding a pump where plain valves have stretched or torn
- Applications demanding longer valve life than a plain elastomer gives
- Marine, RV, dockside and industrial water systems
Specifications
- Brand: Flojet (Xylem)
- Manufacturer Part Number: 20028-033
- Part Type: Valve chamber kit
- Valve Material: Fabric-reinforced EPDM
- Other Components: Nylon
- Factory Designation: Kit V/Chmbr Ep Fab Ny
- Not Suitable For: Petroleum oils, diesel and petrol
- Condition: New
Frequently Asked Questions
Q: What does fabric reinforcement change in practice?
It stops the elastomer stretching across its face and tearing at the hinge, which is the usual end-of-life failure for a plain flap in a hard-working pump.
Q: Is a reinforced valve stiffer to open?
Slightly, which is why it is specified for particular pumps rather than fitted universally. Use the kit listed for your model rather than choosing by material preference.
Q: Why nylon rather than more elastomer?
Because parts of the assembly need to hold their shape rather than flex. Nylon gives rigidity and dimensional stability where an elastomer would deform under clamping load.
Q: Do reinforced valves last longer?
In the duties they are designed for, yes. In gentle low-pressure service the difference is far less noticeable, which is why both specifications exist.
Not sure this is the right part? Send us a Picture of the pump plate on your pump and the CLR Marine team will confirm the correct part before you order.
CLRMarine
