Process Technologyof Pennsylvania, Inc.
Series 50

Renew Bellows Traps

A bellows steam trap built for piping systems where in-line renewability is essential: replace the sealed trap capsule in five minutes, with no pipe unions needed.

Max pressure
300 psi (21 bar)
Max temperature
425 °F (218 °C)
Body rating
ANSI Class 300
Sizes
3⁄8" – 3⁄4" NPT
Request a quote Dimensions & weights
PT Series 50 renewable bellows steam trap

Applications

  • “A” orifice: process and heating applications
  • “B” orifice: drip and tracing applications

Best suited for piping systems where in-line renewability is essential.

Operating principle

A welded stainless steel bellows senses the trap inlet pressure and temperature and controls the condensate discharge of the trap. The trap discharges condensate and follows the saturating steam curve closely within 10 °F (6 °C).

Design features

  • 5-minute in-line renewability
  • No need for pipe unions
  • Excellent thermal efficiency
  • Fail-open
  • Resistance to corrosion and hydraulic shocks
  • Self-draining and freeze-proof
  • Venting of air and non-condensable gases
  • Excellent back pressure capability
  • Fast response to temperature change
  • Close following of saturation line
  • Compact and light weight; easy installation
  • All stainless steel trap
  • 3-year warranty on trap capsule; 10-year warranty on other trap parts

Capacities and seat orifices

Capacity chart: trap flow rate versus inlet pressure for seat orifices A and B
Capacities measured at near steam temperature.

Parts and materials

Cross-section drawing of the Series 50 trap with numbered parts
ItemPartMaterial
1End fittingStainless steel
2*SealsTFE, graphite
3*Body housingStainless steel
4*Name plateAluminum
5*Body plateStainless steel
6BoltsStainless steel
7*Mounting plateStainless steel
8*BellowsStainless steel
9Nut washerStainless steel
10NutsStainless steel

* Completely seal-welded trap capsule parts and seals included in the repair kit.

Repair kit: specify 50-A-RK or 50-B-RK. Each kit contains one completely tested trap capsule and two seal O-rings.

Dimensions and weights

End connectionin (DN)“W” Øin (mm)“L”in (mm)Weightlb (kg)
3⁄8 (10)2 1⁄2 (64)2 3⁄4 (70)1.04 (0.47)
1⁄2 (15)2 1⁄2 (64)2 3⁄4 (70)1.08 (0.49)
3⁄4 (20)2 1⁄2 (64)2 3⁄4 (70)1.14 (0.52)

Installation

Install trap horizontally or vertically downward with a strainer at the trap inlet.