S Series | Thermodynamic Disc Steam Traps
Steam Traps S Series | Thermodynamic Disc Steam Traps
S31N
Models that handle steam locking also available
Features/Applications
Features
Compact and cost effective design
It has a space saving, simple mechanism with very few moving components.
Easy maintenance
The minimum of moving parts and an easy in-line access ensures easy and fast maintenance.
Special design against steam locking
To avoid cases of steam locking, Miyawaki offers special models to handle steam locking.
(S31N-G/S31NF-G, S31N-2/S31NF-2)Flexible installation
This product can be installed either horizontally or vertically.
Auto blow off and air vent
Thanks to a bimetal ring, the trap smoothly discharges initial air and cold condensate. (Auto blow-off mechanism)
Typical applications
Suitable for steam main lines, small steam equipment, and other such applications.
Dimensions/Weight
Dimensions/Weight
Screwed
½”・¾”・1”
1 ¼”・1 ½”・2”
| Size | Dimensions (mm) | Dimensions (in) | Weight | |||||||
| L | H1 | H2 | W | L | H1 | H2 | W | (kg) | (lb) | |
| ½” | 90 | 55 | 65 | 60 | 3.5 | 2.2 | 2.6 | 2.4 | 1,1 | 2.4 |
| ¾” | 60 | 2.4 | 1,2 | 2.6 | ||||||
| 1” | 95 | 3.7 | 1,3 | 2.9 | ||||||
| 1 ¼” | 180 | 104 | 100 | 106 | 7.1 | 4.1 | 3.9 | 4.2 | 8,0 | 17.6 |
| 1 ½” | 8,7 | 19.2 | ||||||||
| 2” | 111 | 4.4 | 9,3 | 20.5 | ||||||
Flanged
½”・¾”・1”
1 ¼”・1 ½”・2”
| Size | Dimensions (mm) | Dimensions (in) | Weight | |||||||
| L | H1 | H2 | W | L | H1 | H2 | W | (kg) | (lb) | |
| ½” | 140 | 55 | 65 | 60 | 5.5 | 2.2 | 2.6 | 2.4 | 2,5 | 5.5 |
| ¾” | 150 | 60 | 5.9 | 2.4 | 3,0 | 6.6 | ||||
| 1” | 160 | 6.3 | 4,2 | 9.2 | ||||||
| 1 ¼” | 240 | 104 | 100 | 106 | 9.5 | 4.1 | 3.9 | 4.2 | 12,0 | 26.4 |
| 1 ½” | 13,5 | 29.8 | ||||||||
| 2” | 14,5 | 32.0 | ||||||||
Specifications
| Model | Connection |
Max. operating pressure |
Max. operating pressure differential |
Max. operating temperature |
Body material |
||||
| Type | Size |
PMO (MPa) |
PMO (psig) |
⊿PMX (MPa) |
⊿PMX (psig) |
TMO (℃) |
TMO (℉) |
||
| S31N |
Screwed Rc,NPT |
½” | 1,6 | 230 | 1,6 | 230 | 220 | 428 |
Ductile cast iron FCD450 |
| ¾” | |||||||||
| 1” | |||||||||
| 1 ¼” |
Cast iron FC250 |
||||||||
| 1 ½” | |||||||||
| 2” | |||||||||
| S31NF |
Flanged FF,RF* |
½” |
Ductile cast iron FCD450 |
||||||
| ¾” | |||||||||
| 1” | |||||||||
| 1 ¼” |
Cast iron FC250 |
||||||||
| 1 ½” | |||||||||
| 2” | |||||||||
*Available flange standards: ASME/JPI 150lb, 300lb, DIN PN16, JIS 10K, 16K, 20K. ASME/JPI 300lb not available for size 2”.
●Maximum allowable pressure (PMA): 1,6MPa (230psig) PMA is the pressure that can be tolerated by pressure-resistant parts (body).
●Maximum allowable temperature (TMA): 220℃ (428℉) TMA is the temperature that can be tolerated by pressure-resistant parts (body).
●Min. operating pressure differential (⊿PMN): 0,03MPa (4.4psig) ⊿PMN is the minimum operating pressure differential between the trap inlet and outlet.
*Special design models against steam locking are available.
| Model | S31N-G | (Screwed) |
| S31NF-G | (Flanged) | |
| S31N-2 | (Screwed) | |
| S31NF-2 | (Flanged) |
Discharge Capacity
Download
* Membership registration is required to download the documents.
Features
Compact and cost effective design
It has a space saving, simple mechanism with very few moving components.
Easy maintenance
The minimum of moving parts and an easy in-line access ensures easy and fast maintenance.
Special design against steam locking
To avoid cases of steam locking, Miyawaki offers special models to handle steam locking.
(S31N-G/S31NF-G, S31N-2/S31NF-2)Flexible installation
This product can be installed either horizontally or vertically.
Auto blow off and air vent
Thanks to a bimetal ring, the trap smoothly discharges initial air and cold condensate. (Auto blow-off mechanism)
Typical applications
Suitable for steam main lines, small steam equipment, and other such applications.
Dimensions/Weight
Screwed
½”・¾”・1”
1 ¼”・1 ½”・2”
| Size | Dimensions (mm) | Dimensions (in) | Weight | |||||||
| L | H1 | H2 | W | L | H1 | H2 | W | (kg) | (lb) | |
| ½” | 90 | 55 | 65 | 60 | 3.5 | 2.2 | 2.6 | 2.4 | 1,1 | 2.4 |
| ¾” | 60 | 2.4 | 1,2 | 2.6 | ||||||
| 1” | 95 | 3.7 | 1,3 | 2.9 | ||||||
| 1 ¼” | 180 | 104 | 100 | 106 | 7.1 | 4.1 | 3.9 | 4.2 | 8,0 | 17.6 |
| 1 ½” | 8,7 | 19.2 | ||||||||
| 2” | 111 | 4.4 | 9,3 | 20.5 | ||||||
Flanged
½”・¾”・1”
1 ¼”・1 ½”・2”
| Size | Dimensions (mm) | Dimensions (in) | Weight | |||||||
| L | H1 | H2 | W | L | H1 | H2 | W | (kg) | (lb) | |
| ½” | 140 | 55 | 65 | 60 | 5.5 | 2.2 | 2.6 | 2.4 | 2,5 | 5.5 |
| ¾” | 150 | 60 | 5.9 | 2.4 | 3,0 | 6.6 | ||||
| 1” | 160 | 6.3 | 4,2 | 9.2 | ||||||
| 1 ¼” | 240 | 104 | 100 | 106 | 9.5 | 4.1 | 3.9 | 4.2 | 12,0 | 26.4 |
| 1 ½” | 13,5 | 29.8 | ||||||||
| 2” | 14,5 | 32.0 | ||||||||
| Model | Connection |
Max. operating pressure |
Max. operating pressure differential |
Max. operating temperature |
Body material |
||||
| Type | Size |
PMO (MPa) |
PMO (psig) |
⊿PMX (MPa) |
⊿PMX (psig) |
TMO (℃) |
TMO (℉) |
||
| S31N |
Screwed Rc,NPT |
½” | 1,6 | 230 | 1,6 | 230 | 220 | 428 |
Ductile cast iron FCD450 |
| ¾” | |||||||||
| 1” | |||||||||
| 1 ¼” |
Cast iron FC250 |
||||||||
| 1 ½” | |||||||||
| 2” | |||||||||
| S31NF |
Flanged FF,RF* |
½” |
Ductile cast iron FCD450 |
||||||
| ¾” | |||||||||
| 1” | |||||||||
| 1 ¼” |
Cast iron FC250 |
||||||||
| 1 ½” | |||||||||
| 2” | |||||||||
*Available flange standards: ASME/JPI 150lb, 300lb, DIN PN16, JIS 10K, 16K, 20K. ASME/JPI 300lb not available for size 2”.
●Maximum allowable pressure (PMA): 1,6MPa (230psig) PMA is the pressure that can be tolerated by pressure-resistant parts (body).
●Maximum allowable temperature (TMA): 220℃ (428℉) TMA is the temperature that can be tolerated by pressure-resistant parts (body).
●Min. operating pressure differential (⊿PMN): 0,03MPa (4.4psig) ⊿PMN is the minimum operating pressure differential between the trap inlet and outlet.
*Special design models against steam locking are available.
| Model | S31N-G | (Screwed) |
| S31NF-G | (Flanged) | |
| S31N-2 | (Screwed) | |
| S31NF-2 | (Flanged) |
* Membership registration is required to download the documents.