Product Overview

The Spirax Sarco TD42S2 thermodynamic steam trap is a high-efficiency drainage device specifically designed for steam systems, manufactured with a forged steel body, featuring excellent pressure and temperature resistance. The product provides standard and low discharge LC models, with all LC model port sizes featuring low discharge design, specifically adapted for steam main and tracing line drainage requirements.

This product strictly complies with the European Pressure Equipment Directive 97/23/EC, and can provide EN 10204 3.1 standard test certificates according to customer requirements (must be specified when ordering). The product is certified by UKAS (Cert No. LRQ 0963008) and ISO 9001, with stable and reliable quality, suitable for long-term operation under complex industrial conditions.

Note: When used for extended periods at temperatures above 425℃, the carbon phase compounds in steel may convert to graphite. Use at this temperature is permitted but long-term application is not recommended.

Port Sizes and Pipe Connections

The product provides multiple port size options, all using socket weld connections, compliant with ANSI B16.11 Sch 80/BS3799 Class 3000 Ib standards. Specific port sizes include:

• Standard Model: ½", ¾", 1"
• Low Discharge Model (LC): ½"LC, ¾"LC, 1"LC

Optional Accessories

• Thermal Insulation Cover: Made of aluminum, effectively reduces excessive heat loss from the steam trap due to exposure to low temperature environments or weather, preventing excessive cycling and ensuring operational stability.
• Integrated Blowdown Valve: The filter cover can be drilled and tapped with 3/8" BSP or NPT threads for installing a blowdown valve (recommended models BDV1 or BDV2), facilitating blowdown maintenance.

Component Material Details

No.	Component Name	Material Specification	Additional Standard
1	Body	Steel	ASTM A105N
2	Cap	Stainless Steel	AISI 416
3	Disc	Stainless Steel	BS 1449 420 S45
4	Filter	Stainless Steel	AISI 316L
5	Filter Cover	Carbon Steel	ASTM A105N
6	Filter Cover Gasket	Stainless Steel	BS 1449 304 S16
7	Thermal Insulation Cover (Optional)	Aluminum	-

Note: Specific specifications for Part 7 (Thermal Insulation Cover) can be found in the spare parts diagram provided with the product.

Dimensions and Weight (Approximate)

Unit: Dimensions in mm, Weight in kg

Port Size	A	B	C	D	E	F	G	H	Weight
½"	41	76	46	71	20	57	57	38	0.80
½"LC	40	76	46	71	20	57	57	38	0.75
¾"	47	78	47	72	20	63	57	38	1.00
¾"LC	44	78	47	72	20	57	57	38	1.00
1"	53	92	52	77	25	63	70	38	1.50
1"LC	48	92	52	77	20	60	57	38	1.50

Recommended Tightening Torque

Applicable Specification	Specification Marking	Tightening Torque (Nm)
½"LC	36 A/F	87-97
¾"LC	36 A/F	87-97
1"LC	36 A/F	87-97
½"	41 A/F	100-110
¾"	41 A/F	100-110
1"	55 A/F	140-160
All Port Sizes (Part 5)	27 A/F M24	120-135

Installation and Maintenance Instructions

Installation Requirements

1. It is recommended to install the TD42S2 steam trap horizontally, with a descending pipe section upstream of the valve to ensure drainage efficiency.
2. The product can also be installed and operated in other orientations according to actual operating requirements.
3. For detailed safety information, installation steps, and maintenance procedures, please refer to the Installation and Maintenance Guide (No.: IM-P068-37) provided with the product.

Discharge Characteristics

Product discharge is closely related to condensate quantity and pressure differential. Discharge curves for different specifications and models can be found in the discharge charts in technical documentation (condensate quantity unit: kg/h, pressure differential unit: bar, ×100=kPa). When selecting, choose the correct model according to actual operating conditions to ensure normal operation and extend service life. For steam main and tracing line drainage, regardless of pipe diameter, LC (Low Discharge) type steam traps are recommended.

Product Disposal and Environmental

This product is recyclable, and when disposed of according to standard requirements, will not cause harm to the ecological environment, meeting environmental sustainability requirements.

Certificates and Ordering Instructions

Certificate Application

The product can provide EN 10204 3.1 standard certificates, which must be clearly specified when ordering.

Ordering Example

1-½" Spirax Sarco TD42S2LC thermodynamic steam trap, socket weld connection, with thermal insulation cover.

Spare Parts Information

Available Spare Parts	Corresponding Part No.
Disc (3 pieces/set)	3
Filter and Gasket	4, 6
Filter Cover Gasket (3 pieces/set)	6
Thermal Insulation Cover	7

For details on spare parts, please refer to the spare parts diagram provided with the product. Core spare parts (such as disc, filter, gasket, etc.) can be ordered by contacting the manufacturer. When ordering, specify the product model, port size, and required spare part name.