Product Overview

Spirax Sarco TD42L and TD42H series are repairable thermodynamic steam traps designed for different drainage requirements: TD42L has relatively lower rated condensate discharge capacity, primarily for main line drainage applications; TD42H is suitable for process load drainage. When air venting is required in the application, derivative models TD42LA (corresponding to TD42L) and TD42HA (corresponding to TD42H) equipped with anti-airlock discs can be selected.

The outer surface of the valve body in this series is treated with ENP nickel plating, providing both energy-saving and oxidation-resistant advantages, suitable for long-term use under complex operating conditions. The products comply with ISO 6552 standard limitations, certified by UKAS (Cert No. LRQ 0963008) and ISO 9001, ensuring reliable quality.

Key Technical Parameters

Temperature and Pressure Parameters

Parameter Type	Specific Value
Maximum Allowable Temperature (TD42L&TD42H)	400℃@42 bar g
Maximum Allowable Temperature (TD42LA&TD42HA)	255℃@42 bar g
Minimum Allowable Temperature	0℃
Maximum Operating Pressure (PMO)	42 bar g
Maximum Allowable Pressure (PMA)	63 bar g@100℃
Maximum Allowable Temperature (TMA)	400℃@42 bar g
Maximum Working Back Pressure	80% of upstream pressure (valve cannot close if exceeded)
Minimum Inlet Pressure for Normal Operation	0.25 bar, 0.80 bar
Design Maximum Cold Water Test Pressure	95 bar g

Port Sizes and Pipe Connections

The product provides multiple port size options, covering 3/8", ½", ¾", 1" specifications, adaptable to different pipeline system requirements. Specific dimensions and weights are detailed in the "Dimensions and Weight" section below.

Optional Accessories

• Thermal Insulation Cover: Made of aluminum, prevents excessive heat loss from the steam trap due to exposure to low temperature environments or weather, thereby preventing excessive cycling.
• Integrated Blowdown Valve: The filter cover can be drilled and tapped with 3/8" BSP or NPT threads for connecting a blowdown valve (such as BDV1 or BDV2).

Material Details

No.	Component Name	Material Specification	Additional Standard
1	Body	Stainless Steel (ENP surface treatment)	ASTM A743 Gr.CA 40 F
2	Cap	Stainless Steel	AISI 416
3	Disc	Stainless Steel	BS 1449 420 S45
4	Filter	Stainless Steel	BS 1449 304 S16
5	Filter Cover	Stainless Steel	AISI 416
6	Filter Cover Gasket	Stainless Steel	BS 1449 304 S16
7	Thermal Insulation Cover (Optional)	Aluminum	-

Dimensions and Weight (Approximate)

Unit: Dimensions in mm, Weight in kg

Port Size	A	B	E	G	H	J	K	L	Weight
3/8"L	41	78	55	85	20	52	57	38	0.80
½"L	41	78	55	85	20	52	57	38	0.75
¾"L	44	85	60	100	20	52	57	38	0.95
1"L	48	95	65	100	20	58	57	38	1.50
½"H	41	78	55	85	41	57	57	38	0.80
¾"H	47	90	60	100	41	63	57	38	1.00
1"H	53	96	66	100	41	-	-	-	1.50

Recommended Tightening Torque

Part No.	Applicable Model and Port Size	Specification (mm)	Tightening Torque (Nm)
2	TD42L - All Port Sizes	36	135-150
2	TD42H - ½", ¾"	41	180-200
2	TD42H - 1"	55	250-275
5	-	M28 (32)	170-190

Installation and Maintenance Instructions

Installation Requirements

The steam trap is recommended to be installed on a horizontal pipe, with a short descending pipe section upstream to ensure optimal operating performance.

Safety and Operation

For detailed safety information, installation steps, and maintenance procedures, please refer to the Installation and Maintenance Guide (No.: IM-068-024) provided with the product.

Discharge Characteristics

Product discharge is related to condensate quantity and pressure differential, adaptable to drainage requirements under different operating conditions. Specific discharge curves refer to the discharge charts in technical documentation (condensate quantity unit: kg/h, pressure differential unit: bar, ×100=kPa).

Certificates and Spare Parts

Certificate Provision

This product can provide standard test certificates, which must be clearly specified when ordering.

Available Spare Parts

Spare Part Name	Applicable Model	Corresponding Part No.
Disc (3 pieces/set)	TD42L or TD42H	3
Disc and Filter	TD42LA or TD42HA	3, 4, 6
Filter and Gasket	TD42L or TD42H	4, 6
Thermal Insulation Cover	-	7
Filter Cover Gasket (3 pieces/set)	-	6

Spare Parts Ordering Instructions

When ordering spare parts, specify the steam trap port size and specific model. Example: 1-Filter and Gasket for ½" TD42L thermodynamic steam trap.

Product Disposal and Environmental

This product is recyclable, and when properly disposed of, will not cause negative impacts on the ecological environment.

Ordering Instructions

When ordering, clearly specify the product model, port size, and connection type. Example: 1-Spirax Sarco ½" TD42L thermodynamic steam trap, BSP threaded connection.