BURKERT Type 2973 (Article No. 20111668) is a manually operated 2/2-way diaphragm valve designed for hygienic, sterile, and aggressive process environments. This specific configuration features a DN 15 (21.3 x 1.6 mm) welded connection conforming to DIN EN ISO 1127 / ISO 4200 / DIN 11866 Series B. The flow-optimized valve body is constructed from forged stainless steel 316L/1.4435 BN2 with minimal dead space, enabling high flow values (Kv value 6 m³/h). It utilizes a high-performance PTFE diaphragm with an EPDM backing membrane, supporting medium temperatures from -10 °C to +130 °C and operating pressures up to 10 bar. The manual actuator features a 45 mm PPS handwheel and a visual position indicator, offering a compact and autoclavable design.

The valve is fully CIP and SIP capable, making it ideal for food, beverage, biotechnology, and pharmaceutical applications. It complies with FDA and USP Class VI standards for food and pharmaceutical contact. Additionally, this model carries ATEX and IECEx certifications for use in potentially explosive atmospheres (Zone 1/21 and Zone 2/22).

Approvals and Conformities

• Explosion Protection: ATEX II 2G Ex h IIC T4...T2 Gb / II 2D Ex h IIIC T135°C...T300°C Db; IECEx Ex h IIC T4...T2 Gb / Ex h IIIC T135°C...T300°C Db.
• Food and Pharma: FDA compliant, USP Class VI compliant, and suitable for use with food and beverages according to EC Regulation 1935/2004.
• Certifications: Includes Manufacturer's test certificate 3.1 and Factory certification 2.1 for the membrane.

Safety Instructions

Risk of injury due to high pressure and escaping medium: Switch off the pressure before working on the device or system. Vent or empty the lines. Explosion Hazard: Ensure proper grounding of the valve body and actuator to prevent electrostatic charging in Ex areas. Only clean with a damp or antistatic cloth.

Material Specifications

No.	Element	Material
1	Lock pin	Stainless steel 1.4305
2	Screw	Stainless steel A2
3	Handwheel cover	Polyamide (PA)
4	Handwheel	Polyphenylene sulphide (PPS)
5	Visual position indicator	Polyamide (PA)
6	Valve spindle	Stainless steel 1.4305
7	Diaphragm socket	Stainless steel 1.4308
8	Diaphragm	PTFE with EPDM backing membrane
9	Valve body	Forged stainless steel 316L/1.4435 BN2

Dimensions

Manual Actuator (Diaphragm Size 15)

Diaphragm size	H1	H2	H3	H4	∅ B
15	127	133	121	127	45

(Dimensions in mm)

Forged Steel Valve Body (VS) with Welded Connection

Diaphragm size	Port connection DN	∅D1	s	L	h	H	Product key
15	15	21.3	1.6	110	12.05	23.75	SA42

(Dimensions in mm. Standard: DIN EN ISO 1127 / ISO 4200 / DIN 11866 series B)

Performance Specifications

• Kv Value (Water): 6.5 m³/h (Measured at +20 °C, 4 bar at valve inlet and 3 bar at valve outlet for DN 15 forged body).
• Maximum Static Operating Pressure: 10 bar.
• Tightening Torque (PTFE Diaphragm): 1.7 Nm (Static), 2.5 Nm (Dynamic).

Installation Note

For self-draining operation, the valve must be installed at the correct drainage angle. The marking on the port connection of the valve body serves as an orientation aid and must point upwards.