Introduction

The 3pc Ball Valve is a ball valve structure consisting of segmented valve body sections with a centrally located ball, used for applications requiring detachable valves to cut off and maintain media in industrial pipelines.

Specification

Item	Specification / Description
Model	P30C or OEM
Construction	3 pc screwed / split body
Size	1/4" – 4" (DN6–DN100)
Rating	PN16–40 / 1000 WOG / 1000 psi (also 2000 WOG PN63 for high pressure models)
Working Temperature	-196℃ to +400℃ (-4℉ to 500℉)
Design Standard	ANSI B16.34 / ASME VIII Div.1 / EN 12516-1
Face to Face	ASME B16.1
Stem Design	Anti Blow-Out, Blow-Out Proof
Mounting Pad	ISO 5211 (for actuator)
Tightness Class	API 598 Cl.A / ASME B16.104 / FCI 70-2 Cl.VI / GOST 54808 Cl.A / EN 12266-1 / ISO 5208
Connection Types	GAS / NPT / DBSP / DIN / Socket Weld / Butt Weld
Seats	Soft or metal seated
Materials (Parts)	Ball: ASTM A276-304/316; Stem: ASTM A276-304/316; Cap: ASTM A351-CF8/CF8M; Body: ASTM A351-CF8/CF8 / ASTM A216-WCB; Thrust Washer: RTFE/CTFE; Gland Ring: AISI 304; Others: Stainless Steel, PVC, Viton O-Rings

product-952-841

Features

Zero-Leakage Seal

The seal meets API 598 Class A and ISO 5208 Class A standards, with RTFE/CTFE seats and balls achieving micron-level fit.

Extreme Temperature Adaptability

Operating range -196℃ to +400℃, 316 stainless steel remains resistant to brittleness at low temperatures and maintains strength at high temperatures. The seat material compensates for thermal expansion and contraction to maintain a tight seal.

Anti-Stem Dislodgement

The stem features an anti-blowout structure, with a mechanical limiting design that secures the stem within the valve body, preventing it from being pushed out by the medium pressure even under high-pressure conditions.

Applications

Instrumentation and Control Systems

Used for opening and closing control of small-diameter process pipelines and for instrument sampling isolation.
Chemical and Fine Chemicals

Used for low-flow shut-off and maintenance of corrosive or general media in detachable applications.
Water Treatment Equipment

Used for fluid control and local isolation of internal piping within equipment.
General Industrial Piping

Used for small-diameter transport and control systems for gaseous or liquid media.

FAQ

Q: What is the difference between a three-piece and a two-piece valve?

A: A three-piece valve allows for independent disassembly of the central valve body without affecting the piping at both ends; a two-piece valve requires complete valve removal for internal structure maintenance.

Q: Is it suitable for high-pressure applications?

A: Small-diameter models can reach 1000–2000 WOG or PN40 ratings, but this needs to be verified based on the connection method (threaded/welded) and the medium temperature.

Q: Is pipe disassembly required for maintenance?

A: No, simply remove the central bolt structure to remove the ball and sealing assembly, leaving the piping ends connected in their original positions.

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