Circle Seal Controls

CIRCLE SEAL 安全阀R6000 Series

提供低、中、高和超高压力型号，R6000 直角泄压阀门为用户提供高精度和开裂和复位压力的一致性。
此外，压力范围（开启压力）为每个模型可以工厂根据客户预设规格。 
PED认证和CE
标记是所有型号的标准。
全部 R6000安全阀提供多端连接以确保应用程序的多功能性。

特征
Low Pressure (5 – 550 psig)*
Zero friction poppets
• Increases accuracy of cracking pressure and reseat
pressure.
• Improves consistency of cracking pressure and reseat
pressure.
Encapsulated Seat Seal
• Maintains small contact surface area.
• Protects seat from erosion due to flow.
Raised seal lip on poppet minimizes contact with seat,
eliminating friction and preventing overstressing of the
O-ring
6 pressure spring ranges improve accuracy
Caps and bonnets are pre-drilled for lockwire
Multiple end connections available


High Pressure (150–6000 psig)
3 models available:
• Medium (150–2500 psig)—6 spring ranges improve
accuracy
• High (150–5000 psig)—7 spring ranges improve accuracy
• Extra High (5000–6000 psig)—one spring
Delta stem seal design prevents friction which increases
accuracy of cracking pressure and reseat pressure.
Balanced poppet design allows cracking pressure to
stay the same regardless of backup pressure.
Orifice sizes: 0.082”, 0.094”, 0.188”
Multiple end connections available.
Optional manual override handle

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CIRCLE SEAL 安全阀5300 Series

Relief Valves
400 to 10,500 psig (28 – 724 bar)

特征
Zero leakage up to 95% of cracking pressure
No chatter or squeal
Positive reseal at a high percentage of cracking pressure
No pressure rise with increasing flow
Externally adjustable
PED certifications and CE marking available for most models

技术数据
Body Construction Materials Brass, 303 or 316 stainless steel
O-ring Materials Buna N, neoprene, and Viton®
Poppet Materials • Liquid service: CRES 440C
• Gas service to 3074 psi: PCTFE
• Gas service above 3074 psi: Polyimide (Vespel®)
Retainer Stem 303 stainless steel
Seat Material 17-4 PH stainless steel
Spring Material 17-7 PH stainless steel
Backup Rings Teflon®
Operating Pressure 400 to 10,500 psig (28 to 724 bar); specify cracking
pressure
Proof Pressure • Gas: 4500 psig (PCTFE); 10,500 psig (Polyimide)
• Liquid: 16,000 psig
Burst Pressure • Brass: over 30,000 psig (2068 bar)
• Stainless steel: over 40,000 psig (2758 bar)
Temperature Range −65° F to +350° F (−54° C to +177° F)
Based on O-ring & body material, see “How to Order”
Connection Sizes • ¼˝ to ½˝ female pipe
• ¼˝ to 1˝ female tube
Note: Proper filtration is recommended to prevent damage to sealing surfaces.

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CIRCLE SEAL 安全阀HP500 Series

高压和Inline Relief Valves
150 至 575 psig (10 – 40 bar)

特征
Very accurate cracking pressure
Zero leakage up to 95% of cracking pressure
100% seat leakage tested
Tamper-proof adjustment
PED certifications and CE marking available for most models
Applications
• System overpressure protection
• Storage tanks
• Freon® recovery systems
• Medical equipment
• Refrigeration & heating equipment
• Measuring & dispensing pumps
• Communications equipment
• Process control instruments
• R & D pilot plants

技术数据：
Body Construction Materials Brass, 316 stainless steel
O-ring Materials Buna N, ethylene propylene, neoprene, silicone,
and Viton®
Spring Material 17-7 PH stainless steel
Poppet Brass, 316 stainless steel
Shroud Brass, 316 stainless steel
Operating Pressure • ¼˝ pipe: 150 to 575 psig (10 to 40 bar)
• ½˝ pipe: 150 to 450 psig (10 to 31 bar)
Temperature Range −65° F to +350° F (−54° C to +177° C)
Based on O-ring & body material, see “How to Order”
Connection Sizes ¼˝ to ½˝ male and female pipe
Note: Proper filtration is recommended to prevent damage to sealing surfaces.

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CIRCLE SEAL 安全阀L500 Series

低压安全阀 0.2–15 psig

产品特征：
Accurate cracking pressure
Eliminates sticking
In-line or vent to atmosphere with deflector cap
Adjustable cracking pressure
Zero leakage
Optional factory preset


技术数据：
Body Construction Materials Brass, 316 stainless steel
O-ring Materials Buna N, ethylene propylene, Kalrez®, neoprene, silicone, Viton®
Spring Materials 302 stainless steel
Cracking Pressure .2 psig to 15 psig
Operating Pressure 0 to 25 psig (1.72 BAR)
Inline Valve Proof Pressure 37.5 psig (2.59 BAR)
Inline Valve Burst Pressure Above 100 psig (6.89 BAR)
Temperature Range -70° F to +550° F (-57° C to +288° C)
Connection Sizes ¼” to ½”
Orifice Size 0.281˝

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CIRCLE SEAL 截止阀9400 Series

特征：
• Leak-proof shutoff
• No stem leakage
• Minimum pressure drop
• Color-coded handles
• Eff ortless opening & closing
• Knob or toggle handle
• Panel mount
• Metering stem
• Compact size
• Pipe and instrument tube fi ttings


技术数据：
Body Construction Materials Brass or 316 stainless steel
Seat Materials Buna N, Neoprene, PTFE or Viton®
Operating Pressure 0 to 3000 psig (207 bar)
Proof Pressure 0 to 4500 psig (310 bar)
Burst Pressure Over 12,000 psig (828 bar)
Temperature Range −80° F to +350° F (−62° C to +177° C)
Based on o-ring material, see “How to Order”.
Connection Sizes 1⁄8˝–3⁄8˝

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CIRCLE SEAL 截止阀9300 Series

特征：
• Leakproof in vacuum or pressure service
• No stem leakage
• Minimum pressure drop
• Very low turning torque
• Eff ortless, fi ngertip operation
• Can be used for throttling service
• Positive position indication



技术数据：
Body Construction Materials Brass
O-ring Materials Buna N, Neoprene or Viton®
Operating Pressures Vacuum to 150 psig (10 bar)
Proof Pressure 300 psig (21 bar)
Burst Pressure (Minimum) Over 500 psig (34 bar)
Temperature Range 0° F to +400° F (−17.8° C to +204° C)
Based on o-ring material, see “How to Order”.
Connection Sizes ¼˝, ½˝
Flow Passage 0.275˝ diameter
Leakage Zero—internal and external

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CIRCLE SEAL 截止阀9200 Series

特征
• 真空或压力服务中的防漏
• 无阀杆泄漏
• Minimum pressure drop/straight through fl ow passage
• 方便的球柄
• 极低的转动扭矩
• 正位置指示


技术数据：
Body Construction Materials Brass, 303 and 316 stainless steel
O-ring Materials Buna N, Neoprene or Viton®
Operating Pressures • Vacuum to 150 psig (10 bar)
• 20 psig (1.38 bar) max in reverse fl ow
Proof Pressure 300 psig (21 bar)
Burst Pressure (Minimum) Over 500 psig (34 bar)
Temperature Range 0° F to +400° F (−17.8° C to +204° C)
Based on o-ring material, see “How to Order”.
Connection Sizes 1⁄8˝–1˝
Leakage Zero—internal and external
Note: Proper fi ltration is recommended to prevent damage to sealing surface

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CIRCLE SEAL截止阀900 Series

特征
• 零泄漏
• 受保护的 O 形圈
• 全流通道
• 无需拉丝
• 面板安装标准
• 手轮或拨动手柄



技术数据：
阀体材质：316 or 303 stainless steel
Stem Materials 316, 303 or 17-4 PH stainless steel
Gland Nut Materials Brass or 17-4 PH stainless steel
O-ring Materials Buna N, Neoprene or Viton®
Spring Material 302 stainless steel
Handle Materials • Handle wheel: die-cast zinc, color blue
• Toggle: forged steel, cadmium-plated
Leakage • Internal: zero
• External: zero
Operating Pressure 0–6000 psig (414 bar)
Proof Pressure 9000 psig (621 bar)
Burst Pressure Over 24,000 psig (1,655 bar)
Temperature Range −40° F to +350° F (−40° C to +177° C)
Based on o-ring material, see “How to Order”.
Connection Sizes ¼˝–3⁄8˝
Actuating Force • 900 Series: 20in/lbs
• T900 Series: 20 lbs
Note: Proper fi ltration is recommended to prevent damage to sealing surface.

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